ASE A1 (Engine Repair) Practice Test - Cumulative
A55. A says that compression rings should never be installed by spiraling them onto the piston. B says that the top compression ring should always be installed on the piston first A B Both Neither
A only ~compression rings should never be installed by spiraling them onto the piston. -the oil rings should be installed first, then the second compression ring, then the top compression ring
A82. an engine equipped with electronic fuel injection has a loose exhaust manifold. A says that a loose manifold may cause noisy engine operation. B says that the loose manifold may cause poor vehicle driveability A B Both Neither
Both on an engine equipped with electronic fuel injection, a loose intake manifold may cause both engine noise and poor vehicle drivability
A54. A says that some engines are fitted with an oil pump that slides over the crank snout and bolts to the front of the block. B says that some engines are fitted with a pump that is driven by the timing belt A B Both Neither
Both some engines are fitted with a type of oil pump that fits over the crank snout. others, especially ohc belt-timed engines, have a belt-driven pump
A87. A says that an engine oil cooler can be located inside one of the radiator tanks. B says that an engine oil cooler can be mounted ahead of the radiator support A B Both Neither
Both two common engine oil cooler mounting locations are: inside a radiator tank and ahead of the radiator support
20. tech A says metal burrs on the crank flange may cause excessive wear on the ring gear and starter drive gear teeth. tech B says metal burrs on the crank flange may cause improper torque converter-to-transmission alignment. A B Both Neither
Both ~Burrs on the crankshaft flange might prevent the flywheel or flexplate from seating properly. During engine operation, this will cause the flywheel or flexplate to wobble, damaging the flywheel and starter gear teeth (during cranking) and the transmission torque converter bushing.
A62. A says that flywheel runout is checked using a dial indicator while the flywheel is still mounted on the crankshaft. B says that flywheel runout is checked using a dial indicator and stand after removing the flywheel from the engine and placing it on a surface plate A B Both Neither
A only ~flywheel runout should be checked with the flywheel mounted on the crank and the dial indicator mounted on the block or clutch so that it contacts the flywheel wear surface
A120. A says that a damaged starter ring gear on a manual transmission flywheel can usually be replaced. B says that a damaged starter ring gear on an automatic transmission flywheel can usually be replaced A B Both Neither
A only ~if the starter ring gear on an auto tranny flywheel is damaged, the flywheel/ring gear assembly must usually be replaced.
36. A says that many thermostats are marked to indicate which way the coolant should flow through them. B says a thermostat that is not marked to indicate direction should be installed so that the thermal element is pointed toward the radiator A B Both Neither
A only. many thermostats are marked to indicate which way the coolant should flow through them. also the thermostat should be installed so that the thermal element points toward the ENGINE (not the radiator)
31. Tech A says worn valve lock grooves may cause the valve locks to fly out of place with the engine running, resulting in severe engine damage. Tech B says worn valve lock grooves may cause a clicking noise with the engine idling A B Both Neither
A only. worn valve lock grooves may cause the valve locks to fly out of place with the engine running, resulting in severe engine damage, but will not cause a clicking noise.
59. oil is leaking from the crankshaft rear main bearing seal on an engine. Tech A says the oil seal could be faulty. Tech B says the PCV system may not be functioning. A B A & B Neither
A&B
A118. a tech has added fluorescent dye to an engine crankcase in order to locate an oil leak. The dye will glow when it is exposed to: a fluorescent light an ultraviolet light a strobe light an infrared light
An ultraviolet light -All others won't cause the dye to glow
54. while discussing basic diagnostic procedures, Tech A says the most complicated diagnostic tests should be performed first. Tech B says that you should first question the customer to obtain as much info as possible about the problem A B A & B Neither
B Always attempt the more simple diagnosis first
29. Tech A says worn valve stem seals may cause rapid valve stem and guide wear. Tech B says worn valve stem seals may cause excessive oil consumption A B Both Neither
B only -worn valve stem seals generally do not cause stem or guide wear, but may cause excessive oil consumption
A45. when deciding on which sealer to use, A says RTV sealant dries in the presence of air by expelling moisture into the air. B says anaerobic sealer dries in the absence of air A B Both Neither
B only RTV sealant dries in the presence of air by ABSORBING moisture from the air and anaerobic sealer dries in the ABSENCE of air
32. While adjusting mechanical valve lifters, Tech A says when the valve clearance is checked on a cylinder, the piston in that cylinder should at TDC on the exhaust stroke. Tech B says some mechanical valve lifters have removable shim pads available in various thicknesses to provide the proper valve clearance A B Both Neither
B only The piston must be at TDC on the compression stroke.
A1. Tech A says valve guide height is measured from the bottom of the valve guide to the top of the valve guide. Tech B says increased oil consumption may result from excessive valve stem-to-guide clearance A B Both Neither
B only Valve guide height is measured from the top of the spring seat to the top of the valve guide and excessive valve stem-to-guide clearance can result in increased oil consumption
42. Tech A says hydraulic valve lifter bottoms should be flat or concave. Tech B says a sticking lifter plunger may cause a burned exhaust valve A B Both Neither
B only a stick lifter plunger may cause a burned exhaust valve, but hydraulic valve lifter bottoms should be convex.
A116. A says that when installing an intake manifold that uses synthetic rubber seals at the front and rear ends, the top and bottom of the rubber seals should be coated with silicone sealer. B says that only a dab of silicone sealer should be placed at the very ends of the seals A B Both Neither
B only coating both sides of the rubber seals increases the likelihood that the seals will be squeezed out of place when the intake manifold bolts are tightened.
A46. an electric drive cooling fan circuit is shown. A says if the coolant temp sensor switch is stuck closed, the cooling fan will stop when the ignition is turned off. B says when the A/C is turned on, the fan relay winding will be grounded through the condenser switch to activate the cooling fan A B Both Neither
B only if the switch is stuck closed, the fan motor will continue to run because the relay receives voltage directly from the battery. also, when the a/c is turned on, the fan relay winding will be grounded through the condenser switch to activate the cooling fan
A18. A says that replacing a 180 degrees F thermostat with a 195 degrees F thermostat will cause the engine to warm up faster. B says that removing the thermostat from an engine may cause "hot spots" to develop in the engine A B Both Neither
B only installing a higher rated thermostat will not cause the engine to warm up faster but will only cause the engine to operate at a higher temp
A109. tech A says that when removing a cylinder head from an OHC engine, the timing belt or chain will have to be removed from the block. tech B says if the timing belt is to be reused, mark its direction of rotation and match it during reassembly
B only on OHC engines, the timing belt or chain does not have to be removed from the block before the head can be removed. In many cases, the cam sprocket is disconnected from the cam and head is lifted from the engine, leaving the belt or chain in place
A17. a starter is being installed in a vehicle. A says that all starters require shims to be installed. B says that measurements must be taken to determine the need for shims on certain vehicles only A B Both Neither
B only shims are not required for all starter but measurements should be taken to determine shim need.
27. A says that if the cooling system pressure is reduced, the coolant boiling point is increased. B says when more antifreeze is added to the coolant (up to an 80/20 mix), the coolant boiling point is increased A B Both Neither
B only the coolant boiling point rises as the pressure is increased
A102. A says that filling a vehicle's cooling system with pure coolant provides the maximum protection against freezing. B says that pure water absorbs heat better than pure coolant A B Both Neither
B only the freezing point of a coolant/water mixture starts to increase when coolant is more than 70% of the mixture
A112. tech A says that positive type valve stem seals must be installed before the valves are installed in the cylinder head. tech B says that positive type valve stem seals must be pushed down firmly over the top of the valve guides A B Both Neither
B only the seals are installed after the valves are installed
A94. tech A says that valve rotators should be disassembled and cleaned during an engine overhaul. tech B says that a rotator causing the valve to rotate in either direction is functioning properly A B Both Neither
B only valve rotators cannot be disassembled
A16. A says that piston ring grooves should be cleaned using a file. B says to position a feeler gauge between each ring and the ring groove to measure the ring groove clearance A B Both Neither
B only ~Ring grooves should be cleaned using a ring groove cleaning tool. Also, to measure ring groove clearance, position a feeler gauge between each ring and ring groove
A35. A says thermal cleaners heat parts from 1,000 to 1,500 degrees (Fahrenheit) to oxidize the contaminants. B says aluminum parts can be cleaned in thermal cleaners without damage A B Both Neither
B only Thermal cleaners heat parts from 650-800. Also, aluminum parts can be cleaned in thermal cleaners without damage.
A105. in a figure, tech A says the tool is being used to check combustion chamber volume. tech B says the tool is being used to check valve stem installed height A B Both Neither
B only the tool cannot check chamber volume
A95. A says that a press-fit harmonic balancer should be removed using a three-jaw gear puller. B says that a harmonic balancer with a damaged keyway should be replaced A B Both Neither
B only ~a press-fit harmonic balancer should be removed using a special balancer remove/install tool
12. measurement B in the figure is more than specified. Tech A says this problem may bottom the lifter plunger. Tech B says a shim should be installed under the valve spring. A B Both Neither
B only Measure the installed valve spring height from the lower edge of the top retainer to the spring seat. Tech A is wrong. Excessive installed valve spring height will not cause the lifter plunger to bottom. Excessive installed valve spring height reduces valve spring tension, which may result in valve float and cylinder misfiring at higher speeds. Tech B is correct because is the measurement is excessive, install shims between the bottom of the valve spring and the top of the spring seat surface on the cylinder head.
44. an OHC cylinder head is being inspected and the feeler gauge is 0.014 inch thick. Tech A says the head should be resurfaced and reinstalled. Tech B says the warpage on the cam side must be measured to determine if the head is usable A B Both Neither
B only. Warpage on the cam side of the head must be measured before determining whether or not the head can be resurfaced and reused.
A13. a new starter motor has been installed on an engine and the tech installed the original shim between the starter and the block. when the engine is cranked, a loud whining noise is heard. A says that there is too little clearance, B says too much clearance A B Both Neither
B only. excessive clearance between the starter pinion gear and flywheel ring gear may cause a loud whining noise
51. while discussing torque-to-yield head bolts, Tech A says compared to conventional head bolts, torque-to-yield bolts provide a more uniform clamping force. Tech B says torque-to-yield bolts are tightened to a specific torque-to-yield bolts are tightened to a specific torque and then rotated tight a certain number of degrees. A B Both Neither
Both
A98. as seen in the figure, a valve seat has been found to be cracked. tech A says valve seat inserts may be removable. tech B says a valve seat insert should be staked after installation A B Both Neither
Both
17. when measuring valve stem-to-guide clearance, Tech A says the valve stems and guides should be measure at 3 vertical locations. Tech B says the valve guide diameter should be measured with either a hole or snap gauge A B Both Neither
Both -When measuring valve stem-to-guide clearance, stem diameter and guide diameter should be measured at three vertical locations (-near the top of the guide -the middle of the guide -the bottom of the guide) Either a hole or a snap gauge can be used to measure the guide diameter
A31. Tech A says X can be replaced without removing the head, while Tech B says Y can. A B Both Neither
Both -both valve spring and valve stem seal can be replaced without removing the head from the engine
3. tech A says a special puller and installer tool is required to remove and install the vibration damper. tech B says if the inertia ring on the vibration damper is loose, the damper must be replaced A B Both Neither
Both A special puller and installer tool are required to remove and install the vibration damper. Using a regular gear puller to remove the vibration damper will damage the damper. Also, a loose inertia ring on the damper requires replacement of the damper.
A111. Tech A says blue-gray smoke coming from the exhaust may be caused by stuck piston rings. Tech B says this could be caused by a plugged oil drain passage in the cylinder head... A B Both Neither
Both Both stuck piston rings and a plugged oil drain passage may allow oil to enter the cylinder and emit a blue/gray smoke when burned in the chamber
62. Tech A says removable valve seat inserts may be removed with a special puller or a pry bar. Tech B says a special driver is used to install the valve seat insert, and the insert should be staked after installation A B Both Neither
Both Removable valve seat inserts may be removed with a special puller or pry bat. Also, a special drive is used to install a new valve seat insert and the insert should be staked in place.
A40. A cylinder block has just been hot tanked and is ready for inspection. A says the block deck should be checked for warpage using a straightedge and a feeler gauge. B says minor nicks or burns on the block deck can be removed using a whetstone or a file A B Both Neither
Both The block deck is check for warpage using a straightedge and a feeler gauge. Minor nicks or burns on the block deck can be removed using a whetstone or a file
28. A says a defective water pump bearing may cause a growling noise when the engine is idling. B says the water pump bearing may be ruined by coolant leaking past the pump seal A B Both Neither
Both a defective water pump bearing may cause a growling noise when the engine is idling and the water pump bearing may be ruined by coolant leaking past the pump seal
A77. A says an exhaust manifold heat control valve stuck in the closed position causes a loss of engine power. B says an exhaust manifold heat control valve stuck in open position may cause an acceleration stumble A B Both Neither
Both a manifold heat control valve that is stuck closed may reduce engine power output and may cause acceleration stumble
A9. A says that a noisy water pump could be caused by a corroded bearing. B says that this could be cause by a defective seal A B Both Neither
Both a noisy water pump could be caused by a corroded bearing and also by a defective seal
15. tech A says a warped cylinder head mounting surface on a block may cause valve seat distortion. tech B says a warped cylinder head mounting surface a block may cause coolant and combustion leaks A B Both Neither
Both a warped head mounting surface on an engine block may cause valve seat distortion. Also, it may cause coolant and combustion leaks.
A103. tech A says after valve seats are resurfaced, install blue dye on the valve face and install the valve against the seat. tech B says when the blue dye does not appear 360 degrees around the valve face, replace the valve A B Both Neither
Both after valve seats are resurfaced, the valve faces should be coated with blue dye and the valves should be installed in the head. if blue dye does not transfer to the head all the way around the seat, replace the valve because it is bent or improperly ground
A89. A says that air trapped in the cooling system can cause overheating and a cracked cylinder head. B says on some engines you can unscrew the coolant temp sender to bleed the air out of the system A B Both Neither
Both air trapped in the cooling system can cause engine overheating and a cracked cylinder head. also, on some engines, trapped air can be released by unscrewing the coolant temp sender.
A10. an electric cooling fan is inoperative. A says that this could be caused by a bad ground in the cooling fan circuit. B says this could be caused by a bad wire to the fan relay A B Both Neither
Both an inoperative electric cooling fan could be caused by a bad ground in the cooling fan circuit and also by a bad wire to the fan relay
A23. A says that an overtensioned V-belt can damage the alternator front bearing. B says an overtensioned V-belt can cause the upper half of the crank front main bearing to wear prematurely A B Both Neither
Both an overtensioned v-belt can damage an alternator front bearing and can also cause the upper half of the crank front main bearing to wear permanently
A68. in the figure, A says noise may be present if this check is not within spec. B says premature bearing wear could result if this check is not within spec A B Both Neither
Both ~if crank end play is excessive, a "clunk" noise may occur when the vehicle accelerates from a stop. Also, excessive back-and-forth motion of the crank may cause rod and main bearings to wear out permanently
13. Tech A says that stuck valves may cause bent pushrods. Tech B says that improper valve timing may cause bent pushrods A B Both Neither
Both -Stuck valves may cause bent pushrods. Improper valve timing may also cause bent pushrods.
40. during a cylinder balance test on an engine with fuel injection, one cylinder provides very little rpm drop. Tech A says the ignition system may be misfiring on that cylinder. Tech B says the engine may have an intake manifold vacuum leak. A only B only Both A & B Neither A nor B
Both A&B Both a misfiring ignition system and an intake manifold leak could cause a cylinder to contribute too little power
A37. all lifters in an engine are cupped (concave). Tech A says replace the cam. Tech B says replace the lifters A B Both Neither
Both. Lifters should be convex. If they are all cupped, the cam and lifters should be replaced
A3. an engine is being disassembled after spinning a rod bearing. A says to flush the oil passages in the head and block. B says to replace the oil cooler A B Both Neither
Both. it is especially important to thoroughly clean engine oil passages after bearing failure. it is also important that other parts of the lubrication system which may contain metal particles be replaced to prevent future engine damage
A6. A says room temperature vulcanizing (RTV) sealant is used to secure threaded fasteners. B says that fumes from an anaerobic sealant can damage an o2 sensor A B Both Neither
Neither -RTV sealant is never used on threaded fasteners -Anaerobic sealant fumes will not harm an O2 sensor
47. A says that a soft or gummy heater hose may be caused by a missing exhaust manifold heat shield. B says that a brittle or hard lower radiator hose may be caused by engine oil leaking onto the hose A B Both Neither
Neither -excessive heat will cause a heater hose to become hard and brittle -engine oil will cause a radiator hose to become soft and gummy
A11. A says that the mechanical advance weights in a distributor cause the pickup or breaker plate to rotate in a direction opposite that of distributor shaft rotation. B says that the vacuum advance rotates the distributor cam or reluctor in a direction opposite that of distributor shaft rotation. A B Both Neither
Neither -the mechanical advance weights rotate the cam or reluctor in the direction of distributor shaft rotation. -the vacuum advance rotates the pickup or breaker plate in a direction opposite that of distributor shaft rotation
A83. a thermostat-testing setup is shown in the figure. A says the thermostat will start to open when the water boils. B says the thermostat valve should be fully open when the temp equals the rated temp stamped on the thermostat A B Both Neither
Neither -the thermostat should be fully open long before the water starts to boil -the thermostat should start to open when the water temperature reaches its rated temperature
A48. tech A says that if a vehicle uses unleaded gasoline, an interference angle must be used on the valves. tech B says an interference angle creates a poor seal when the engine is first starter after reconditioning valves A B Both Neither
Neither -the use of unleaded fuel has nothing to do with interference angles -an interference angle will not result in a poor seal
A72. a timing chain and sprockets are being install in an OHV pushrod engine. Tech A says the cam and crank should be rotated so the chain and sprockets can be installed with the marks on both sprockets pointing straight up. Tech B says the cam and crank should be rotated so the chain and sprockets can be installed with the mark pointing straight down A B Both Neither
Neither the cam and crank must be rotated so that the chain and sprockets can be installed with the marks pointing inward, towards each other
22. tech A says the timing cover must be removed in order to replace the crank front oil seal. tech B says the lip on the front oil seal must face toward the crank pulley or harmonic balancer A B Both Neither
Neither ~on some engines, the crank front oil seal can be replaced without removing the timing cover. Also, lip type seals are installed with the lip of the seal facing the fluid being sealed.
A65. the figure shows the cylinder and ring ridge. if the amount of cylinder wear does not require cylinder reboring, A says the ring ridge at the top of each cylinder can be removed with 400g sand paper. B says the ring ridge at the top of each cylinder can be removed with a 200g bead hone A B Both Neither
Neither ~A ridge reamer should be used to remove the ridge
A34. A says that balance shafts always rotate at crank speed. B says that balance shafts are found only on V4 engines A B Both Neither
Neither. Although balance shafts are timed to the crank, some rotate at twice the speed of the crankshaft and are also commonly found on V4 and V6 engines
A50. A says that stretched main bearing bores can be correct by filing the main bearing caps. B says this problem can be corrected by replacing the main bearing caps A B Both Neither
Neither. Stretched main bearing bores cannot be corrected
A33. A says that when installing cam bearings in the cylinder block, each bearing must be driven into its bore until the front edge of the bearing is flush with the front edge of the bore. B says that the rear edge of each bearing must be flush with the rear edge of the bore A B Both Neither
Neither. The bearings need to be positioned to align the oil hole in the bearing with the oil supply passage in the bore
16. while discussing heli-coil installation, tech A says the 1st step is to use a tap and thread the opening to match the external threads on the heli-coil. tech B says the heli-coil should be installed with the proper size drill bit. A B Both Neither
Neither. ~if the threads in a bolthole are damaged, the first step is to drill the hole over-size. the hole is then re-threaded with a tap provided with the repair kit. then, a thread repair insert (heli-coil) can be installed into the oversize hole. -- A heli-coil is not installed with a drill
A36. a cylinder balance test is being performed on an engine to determine which cylinder is causing a miss. Tech A says that when the faulty cylinder is disabled, engine rpm will drop more than for the other cylinders. Tech B says disabling the faulty cylinder will cause the engine to stall A B Both Neither
Neither the faulty cylinder will not cause the engine to stall, neither will it cause the engine to drop in RPM since it is faulty.
A20. In the figuure, Tech A says that a three-angle valve job is shown. Tech B says that poor valve face to valve seat orientation is shown. A B Both Neither
Neither this is not a 3 angle valve job, and not poor contact (contact shown is correct).
A115. A says too much turbo boost can result in a damaged wastegate diaphragm. B says too much turbo boost can result in bent compressor wheel blades A B Both Neither
Neither too much turbo boost will not cause either
A8. A says that balance shafts should be checked for runout following the same procedure used for measuring cam runout. B says that balance shaft journals should be measured for taper following the same procedure used for measuring crank journal taper A B Both Neither
Both balance shafts should be checked for runout following the same procedure used for measuring cam runout. Balance shaft journals should be checked for taper following the same procedure used to check crank journals for taper.
33. when measuring main bearing bores, provided the vertical reading is not largest, out-of-round measurements are acceptable if less than: 0.001 inch 0.010 inch 0.005 inch 0.015 inch
0.001 inch all others exceed spec
A91. a tech is using a dial indicator to measure valve-to-guide clearance. when the valve head is moved from side to side, the dial indicator shows a maximum value of 0.004 inch. this means the valve guide clearance is 0.001 inch 0.002 inch 0.004 inch 0.008 inch
0.002 valve guide clearance is found dividing the measurement by 2
A41. cylinder warpage in a V4 is not excessive if the feeler gauge is up to 0.004 inch 0.006 inch 0.008 inch 0.012 inch
0.004 inch 0.006 = V6 0.008 = V8 0.012 = V12
A4. A bent valve spring must be replaced if it has a spring height variance of more than 0.005 inch 0.0625 inch 0.125 inch 0.025 inch
0.125 inch 0.125 is beyond spec 0.005, 0.0625, 0.025 is within spec.
A107. even a small oil leak can result in major oil loss. It has been estimated that three drops of oil leaking every 100 feet results in a total of 3 quarts (2.8 liters) of oil loss every 100 miles 500 miles 1500 miles 1000 miles
1000 miles
A71. as shown, a tester pump is being used to pressure test the engine cooling system. How much pressure should be applied to the cooling system when operating a tester pump? 15 psi 17.5 psi 20 psi 22.5 psi
15 psi all others are too high
A38. a battery load or capacity tester, as shown in the figure, is used to test the battery capacity. during this test, the battery is discharged at 1/2 the CCA for 15 sec 20 sec 25 sec 30 sec
15 seconds
A27. the tech is using a torque wrench operated valve spring tester to measure valve spring tension. the tech pulls on the torque wrench until a click or ping is heard. the reading at this point needs to be multiplied by: 2 3 4 5
2 the reading should be multiplied by 2
A74. on turbocharged engines, the lubricating oil is frequently routed through an external oil cooler. the cooler prevents the oil from getting hot enough to oxide and thicken, a process that begins when oil reaches a temp of: 100 degrees F 150 degrees F 200 degrees F 250 degrees F
250 degrees F engine oil begins to oxidize and thicken when it reaches 250 degrees F
A14. with the engine at normal operating temperature, the oil pressure test is usually performed at idle speed and a higher speed such as: 1,500 RPM 2,000 RPM 2,500 RPM 3,000 RPM
2500 RPM
A73. if the specified valve seat angle is 45 degrees, many manufacturers recommend grinding the valve face to: 40 degrees 50 degrees 45.5 degrees 44.5 degrees
44.5 40 is too acute 50 is too obtuse 45.5 is too obtuse
A104. when blowing out an air filter element, how far should the gun be from the inside of the element 5 inches 6 inches 7 inches 8 inches
6 inches
18. in the figure, a thermal cleaner is being used to prepare iron and steel components for inspection. the thermal cleaner heats the parts to: 200-300 degrees 550-700 degrees 700-900 degrees 650-800 degrees
650-800 degrees ~this temp will cause the contaminants to oxidize. after the thermal cleaning process, the ash is removed by shot blasting or washing the parts.
6. when measuring the crankshaft journal (in the figure), the difference between measurements: A & B indicate horizontal taper C & D indicate vertical taper A & C indicate out-of-round A & D indicate out-of-round
A & C indicate out-of-round -A&B indicate vertical taper -C&D indicate horizontal taper -A&D do not indicate out-of-round
30. While measuring valve springs, Tech A says the valve spring must be rotated while measuring squareness. Tech B says that spring squareness can be checked by rolling the spring on a surface plate A B Both Neither
A only -Valve springs must be rotated while measuring squareness. Squareness is not checked by rolling the spring on a surface plate
1. an engine miss is being diagnosed using a cylinder leakage test. Technician A says that any cylinder with over 20% leakage has excessive leakage. Tech B says that air leaking from the tailpipe indicates a cracked cylinder. A only B only Both A & B Neither A nor B
A only If cylinder leakage exceeds 20%, check for air escaping the tailpipe, the PCV valve opening in the rocker arm cover, and the top of the throttle body or carburetor. Air leaking from the tailpipe usually indicates an exhaust valve leak
A114. a cooling system is being checked with a pressure tester. the gauge pressure rises when the engine is started. A says this could be caused by a crack in the combustion chamber. B says this could be caused by clogged tubes in the radiator A B Both Neither
A only a clogged radiator would not cause this
10. A says an intake manifold vacuum leak may cause a cylinder misfire with the engine idling. B says an intake manifold vacuum leak may cause a cylinder misfire during hard acceleration... A B Both Neither
A only an intake manifold vacuum leak at idle may cause a cylinder misfire condition. an intake manifold vacuum leak will not cause a misfire condition during hard acceleration when the vacuum is lower. manifold vacuum is reduced during acceleration. Therefore, the leak would not contribute to cylinder misfire
A123. tech A says that cam lobe lift can be checked with the cam still mounted in the engine. tech B says the cam runout can be checked with the cam still mounted in the engine A B Both Neither
A only cam runout cannot be measured with the cam still mounted in the engine
38. when discussing camshaft bearing clearance, Tech A says excessive camshaft bearing clearance may result in lower-than-spec oil pressure. Tech B says excessive cam bearing clearance may cause a clicking noise when the engine is idling A B Both Neither
A only excessive cam bearing clearance may result in lower than spec oil pressure but not a clicking noise
A100. a gear type oil pump is being cleaned and inspected. A says that gear thickness and backlash are not usually measured; the gears and housing are only inspected for scoring and damage. B says that gear thickness and backlash should always be measured A B Both Neither
A only gear thickness and backlash specs are rarely provided by mfrs. the gears and housing should be inspected for scoring and other damage
53. A says improper balance shaft timing causes severe engine vibrations. B says the balance shafts are timed in relation to the cam A B Both Neither
A only improper balance shaft timing causes severe engine vibrations AND balance shafts are timed to the CRANK; not the cam. Some balance shafts rotate at twice the crank speed, though.
A15. A says that the spark timing adjustment procedures for a vehicle can be found on an underhood label for all cars built since 1972. B says that on any engine with a distributor, spark timing can be adjusted by rotating the distributor with respect to the cylinder block (cylinder head) A B Both Neither
A only spark timing adjustment procedures for a vehicle can be found on an underhood label for all cars built since 1972. But, on some engines equipped with a distributor, ignition timing is not adjustable by rotating the distributor
39. on engines where where the cam drive gear teeth mesh directly with the crank gear teeth, Tech A says the timing gear backlash may be measured with a dial indicator. Tech B says on this type of engine, the timing gear backlash may be measured with a micrometer A B Both Neither
A only timing gear backlash can be measured with a dial indicator, but not with a micrometer
A59. tech A says that valve lock grooves on the valve stems must be inspected for rounded shoulders. tech B says valve stems having rounded or uneven shoulders require machining A B Both Neither
A only valve lock grooves on the valve stems must be inspected for rounded shoulders. Also, rounded or uneven shoulders should be replaced, not machined.
A121. tech A says that carelessly installed valve stem seals may cause excessive oil consumption. tech B says that valve stem seals should be lubricated with grease before the valves are installed A B Both Neither
A only valve stems and valve guides should be lubricated with engine oil prior to assembly
A53. a cylinder block deck is being measured for warpage. A says that if the manufacturer does not provide a warpage limit spec, warpage under 0.005 inch is acceptable. B says if warpage exceeds 0.001 inch the block must be resurfaced A B Both Neither
A only warpage under 0.005 inch is usually acceptable
A75. the oil light on a vehicle stays on while the engine is running. A says this could be caused by too much cam bearing clearance. B says a grounded wire in the oil lamp warning lamp circuit could cause this A B Both Neither
Both excessive cam bearing clearance or a grounded warning indicator circuit could cause the oil pressure light to remain on while the engine is running
A47. tech A says that some head bolts stretch permanently when they are tightened. tech B says some bolts cannot be reused A B Both Neither
Both head bolts do stretch permanently when tightened and some cannot be reused
41. Tech A says improper valve timing may cause reduced engine power. Tech B says improper valve timing may cause bent valves in some engines A B Both Neither
Both improper valve timing may cause reduced engine power and bent valves
A49. when measuring main bearing bores, A says the vertical measurement should not be larger than any of the other. B says out-of-round measurements less than 0.001 inch are acceptable if the vertical reading is not the largest A B Both Neither
Both main bearing bore out-of-round measurements of less than 0.001 inch are acceptable, so long as the vertical measurement is not the largest. the vertical measurement should never be the largest
49. tech A says that when inspecting piston ring grooves for wear, you should place a new rings in the groove and then insert a feeler gauge between the ring and the groove. tech B says that you should simply insert a feeler gauge in the ring groove and then compare the measurement to specification A B Both Neither
A only ~piston ring clearance is measured by placing a new ring in the groove and then inserting a feeler gauge between the ring and groove
A56. the rocker arms on a pushrod engine have 1:5:1 ration. this means that: a cam lift of 0.250 will cause the valve to open 0.188 inch a cam lift of 0.250 will cause the valve to open 0.375 inch the engine must be fitted with hydraulic lifters the engine must be fitted with roller lifters
a cam lift will cause the valve to open 0.375 inch (0.250 x 1.5) the rocker arm ratio does not determine which type of lifters must be used
A88. a tech is testing an upper radiator hose by squeezing it. the most likely cause of cracking or crunching noises would be: a corroded anti-collapse spring low coolant level a deteriorated hose inner liner damage due to contact with power steering fluid
a deteriorated hose inner liner -an anti-collapse spring is found in the lower, not the upper radiator hose -low coolant level will not cause this noise -contact with power steering fluid causes a hose to become soft and gummy
A57. valve face and seat concentricity can be measured with all of the following EXCEPT a concentricity tester a dial caliper blue dye a dial indicator
a dial caliper -all others are useful tools to measure concentricity
A60. most mfrs(manufacturers) recommend that piston diameter be measured at 90 degrees to the wrist pin bore: at the very top of the piston at the wrist pin bore centerline about 3/4 inch below the wrist pin bore centerline about 1/4 inch from the bottom of the piston skirt
about 3/4 inch below the wrist pin bore centerline
A24. air filters should be replaced after every 12,000 miles after every 15,000 miles after every 3,000 miles according to mfrs recommendations
according to mfrs recommendation
A52. the gauge in the figure is being used to check cylinder diameter near the bottom of the cylinder. if the tech wants to determine cylinder taper, where must he take an additional measurement? -at the top of the cylinder, just above the ring ridge -at the top of the cylinder, just below the ring ridge -near the top of the cylinder, at the top of the oil ring contact are -near the bottom of the cylinder, at 90 degrees to the first measurement
at the top of the cylinder, just BELOW the ring ridge
4. while cleaning a pleated paper-type air filter element, the air gun should be held: away from the outside of the air filter element directly against the outside of the air filter element directly against the inside of the air filter element away from the inside of the air filter element
away from the inside of the air filter element ~when cleaning a pleated paper-type air filter element using compressed air, hold the air gun tip about 6 inches from the inside of the filter element -air should be blown from the inside out to remove particles, and air forced into the filter are too short of a distance may damage the filter.
37. the tool in the figure is being used to check the: valve lifter height camshaft journal out-of-round pushrod length camshaft lobe lift
camshaft lobe lift valve lifter height and pushrod length would not be measured in this manner. cam journal out-of-round should be measured with a micrometer.
A28. an electromagnetic-type tester and iron fillings may be used to check for cracks in: aluminum heads pistons cast-iron heads aluminum intake manifolds
cast-iron heads -a dye penetrant must be used on aluminum heads and aluminum intake manifolds -this type of tester is not used on pistons
A67. when installing a piston/connecting rod into the cylinder block, which of the following steps is a tech LEAST LIKELY to perform? -position the crank journal at BDC -install boots over the rod bolts -make sure the rings are installed right side up -check piston-to-cylinder wall clearance using Plastigage
check piston-to-cylinder wall clearance using Plastigage
A78. all of the following are reasons to replace a hydraulic valve lifter EXCEPT: excessive leak=down convex bottom pitted bottom flat bottom
convex bottom -they should be convex
7. the tester in the figure may be used to test all of the following EXCEPT: cooling system leaks the radiator cap pressure relief valve coolant specific gravity heater core leaks
coolant specific gravity
A81. the customer says that the engine requires excessive cranking to start. the LEAST likely cause of this problem would be: cracked cylinder block jumped timing belt faulty fuel pump stuck-open EGR valve
cracked cylinder block
A124. while replacing a faulty heater core hose, a technician discovers that the hose is stubbornly stuck to the heater core fitting. to remove the hose, he should: -pierce the hose with a screwdriver and try to pull it off the fitting -use a pair of pliers to loosen the hose -pry behind the edge of the hose to loosen it -cut the hose off at the fitting and slit the remaining piece
cut the hose off at the fitting and slit the remaining piece
25. the LEAST likely place an RTV sealer would be used is the: oil pan valve cover intake manifold cylinder head
cylinder head
26. a collapsed cooling system hose may be an indication of a: damaged radiator cap sealing gasket damaged radiator filler neck seat damaged expansion tank damaged radiator cap vacuum valve
damaged radiator cap vacuum valve
A110. if the starter motor does not crank the engine, the first diagnostic step a tech should take is: disable the ignition system remove the spark plugs rotate the engine by hand watch for oil or coolant flow from spark plug holes
disable the ignition system -ignition first, rotate (if possible), then remove spark plugs to rotate and check for coolant or oil
24. in the figure, an open ground circuit on the engine temperature sensor switch may cause: continual cooling fan motor operation a completely inoperative cooling fan motor a burned-out cooling fan motor engine overheating
engine overheating -an open in the ground circuit of the engine temp sensor will prevent the cooling fan from operating when the condenser switch is open. this may cause engine overheating -the cooling fan motor would only operate when the condenser switch is closed
A117. the LEAST LIKELY cause of cam bind would be excessive runout improperly installed cam bearing bore misalignment excessive bearing clearance
excessive bearing clearance excessive runout, improperly install cam bearings, and bore misalignment would cause cam binding.
A21. after a vehicle is parked overnight and then started in the morning, the engine has a lifter noise that disappears after running for a short time. this may be caused by: low oil pressure low oil level worn lifter bottom excessive lifter leak-down
excessive lifter leak-down low oil pressure would result in a continuous noise low oil level would result in a continuous noise worn lifter bottom would result in a continuous noise
A30. which of the following would LEAST LIKELY require crank grinding? excessive taper an out-of-round journal excessive journal scoring excessive thrust wear
excessive thrust wear all others may require crank grinding
A93. a cylinder balance test on a carbureted engine has revealed one cylinder is contributing less power than the others. The LEAST likely cause of this is: faulty ignition system burned exhaust valve faulty carburetor leaking intake manifold
faulty carburetor -faulty ignition system, burned exhaust valve, and leaking intake manifold are likely to cause one cylinder to provide less power than others. The carburetor would not cause one single cylinder to contribute less power.
A58. the areas around the mounting holes on a sheet metal rocker cover are dished from having fasteners overtightened. to prevent oil leaks from occurring when the rocker cover is installed, the tech should: replace the rocker cover with a new one hammer the dished areas flat again use two gaskets instead of one use RTV sealant instead of a gasket
hammer the dished areas flat again
A44. a defective water pump can be diagnosed by all of the following EXCEPT by: observing residue at the water pump drain hole observing a coolant leak from the water pump hearing a groaning noise at cruising speeds using a pressure tester
hearing a groaning noise at cruising speeds -residue at the water pump drain hole may indicate a damage seal or bearings -coolant leaking from the water pump is a sign of failure -a pressure tester should indicate a water pump leak
2. which of the following steps is the tech LEAST LIKELY to take when pressing the wrist pin into the piston and connecting rod -align the bores in the piston and connecting rod -heat the small end of the rod -make sure that position marks on the piston and connecting rod are oriented properly -heat the wrist pin
heat the wrist pin (heating the wrist pin is the LEAST LIKELY step because it will cause the pin to expand and prevent it from fitting into the connecting rod and piston bores) -the bores in the piston and the rod should be aligned before pressing in the wrist pin -the small end of the rod should be heated before pressing in the wrist pin -position marks on the piston and rod should be oriented properly before pressing in the wrist pin
A64. vibration damper rubber should be inspected for all of the following EXCEPT: hub contact area scoring looseness cracks oil soaking
hub contact area scoring
48. when installing a starter motor, shims may be required by some manufacturers to adjust the gap between the starter pinion gear and flywheel ring gear. adding a 0.015 inch shim between the starter motor and the engine block will: decrease the clearance by 0.005 decrease the clearance by 0.015 increase the clearance by 0.010 increase the clearance by 0.005
increase the clearance by 0.005. ~adding a 0.015 inch shim will increase clearance by 0.05 inch
58. a battery rated at 600 CCA is load tested at 1/2 its rated CCA for 15 seconds. the results show 10.1 volts. the results indicate that this battery: is satisfactory needs recharging is bad and should be replaced should be retested at load for 30 seconds
is satisfactory
A99. a low, steady vacuum gauge reading from 11 to 15 indicates: burned or leaking valves late ignition timing weak valve springs leaking head gasket
late ignition timing -burned or leaking valves cause a fluctuation between 12 and 18 -weak valve springs cause a fluctuation between 10 and 25 -leaking head gasket would cause a fluctuation between 7 and 20
A63. the first step a Tech should take for diagnosis is: think of possible causes of the problem question the customer road test the vehicle listen to the customer
listen to the customer
A84. which of the following is LEAST likely to cause engine noise? loose pistons worn cylinders worn main bearings loose camshaft bearings
loose cam bearings -loose pistons may cause a rapping noise while accel -worn cylinders may cause a rapping noise while accel -worn main bearings may cause a thumping noise when starting
61. a heavy thumping noise occurs with the engine idling, but the oil pressure is normal. this may be caused by: worn pistons and cylinders loose flywheel bolts worm main bearings loose camshaft bearings
loose flywheel bolts -worn pistons and cylinders would cause a thumping noise during acceleration -worn main bearings cause a thump when the engine is started -loose camshaft bearings would cause a growling noise at all times
A119. when installing a timing chain cover, the step that a tech is LEAST LIKELY to take is: making sure the woodruff key is in place making sure the oil slinger is in place making sure the piston in cylinder #1 at TDC making sure the oil seal has been lubricated
making sure the piston in cylinder #1 is at TDC
A86. all of the following are true about torque-to-yield head bolts EXCEPT: -they permanently stretch when they are torqued -they must be torqued in a proper sequence -many older engines have torque-to-yield bolts -torque-to-yield head bolts are usually tightened to a specific torque then rotated tighter
many older engines have torque-to-yield bolts
43. when removing the timing belt from an OHC engine, the tech must first: remove the rocker arm assembly mark the timing belt for position mark the timing belt for direction remove the water pump
mark the timing belt for direction none of the others are necessary
14. all of the following oil pump measurements should be performed with a feeler gauge EXCEPT: -measure pump cover flatness with a feeler gauge positioned between a straightedge and the cover -measure the clearance between the inner rotor and the housing -measure the clearance between the inner and outer rotors with the rotors installed -measure the clearance between the top of the rotors and straightedge positioned across the top of the oil pump
measure the clearance between the INNER ROTOR and the housing ~ oil pump measurement should be performed with a feeler gauge: -measure pump cover flatness with a feeler gauge positioned between a straightedge and the cover -measure the clearance between the OUTER ROTOR and the housing. -measure the clearance between the inner and outer rotors with the rotors installed. -measure the clearance between the top of the rotors and a straightedge positioned across the top of the oil pump
A108. on some engines that use a timing chain hydraulic tensioner, chain stretch can be checked by using a chain tension gauge measuring the feed oil pressure measuring tensioner length rotating the crank backwards by hand while watching the distributor rotor
measuring tensioner length
A39. In the figure (ruler at top of engine and torque wrench on crank), what is being performed adjusting cam timing locating TDC measuring timing chain stretch adjusting valve lash
measuring timing chain stretch -cam timing is not adjusted with a ruler -TDC is not located in this manner -valve lash is not adjusted at the timing chain
45. the hose from the positive crankcase ventilation valve to the intake manifold is restricted. this problem could result in an acceleration stumble oil accumulation in the air cleaner engine surging at high speed engine detonation during acceleration
oil accumulation in the air cleaner - a pcv valve stuck open may casue acceleration stumble -restricted pcv hose would not cause the engine to surge at high speed, nor would it lead to engine detonation
11. an engine oil cooler helps to prevent: oxidation of the engine oil excessive oil pressure oil pump wear main bearing wear
oxidation of the engine oil
5. if new rings are installed without removing the ring ridge, what may be the result? -piston skirt may be damaged -piston pin may be broken -connecting rod bearings may be damaged -piston ring lands and/or top compression ring may crack
piston ring lands and/or top compression ring may crack (failing to remove the ridge ring may cause piston ring lands and/or the top compression ring to crack or break after the engine is assembled and started) -piston skirt & pin would not be damaged -connecting rod bearings would not be affected
A32. the following specific gravity readings were taken from a battery at 80 degrees F. Cell 1: 1.200 |Cell 2: 1:210 |Cell 3: 1.190 |Cell 4: 1.200 Cell 5: 1.205 |Cell 6: 1.200 what action should be taken? load test the battery replace the battery refill the battery with fresh electrolyte recharge the battery
recharge the battery -battery should not load tested since it is discharged. the specific readings do not vary enough between cylinders to warrant battery replacement. the battery should not be refilled with fresh electrolyte; just recharged.
A12. a tech is servicing an OHC engine where the cam runs without bearing in its bore. if cam journal-to-bore clearance exceeds spec, the tech must: replace bearings with oversized bearings replace the cam insert bushings replace the head
replace the head if cam journal-to-bore clearance exceeds spec the cylinder head must be replaced
A70. the figure shows the pcv system. all of the following are symptoms of a stuck open pcv valve EXCEPT: blowby gases in the air filter the engine stalling rough idle operation a lean air/fuel ratio
blowby gases in the air filter
A79. a vehicle is equipped with a coolant recovery system. coolant does not return to the radiator when the engine cools. A says that the transfer hose may be plugged. B says that the filler neck soldered joint could be cracked A B Both Neither
both both a plugged transfer hose and a cracked filler neck soldered joint could prevent coolant from returning to the radiator when the engine cools
52. the tool shown in the figure is used to: remove cam bearings only install cam bearings only measure cam bearing alignment both remove and install cam bearings
both remove and install cam bearings not a tool for taking measurements
A29. in the figure, how is valve lash adjusted? adding shims to point w adding shims to point x no adjustment is required by turning nut z
by turning the adjusting nut (z)
19. all of the following are causes of low engine oil pressure EXCEPT: worn cam bearings worn crank bearings weak oil pressure regulator spring tension restricted pushrod oil passages
restricted pushrod oil passages ~all other may be a cause of low engine oil pressure
A97. an excessive sulfur smell in the exhaust with a cat can be an indication of: lean fuel mixture coolant leaking into combustion chamber rich fuel mixture vacuum leak
rich fuel mixture -lean fuel mixture would not cause a sulfur smell -coolant leaking into the chamber would cause a gray exhaust color -a vacuum leak would cause a rough idle that would decrease as engine speed increases
A51. when checking connecting rods for damage and wear, which of the following is LEAST LIKELY to be checked? rod center-to-center length rod straightness small end bore condition big end bore out-of-round
rod center-to-center length
A66. while examining the old connecting rod bearings from an engine, the tech notices that the bearings from one rod are worn along the parting lines. this means that the tech should check carefully for rod stretch rod twisting rod bending loose wrist pin
rod stretch ~bearings worn along the parting lines indicate rod stretch has occurred
A69. the procedure for aligning cam and crank sprockets before installing a timing chain varies from manufacturer to manufacturer. one step common to most procedures is for the tech to rotate the cam to fully open the in valve in cylinder #1 rotate the cam to fully open the ex valve in cylinder #1 rotate the crank to position piston number 1 at TDC rotate the crank to position piston number 1 at BDC
rotate the crank to position to piston #1 to TDC
A26. a tech is preparing to install new oil galley plugs in a cylinder block. which of these operation is he LEAST LIKELY to perform? run a bottoming tap into the threaded galley bores apply oil resistant sealer to the new plugs apply teflon tape to the threaded plugs run a rifle brush through the gallies
run a bottoming tap into the threaded galley bores -They galley bores already have tapered pipe threads
A96. the measuring tool in the figure is checking the cam journal condition runout lift bearing clearance
runout
60. A high-pitched squealing noise is heard during hard acceleration. This may be the cause of: intake manifold leak the choke stuck closed fuel system leak small leak in exhaust manifold
small leak in exhaust manifold -intake manifold leak causes a high-pitched whistle at idle and low speeds -carb choke stuck closed will not cause a high-pitched whistle -fuel system leak normally would not cause a noise
A25. valve spring installed height is measured between the lower edge of the top retainer and the: cylinder head top edge of the top shim bottom edge of the bottom shim spring seat
spring seat -the cylinder head and the bottom edge of the bottom shim should not be used as a measurement location -measurement should be to the top of the spring seat, not the top shim
A92. the least likely first step in a diagnosis would be to: question the customer for more info be sure that the customer complaint is eliminated start with the most difficult test road test the vehicle
start with the most difficult test
57. with the engine idling, a vacuum gauge connected to the intake manifold fluctuates (from 15 to 20). These fluctuations may be caused by late ignition timing intake manifold vacuum leaks a restricted exhaust system sticky valve stems and guides
sticky valve stems and guides -late ignition timing would result in a low, steady reading -intake manifold leaks would cause a very low, steady reading -a restricted exhaust system would cause vacuum to slowly decrease after the engine was accelerated and held steady
A7. on an OHC engine with removable bearing caps, which of the following is used to measure bearing alignment straightedge plastigauge dial indicator telescoping gauge
straightedge -plastigauge cannot effectively measure bearing alignment. -a dial indicator could not measure bearing alignment -telescoping gauge is not used to measure bearing alignment
A61. a crank journal is being measured in the same direction at opposite ends. this is measuring for: taper out-of-roundness wear bearing size
taper ~crank journal taper is measured in the same direction at opposite ends
A122. while inspecting the intake manifold from a v-type engine, a tech notices a crack in the exhaust gas crossover passage on the underside of the manifold. the most likely cause of this condition is -the intake manifold bolts were overtorqued -the intake manifold bolts were not torqued in the correct sequence -the EGR passage in the manifold is plugged with carbon -the heat riser valve on one of the exhaust manifolds is stuck shut
the heat riser valve on one of the exhaust manifolds is stuck shut ~a stuck shut heat riser valve will force exhaust gases through the underside of the intake manifold at all times, resulting in the manifold overheating and possibly cracking.
A19. if either the radiator pressure cap sealing gasket or the radiator filler neck seat are damaged, which of the following is LEAST likely to occur? the lower radiator hose will burst the engine coolant will boil the engine coolant will overflow the engine will overheat
the lower radiator hose will burst -coolant may boil due to low pressure in the system -coolant may overflow through the damaged seal or gasket -if the pressure gets too low or enough coolant is lost, the engine may overheat
A90. to measure bearing clearance, install a strip of Plastigage across the journal, as shown in the figure, and then tighten the bearing cap to the specified torque. remove the bearing cap and measure the width of the Plastigage on the journal with which of the following? the plastigage package a ruler dial calipers a micrometer
the plastigage package
A113. if threads are damaged, as shown in the figure, the opening may be drilled and threaded, and then a heli-coil may be installed to provide a thread: the same size as the new hole one thread size smaller than the original one thread size larger than the original the same size as the original
the same size as the original
A43. an engine is idling at 750 rpm. the pointer on the vacuum gauge is floating between 11 and 16 in Hg. The most likely cause is retarded timing advanced timing stuch EGR valve too lean idle mixture
too lean idle mixture all others would not result in gauge fluctuation
A101. during a cylinder leakage test using a cylinder leakage tester, the reading exceeds 20%. The least likely place the tech would for leaking air would be: tool air hose vehicle tailpipe radiator filter neck PCV valve opening in the rocker arm cover
tool air hose -leaking exhaust valve would cause air to escape through the tailpipe -a leaking head gasket or cracked head would cause air to escape from the radiator filler neck -worn piston rings would cause air to escape from the opening in the rocker arm cover
A76. a rocker arm assembly on an engine with hydraulic lifters. when adjusting valve lash on this engine while it's running, the step LEAST LIKELY to take by a Tech is: turning the adjusting nut clockwise 1/4 turn at a time turning the adjusting nut clockwise 2 turns at a time turning the adjusting nut counterclockwise until it clicks installing oil shrouds on the rock arm
turning the nut clockwise 2 turns at a time -this would cause the valve and piston to collide, damaging the valve train components
21. a bent connecting rod may cause uneven connecting rod bearing wear uneven main bearing wear uneven piston pin wear excessive cam bearing wear
uneven connecting rod bearing war all others are not causes of a bent connecting rod
A85. serpentine belt stretch is indicated by: using a belt tension gauge belt deflection a squealing noise at idle using the scale on the tensioner housing
using the scale on the tensioner housing -a belt tensioner gauge is used to check tension on standard v-belts -measuring belt deflection on a v-ribbed belt is not the best method -a squealing noise at idle would indicate a loose or worn belt
56. a valve margin of 1/64 inch may cause a clicking noise at idle valve overheating and burning improper valve seating valve seat recession
valve overheating and burning -a margin less than 1/64 inch will not cause a clicking noise. -the angle of the cut, not the margin, affects valve seating -a 1/64 margin would not cause valve seat recession
46. in the figure, the technician is most likely checking: valve guide depth valve seat angle cylinder head flatness valve seat runout
valve seat runout
35. the customer complains that the engine cranks but does not start; the first thing to check should be valve train operation battery voltage compression engine vacuum
valve train operation if the engine cranks properly, the battery is not the problem. Compression would not be the FIRST test, and because engine vacuum is low during a crank, a vacuum test would not be conclusive.
50. reduced turbocharger boost pressure may be caused by a: wastegate valve stuck closed wastegate valve stuck open leaking wastegate diaphragm disconnected wastegate linkage
wastegate valve stuck open all others would INCREASE boost pressure
A5. all of the following could cause a bent pushrod except: worn cam bearings broken timing chain sticking valve improper valve adjustment
worn cam bearings -a broken timing chain, stick valve, or improper valve adjustment could cause a bent pushrod.
A106. during a cylinder leakage test, air comes out of the PCV valve opening in the rocker arm cover. This is an indication of: worn intake valves worn exhaust valves a broken PCV valve worn piston rings
worn piston rings -worn intake valves would cause air leaks at the throttle body or carburetor -worn exhaust valves would cause air to leak at the tailpipe -a broken PCV valve wouldn't cause an air leak
23. during a compression test, a cylinder has 40% of the specified compression reading. When the tech performs a wet test, the compression reading on this cylinder has 75% of the specified reading. The cause of the low compression reading could be worn piston rings a burned exhaust valve a bent intake valve a worn camshaft lobe
worn piston rings if compression increases during a wet test, this indicates worn piston rings. Compression would not increase if an exhaust valve is burned, intake valve is bent, or camshaft lobe is worn.
A22. when using a compression tester, the readings on the cylinders are all even, but lower than spec. this could indicate: blown head gasket carbon buildup cracked head worn rings and cylinders
worn rings and cylinders -a low reading on two adjacent cylinders may indicate a blown head gasket -carbon buildup would cause a high reading -a low reading on two adjacent cylinders may indicate a cracked head
55. the following statements about distributor advances are true EXCEPT: -the vacuum advance controls spark advance in relation to engine load -the mechanical advance controls spark advance in relation to engine speed -the mechanical advance rotates the reluctor in the opposite direction of the shaft rotation -the vacuum advance rotates the pickup plate in the opposite direction to shaft rotation
-the mechanical advance rotates the reluctor in the opposite direction of the shaft rotation
9. all of the following statements regarding manifold heat control valves are true EXCEPT: - a manifold heat control valve improves fuel vaporization in the intake manifold especially when the engine is cold - a manifold heat control valve stuck in the closed position causes a loss of engine power - a manifold heat control valve stuck in the open position may cause an acceleration stumble - a manifold heat control valve stuck in the closed position reduces intake manifold temperature
a manifold heat control valve stuck in the closed position reduces intake manifold temp ~the exhaust manifold on carbureted and throttle body injected engines may be equipped with a manifold heat control valve. if the manifold heat control valve is stuck open or fails to close when the engine is cold, the engine may stumble during acceleration. if the valve is stuck in the closed position, engine power will be reduced and the intake manifold will overheat.
34. when measuring crank end play, it is LEAST LIKELY that a tech would use: a micrometer a pry bar a dial indicator feeler gauges
a micrometer - a pry bar may be used to bottom the crank -a dial indicator and/or feeler gauge may be used to take other measurements
A2. the LEAST LIKELY cause of excessive blue smoke in the exhaust of a turbocharged engine is: a PCV valve stuck in the open position worn turbocharger seals worn valve guide seals worn piston rings
a pcv valve stuck in the open position
8. a moderately loose alternator belt may cause: a discharged battery a squealing noise when accelerating poor power steering assist engine overheating
a squealing noise when accelerating a SEVERELY worn or loose belt may cause a discharged battery, engine overheating, or lack of power steering assist
A80. the LEAST LIKELY cause of an oil saturated pcv filter is: worn piston rings an obstructed pcv vacuum hose a stuck open pcv valve a clogged pcv valve
a stuck open pcv valve
