Engine repair midterm
False Cracked blocks usually must be repaired by a specialized machine shop.
True
True/ False Boring slightly increases engine compression.
True
True/ False Connecting rods and caps must have the same number to prevent possible engine damage.
True
True/ False Crankshaft taper is the amount of side-to-side movement possible in the block.
True
True/ False Cylinder taper is the difference in the diameters measured at the top and bottom of a cylinder.
True
True/ False Damage to a block caused by a spun main bearing can be corrected by line boring.
True
True/ False Engine balancing is needed if larger, heavier pistons have been installed.
True
True/ False Even the smallest nick or scratch in a rod or main journal surface is serious.
True
True/ False Magnafluxing cannot be used to find cracks and pores in aluminum blocks.
True
True/ False Piston pin clearance is measured in ten-thousandths of an inch.
True
True/ False The amount of front-to-rear movement of the crankshaft in the engine block is called endplay.
True
True/ False The engine front cover can be installed with either a gasket or silicone sealer.
True
True/ False The most efficient tool for cleaning an engine block after disassembly is a pressure washer.
True
True/ False The most-stressed fasteners in an engine are the connecting rod bolts.
True
True/ False The sealing lip of a rear main seal must be installed facing the inside of the block.
True
True/ False Timing marks on crankshaft and camshaft sprockets are aligned after the timing chain is installed.
True
True/False A cam-ground piston is slightly out-of-round.
True
True/False A shorted sending unit wire can cause an oil pressure gauge to always read high.
True
True/False A wet sleeve must be thicker than a dry sleeve.
True
True/False An in-vehicle engine overhaul can only be done when cylinder and crankshaft wear are within specifications.
True
True/False An oil slinger uses centrifugal force to lubricate the engine's timing chain.
True
True/False Approximately 20-30% of an engine's power is fost to friction.
True
True/False As the engine heats up, lubricating oil becomes thinner and more "runny."
True
True/False Balancer shafts are also called silencer shafts.
True
True/False Before removal, hood hinges should be marked for proper alignment when reinstalled.
True
True/False During engine disassembly, bolts and parts should be separated by the assembly from which they came.
True
True/False Gasoline should never be used to clean parts, since it can easily be ignited by a spark.
True
True/False High oil pressure is a frequently diagnosed problem.
True
True/False Ifan engine is old, the core plugs should be pried out and new ones installed before reassembly.
True
True/False Ignoring recommended oil and filter change intervals will greatly shorten engine life.
True
True/False Internal oil leakage will show up as blue exhaust smoke.
True
True/False Ring lands are the areas between and above the ring grooves.
True
True/False The primary purpose of the engine front cover is to prevent oil leakage out the front of the engine.
True
True/False Thermal efficiency generally ranges from 30-40%.
True
True/False To take up slack in a timing chain, a tensioner is used.
True
A cast iron, V-6 block is almost new and has very low mileage. However, a piston skirt broke off and scored one cylinder. All of the other pistons and cylinders are in good condition. Technician A says to bore the block oversize and install six new, oversize pistons to correct the cylinder damage. Technician B says to sleeve the damaged cylinder and buy a new piston. Who is right? A. A only. (B B only. C. Both A and B. D. Neither A nor B.
B
B. To produce a textured 25-30 RMS surface texture for cast iron rings operating on cast iron cylinder walls, you should use ______ -grit honing stones. A. 150 B. 220 С. 280 D. 320
B
Cylinder _______ or deglazing, is normally a part of cylinder block service. A. grinding B. honing C. boring D. filing
B
Engine displacement is usually matched to what? A. Engine torque. B) Weight of the vehicle. C. Horsepower of the vehicle. D. Type of fuel pump in the vehicle.
B
Oil will chemically change and form sludge after ______ miles of use. A. 15,000 B. 20,000 C. 35,000 D. 50,000
B
Tests find a burned engine valve. The engine is not smoking and has good oil pressure. Technician A says that the engine must be removed from the vehicle to service the valves. Technician B says that this should be an in-vehicle operation: the block can remain bolted to the chassis. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
The difference between piston ring width and ring groove width determines ______ A. ring gap B. ring side clearance C. ring wall thickness D. ring back clearance
B
The maximum permissible warpage for a block deck is typically ______ A. 0.03"-0.05" B. 0.003"-0.005" C. 0.0003"-0.0005" D. 0.00003" 0.00005"
B
The most common type of cam drive on cam-in-block engines is the timing ______ A. belt B. chain C. reducer D. gear
B
Which of the following methods is used to secure a full-floating piston pin in the piston? A. Cotter pins. B. Snap rings. C. Staking. D. Threaded inserts.
B
A piston head can reach operating temperatures as high as ______ °F. А. 450 B. 500 C. 650 D. 700
C
An oil pump that uses two star-shaped rotors to move and pressurize oil is usually referred to as a ______ pump. A. centrifugal B. lobe C. rotary D. gear
C
Before belt removal, rotate the camshaft until the crankshaft and the camshaft timing marks align with_____ number piston at TDC. A. four B. three C. one D. None of the above.
C
For safety, bolts used to secure a lifting chain to the engine must thread into the hole for a distance that is _____ their thread diameter. A. half B. equal to C 1 1/2 times D. twice
C
Oil pressure should be approximately _______ psi at cruising speeds. A. 15-20 B. 20-30 C) 40-60 D. 70-85
C
Oil should be changed at more frequent intervals when the vehicle is driven _______ A. mostly at highway speeds B. in cold climates (C) mostly for short distances D. in hot, humid climates
C
Technician A says that 0.030" (0.75 mm) is a common oversize to which machine shops bore cylinders. Technician B says that 0.060" (1.5 mm) is a common oversize to which machine shops bore cylinders. Who is right? A. A only. В. В only. C. Both A and B. D. Neither A nor B.
C
Technician A says that the VIN can be used to identify the transmission type. Technician B says that a VIN can be used to identify the engine type. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
C
The ______ is a heavy wheel mounted on a rubber ring and keved to the erankshaft snout. A. dynamic tuner B. oscillation damper C. harmonic balancer D. vibration snubber
C
To hone a cylinder, move the hone up and down in the cylinder fast enough to create a ______ to ______ crosshatch pattern. A. 90°, 95° B. 65°. 70° C. 50°, 60° D. 40°. 50°
C
Which of the items below is a measurement of the usable horsepower at the engine crankshaft? A. Indicated horsepower. B. Net horsepower. C) Brake horsepower. D. Gross horsepower.
C
While discussing oil pump drive methods, Technician A says an oil pump can be driven by a cogged belt. Technician B says an oil pump can be driven by an engine timing gear. Who is right? A. A only. B. B only. C Both A and B. D. Neither A nor B.
C
True/False Removing an oil pan usually requires engine removal, as well.
False
True/False Some contaminant particles are too small to be trapped by the oil filter.
False
True/False Technicians generally rebuild oil pumps, rather than replacing them.
False
True/False The prony brake was the forerunner of today's anti-lock braking systems.
False
True/False The two types of engine bearings are friction and antifriction.
False
True/False Work = distance moved + clapsed time,
False
A customer returned to complain about a smoking problem with the vehicle's newly-rebuilt engine. Technician A says the cause of the problem is the use of rings with hard coatings. Technician B says the problem is caused by incorrect ring side clearance. Who is right? A. A only. В. В only. C. Both A and B D. Neither A nor B
A
Crankshaft straightness can be measured with a(n)______ A. dial indicator B. feeler gauge C. straightedge D. taper gauge
A
Oil dye is sometimes added to motor oil to ______ A. detect leaks B. detect contaminants C. destroy corrosive chemicals D. determine frequency of oil changes
A
The ______ protects the atmosphere from fumes by burning them inside the engine. A. positive crankcase ventilation system B. low oil pressure safety circuit C. filter bypass valve D. pressure relief valve
A
The face of a compression ring may be _____ to speed the process of ring seating. A. grooved B. chamfered C. tapered D. counterbored
A
The largest possible diameter increase to whieh a cylinder can be bored is called the _______ A. overbore limit B. maximum tolerance C. diametric extent D. optimum bore
A
Timing gear _____ is the amount of clearance between timing gear teeth. A. backlash B. end play C. runout D. alignment
A
To prepare for engine removal, most technicians first _____ A. disconneet parts under the engine B. remove the radiator and fan C. disconnect parts on the top of the engine D. disconnect all electrical wires between engine and chassis
A
An engine is being serviced. Worn camshaft lobes are found and the camshaft is being replaced. The car has 35,000 miles (56,300 km) on it. Technician A says that the timing belt should be replaced. Technician B says that the belt is good for 50,000 miles (80,500 km) and it should be reused. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
D
Technician A says that an engine's oil ring is normally made of cast iron. Technician B says that an engine's compression rings are usually made of steel. Who is right? A. A only. В. В only. C. Both A and B. D. Neither A nor B.
D
Technician A says that timing marks are not necessary when a timing belt is used. Technician B says that timing marks are unnecessary only with timing gears. Who is right? A. A only. B. B only. C. Both A and B D. Neither A nor B.
D
When servicing a vehicle with a manual transmission, the technician should check the _____ for problems. A. starter motor B. torque converter C. clutch friction disc D. flywheel
D
Which of the following is not a function of the lubrication system? A. Removing contaminants from inside engine. B. Reducing friction and wear between moving parts. C. Cutting power loss; increasing fuel economy. D Maintaining smooth power flow through drivetrain.
D
Which of the following is not a metal that is plated over a steel backing for use as an engine bearing? A. Aluminum. B. Babbitt. C. Copper. D. Magnesium.
D
Which of the following problems should you look for when inspecting a cylinder block? A. Cylinder ring ridge. B. Cylinder scoring. C. Cracked cylinder D All of the above.
D
True /False If a timing belt is reused, it should be installed to rotate in the opposite direction it previously rotated.
False
True /False The purpose of the timing belt cover is to keep debris out of the belt.
False
True /False Timing belt tension is correct when it can be twisted one-half turn.
False
True/ False A flex hone uses abrasive stones mounted on rubber pads to smooth cylinder walls.
False
True/ False A wheel puller is normally needed to remove the crankshaft timing gear.
False
True/ False Cogged timing belts are seldom used on today's OHC engines.
False
True/ False Core plugs are typically threaded for easy installation.
False
True/ False Cylinder boring, sleeving, or block replacement is needed when a cylinder is out-of-round by more than 0.003".
False
True/ False Installing new piston rings will compensate for an out-of-round cylinder.
False
True/ False Rod bearing clearance is measured using an outside micrometer,
False
True/False A broken-surface rod often can be rebuilt.
False
True/False A crank sprocket is usually mounted on the camshaft.
False
True/False A timing belt cover is different from an engine front cover.
False
True/False All late-model engine cylinder blocks are made from aluminum.
False
True/False Aluminum is seldom used for engine pistons.
False
True/False Cylinder bore is measured from top to bottom.
False
True/False Decarbonizing cleaner is applied by spraying it on the part to be cleaned.
False
True/False Dry sump lubrication systems are found only on older model cars.
False
True/False Gasoline engine compression pressures are typically higher than those of diesel engines.
False
True/False Generally. power steering and air conditioning lines should be disconnected before removing the engine.
False
True/False If a stand is not available, you can work on an engine that is suspended from a hoist or crane.
False
True/False Oil pumps are always driven by a gear on the camshaft.
False
