Engine Repair Unit Test
Most late model vehicles will use ________ as an intake manifold gasket. A.Plastic/rubber B.Cork-rubber C.RTV D.Cork
A
Some of the wiring under the hood of a late model vehicle is encased in bright orange covering. This indicates a ________. A.High voltage electrical system B.High pressure air conditioning system C.High pressure hydraulic systems D.None of these
A
Technician A says that if the engine was removed with the transmission attached, the transmission should be reinstalled on the engine before other accessories are added. Technician B says that he flywheel attaching bolt holes are always evenly spaced so that the flywheel will fit in any way. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
A
A defective thermostat can cause the powertrain control module (PCM) to set what diagnostic trouble code (DTC)? A.P0300 B.P0172 C.P0128 D.P0171
C
Technician A says that all oil galleries must be thoroughly cleaned before engine assembly can begin. Technician B says that all expansion cups and plugs should be installed with a sealer to prevent leaks. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Why are the EGR gases cooled before entering the engine on some engines? A.To prevent heating the air-fuel mixture in the cylinder B.To prevent damage to the intake valves C.Cool exhaust gas is more effective at controlling NOx emissions D.To help prevent the exhaust from slowing down
C
A one piece oil pan gasket often uses ________ in the middle to add strength. A.Plastic (nylon) B.Carbon fiber C.Hard rubber D.Steel
D
A steel or copper wire used in a head gasket around the cylinder is called ________. A.Armor B.Fire ring C.Ridge block D.Either A or B
D
A thermostat can fail in which way? A.Stuck partially open B.Stuck open C.Stuck closed D.Any of the above
D
T or F: Coolant leaking from an intake manifold can evaporate fast enough to leave no trace of a leak.
T
"Dressing the engine" means __________. A. Installing all of the exterior engine components B. Cleaning the engine C. Changing the oil and filter D. Both A and C
A
A gasket failure caused by the movement of dissimilar materials is called ________. A.Fretting B.Collapsing C.Corrosion D.Tearing
A
Air filters can remove particles and dirt as small as ________. A.10 to 25 microns B.5 to 10 microns C.30 to 40 microns D.40 to 50 microns
A
Break-in engine oil is ________. A.Of the same viscosity and grade as that specified for normal engine operation B.SAE 40 C.SAE 30 D.SAE 20W-50
A
Cam bearings should be installed ________. A.Dry B.Oiled C.With 0.100 inches of crush D.Both B and C
A
Engine vacuum on a normal stock rebuilt engine should be ________ A.17 to 21 in. Hg. B.19 to 23 in. Hg. C.12 to 16 in. Hg. D.10 to 15 in. Hg.
A
How should the vehicle be driven to best break in a newly overhauled engine? A.At varying speeds and loads B.At idle speed and little or no load C.At high speeds and loads D.At a steady low speed
A
If the torque and horsepower readings are graphed, where do the curves cross (equal each other)? A.At 5,252 RPM B.At peak horsepower, which can vary from engine to engine C.At peak torque, which can vary from engine to engine D.Never
A
Main bearings and rod bearings should be checked for proper oil clearance by precision measuring the crankshaft journals and inside diameter of bearings, or by using which of these? A.Plastigage material B.Rubber gauging material C.Vernier caliper D.Steel ruler
A
On some engines equipped with a timing belt, the belt also may drive the ________. A.Water pump B.Power steering C.Alternator D.AC compressor
A
Some gaskets use a steel washer around each bolt hole. The purpose of this washer is to ________. A.Prevent the gasket from being compressed too much B.Help seal around the bolt hole C.Improve the strength of the gasket D.Help prevent the gasket from shrinking
A
Technician A says to be sure the piston notch "front" or arrow points toward the front of the engine. Technician B says to be sure that the piston ring gaps all line up before installing the piston.. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
A
Technician A says to carefully install all accessories when installing a replacement engine. Technician B says that when installing the transmission and other components on the engine block, be sure to use a box wrench to tighten all fasteners to factory specifications. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
A
The ________ is part of the transmission case on most automatic transmissions. A.Bell housing B.Drive plate C.Output shaft D.Input gear
A
Turning the oil pump before starting the engine should be done for all of these reasons, EXCEPT ________. A.To get the distributor in the right position B.Supply oil to the camshaft C.Lubricate valve train components D.Lubricate engine bearings
A
What can be used to check that the heads are at the correct angle for the intake manifold on a V-type engine? A.An angle gauge B.A tape measure C.A dial indicator D.A metal rule
A
What could occur if thread sealant was not installed on the threads of a head bolt being installed in a wet hole in the cylinder block? A.Coolant would leak from around the head bolt B.Threads would not be lubricated C.Cylinder block could be cracked D.Head bolt would apply too much clamping force
A
What force causes a head gasket to be drawn downward during engine operation? A.Intake stroke vacuum B.Exhaust gas pressure C.Head bolt torque D.Gravity
A
What is the purpose of the wire ring in this picture? A.To seal the combustion chamber B.Not enough information C.To seal the coolant passages D.To insulate the spark plug
A
What would happen if oil or water (coolant) was at the bottom of a dry hole in the bolt when the head bolts are installed and torqued? A.Block could crack B.Liquid would be forced upward and out of the hole C.Bolt would break D.Either B or C
A
Where is a multilayered steel (MLS) gasket most often used in an engine? A.Head gasket B.Intake manifold gasket C.Oil pan gasket D.Valve cover gasket
A
Which type of sealer is to be used on non-machined surfaces? A.RTV B.anaerobic sealer C.Either A or B D.Neither A nor B
A
Why must flat-bottom lifter camshafts be broken in at a fast idle? A.The cam in a cam-in-block engine is only lubricated by splash oil B.The flat-bottom of the lifters must become slightly concave in order to rotate C.Both A and B are correct D.Neither A nor B are correct
A
A skewed thermostat means it is ________. A.Not working B.Working, but not at the correct temperature C.Missing the thermo wax in the heat sensor D.Contaminated with coolant
B
A water pump can fail to provide the proper amount of coolant flow through the cooling system if what has happened? A.A bearing failure has caused the shaft to become loose B.The impeller blades are worn or slipping on the shaft C.The coolant is leaking from the weep hole D.The bearing is noisy
B
An engine block is being fitted with studs. Technician A says that the tightening torque in the installation instructions is for the stud and not the nut. Technician B says that if a thread locker is used, be sure to immediately install the main bearing caps before the compound cures to help avoid misalignment. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Engine pre-oiling is recommended for which of these reasons? A.Helps the rebuilt engine develop power B.Fills the oil passages with oil prior to initial start-up C.Both A and B D.Neither A nor B
B
In which type of vehicle is the engine most likely to be installed from underneath the vehicle? A.Rear wheel drive (RWD) B.Front wheel drive (FWD) C.Four wheel drive (4WD) D.Both A and C
B
Lugging an engine means ________. A.Wide-open throttle in low gear above 25 miles per hour B.That engine speed does not increase when the throttle is opened wider C.Starting a cold engine and allowing it to idle for longer than five minutes D.Both A and B
B
Technician A says that glues are used to help gaskets seal. Technician B says that deburring all sharp edges is an important step that has to be done to achieve proper engine assembly. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A says that it is generally easier to install the starter after the engine is put in the chassis.Technician B says that some engines drive all the accessories with one belt. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A says that the back of all engine bearings should be lubricated during assembly. Technician B says that the face of the main and rod bearings should be lubricated before final assembly. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A says that the cam bearings should be installed using a driver and dead blow hammer.Technician B says that main bearings and rod bearings should be checked for proper oil clearance by measuring the crankshaft journals and inside diameter of bearings. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A says that the torque applied to the head bolts is the same as the clamping force on the gasket. Technician B says that the clamping force is the force actually applied to the surfaces of the gasket. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A says to use SAE 30 engine oil on an engine break-in. Technician B says that it is recommended to change the engine oil and filter after 30 minutes of running time. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
Technician A uses a steel gasket scraper on aluminum engine parts. Technician B uses a plastic or wood scraper on aluminum engine parts. Which technician is correct? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
B
The TTY method of tightening bolts involves which of these processes? A.Torqueing to specifications and loosening by a specified number of degrees B.Turning bolts a specified number of degrees after initial torque C.Torqueing to one-half specifications, then to three-quarter torque, then to full torque D.Turning all bolts the same number of turns
B
The ________ smooths out the pressure pulses in the exhaust system, allowing them to be released at an even and constant rate. A.exhaust manifold B.muffler C.exhaust gas recirculation valve D.intake manifold
B
The pressure in a gasoline engine combustion chamber can be as high as ________. A.400° B.1000 PSI C.Both A and B D.Neither A nor B
B
The upper portion of a two part intake manifold is often called the ________. A.vacuum chamber B.plenum C.housing D.lower part
B
What can happen if gasket surfaces are too smooth? A.Nothing will happen B.Gasket can move out of proper location, causing leakage C.Gasket will not be able to seal the deep grooves in the surface D.Gasket will seal with no leaks
B
When changing a timing belt it is recommended that the ________ also be replaced. A.Air filter B.Front crankshaft seal C.Air pump seal D.Air intake hoses
B
Which computer sensor should be replaced to help ensure that the engine will be operating at the correct air-fuel ratio? A.Throttle position sensor B.Oxygen sensor C.Manifold absolute pressure sensor D.Engine coolant temperature sensor
B
Which product requires heat to remove? A.Blue thread locker B.Red thread locker C.Antiseize D.RTV
B
Why is the catalytic converter places as close to the engine as possible? A.To prevent the heat from the exhaust system moving upward toward the floor of the vehicle B.So the heat can help the converter work most efficiently C.To allow the exhaust pipes from the catalytic converter rearward to be a long as possible D.For easier access when working on the engine
B
A engine dynamometer is used to measure engine ________. A.Horsepower B.Weight C.Torque D.Mass
C
A hybrid electric vehicle has a feature that could allow the engine to start and run without warning. This feature is called ________. A.Self-start B.False off C.Idle stop D.Battery save
C
A vehicle has set DTC P0172, indicating a lean exhaust and a vacuum leak is suspected. This can be diagnosed by introducing ________ around the intake manifold gasket. A.Shop air B.Sprayed gasoline C.Propane D.Rock salt
C
Always adjust the ________ before starting the engine to help prevent thrust bearing damage A.Brake pedal travel B.Driveshaft angle C.Clutch free play D.Shift linkage
C
An intake manifold gasket has been replaced due to a vacuum leak. Which of the following steps uses a scan tool to complete the job? A.Refilling the cooling system B.Torquing the manifold bolts C.Idle relearn D.Air cleaner check
C
Coolant drained from the cooling system when replacing a thermostat or water pump should be ________. A.Poured down a toilet B.Filtered and reinstalled after the repair C.Disposed of properly or recycled D.Reused
C
Head gasket installation is being discussed. Technician A says that the surface finish of the cylinder head or block deck is very important for proper sealing to occur. Technician B says that if "front" is marked on a head gasket, the mark should be installed near the accessory drive belt end of the engine. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Piston ring end gap can be increased by ________. A.Sleeving the cylinder B.Knurling the piston C.Filing the ring to make gap larger D.Installing oversize rings
C
Technician A says oil that pressure should be tested before installation of the engine in the vehicle. Technician B says that some cylinder heads use the torque-to-yield method, where the head bolts are tightened to a specified torque and then rotated an additional specified number of degrees. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Technician A says that a cracked exhaust manifold can affect engine operation. Technician B says that a leaking lower intake manifold gasket could cause a vacuum leak. Which technician is correct? A.Technician A only B.Technician B only C.Both technicians D.Neither technician
C
Technician A says that gaskets are used to fill a space or gap between two objects to prevent leakage from occurring. Technician B says that there are many types of gaskets including cylinder head gaskets, valve cover gaskets, and timing cover gaskets. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Technician A says that some intake manifolds are plastic. Technician B says that some intake manifolds are constructed in two parts or sections: upper and lower. Which technician is correct? A.Technician A only B.Technician B only C.Both technicians D.Neither technician
C
Technician A says that studs should be installed finger tight. Technician B says that studs must be installed using a thread locker such as Locktite. Which technician is correct? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Technician A says that the piston and rod assembly should be installed in the cylinder after being carefully fitted for each bore. Technician B says that connecting rod side clearance should be checked with a feeler (thickness) gauge. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Technician A says to use lineman's gloves when servicing the high voltage system on hybrid electricvehicles. Technician B says that hybrid vehicles have a plug to disable the high voltage system before service. Which technician is correct? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
The air filter restriction indicator uses what to detect when it signals to replace the filter? A.The amount of light that can pass through the filter B.Number of miles or vehicle travel C.The amount of restriction measured in inches of water D.Number of hours of engine operation
C
The most common cause of premature bearing failure is ________. A.Overloading B.No lubrication C.Dirt D.Misalignment
C
The torque specification for many plastic intake manifolds are in what unit? A.Pound-feet B.Ft-lbs per minute C.Pound-inches D.Lb-ft per second
C
Two technicians are discussing the installation of a rebuilt engine into a vehicle. Technician A says that the radiator should be flow tested to help ensure that the engine will not overheat. Technician B says that a new thermostat should be installed. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Two technicians are discussing the torqueing procedure for head bolts. Technician A says that they should be tightened starting at the center of the head and working toward the ends. Technician B says that they should be tightened in three steps or according to the factory specified manner if torque-to-yield or torque-angle. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
C
Typical thrust bearing clearance is ________. A.0.001 to 0.003 B.0.050 to 0.100 C.0.002 to 0.012 D.0.025 to 0.035
C
Which of these head gaskets is most commonly used on engine equipped with an aluminum cylinder head on a cast iron block? A.Perforated steel core B.Solid steel core C.Multilayered steel (MLS) D.Either A or B
C
A technician is preparing to do an oil change on a hybrid vehicle. What special precaution needs to be taken BEFORE performing this service? A.Disconnect any orange colored wiring harnesses B.Do not lift the vehicle more than 12 inches off the floor C.Leave the hood closed when draining the oil D.Make sure the ignition is "OFF" and the key is removed from the ignition switch
D
About how much of the turning torque applied to a head bolt is lost to friction? A.60% B.20% C.40% D.80%
D
After rebuilding an engine, you need to have which of these near when the engine is first started? A.Blanket B.Bucket of water C.First Aid Kit D.Fire extinguisher
D
Before installing or starting a new or rebuilt engine, all of the following items should have been checked, EXCEPT ________. A.Pre-lube engine and check for proper oil pressure B.Battery fully charged C.Check that all of the vacuum lines are correctly installed and routed D.Rear axle is topped off
D
For high performance use, most experts recommend the use of ________ instead of standard bolts. A.Prevailing torque bolts B.Nuts C.Lag bolts D.Studs
D
Hybrid electric vehicles usually require special engine oil of what viscosity? A.SAE 5W-30 B.SAE 5W-40 C.SAE 10W-30 D.SAE 0W-20
D
If the bell housing is not properly torqued to the engine block, ________. A.The crankshaft will crack B.The bell housing will distort C.The engine block will crack D.The rear cylinder can be distorted (become out-of-round)
D
Intake manifold gaskets on a V-type engine can fail due to what factor? A.Coolant damage B.Relative movement between the intake manifold and the cylinder head C.Fretting D.All of the above
D
Normal operating temperature is reached when ________. A.The radiator cap releases coolant into the overflow B.The upper radiator hose is hot and pressurized C.The cooling fan has cycled at least once (if the vehicle is so equipped) D.Both B and C
D
Old style cork cover gaskets have been replaced by ________. A.Synthetic rubber gaskets B.Cork-rubber gaskets C.Rubber coated metal gaskets D.All of these
D
RTV (room temperature vulcanized) cures under which of these conditions? A.Moisture in the air B.At room temperature C.Without oxygen D.Both A and B
D
Service information states SAE 30 engine oil should be used on the threads of the head bolts, before installation and torquing. Technician A says that SAE 5W-30 will work. Technician B says that SAE that 10W-30 will work. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
D
Technician A says to always adjust the clutch free play after starting the engine. Technician B says that the old clutch disc can be reused if it looks OK. Who is right? A.Technician A only B.Technician B only C.Both technicians A and B D.Neither technician A nor B
D
The cylinder head bolts should be tightened (torqued) by which of these sequences? A.From the outside bolts to the inside bolts B.Starting at the front of the engine and torqueing bolts from front to rear C.Four outside bolts first, then from the center out D.From the inside bolts to the outside bolts
D
The term "volumetric efficiency" refers to the ability of an engine to ________. A.create heat B.create emissions C.distribute air evenly D.pull in air
D
Use of the wrong type of RTV silicone sealer could damage the ________. A.Crankshaft sensor B.Water pump gasket C.Water pump D.Oxygen sensor
D
What precautions should be followed when using gaskets? A.Read the instruction sheet B.Never reuse an old gasket C.A gasket should be checked to be sure that it is the correct gasket D.All of the above
D
When replacing a timing belt, many experts and vehicle manufacturers recommend that what other part(s) should be replaced? A.Tensioner assembly B.Camshaft oil seal(s) C.Water pump D.All of the above
D
Which of the following is/are terms for a variable intake manifold? A.Dual-stage intake (DSI) B.Variable volume induction (VVI) C.Variable intake system (VIS) D.Any of these
D
Which of these is TRUE about checking bearing clearances using Plastigage? A.The wider the strip means the narrower the oil clearance B.The journal should be clean and oil free C.The cap should be torqued to factory specifications D.All of the above
D
Which type of oil seal must NOT have oil applied to it for it to work correctly? A.Silicon rubber B.Viton C.Buna-N D.Teflon
D
Why do many port fuel injected engines use long intake runners? A.To increase high RPM power B.To heat the incoming air C.To reduce exhaust emissions D.To increase low RPM torque
D
T or F: A replacement plastic intake manifold may have a different design or appearance from the original factory-installed part.
T
