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Engine Repair Questions and Correct Answers/ Latest
Update / Already Graded
1. A thermostat is being installed. Tech A says that the sensor pellet should face
the engine block. Tech B says that a faulty sensor pellet could cause the engine to
overheat. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: C. Both A and B
2. The engine oil pressure on a vehicle that has 85,000 miles on the odometer is
below specifications. Which of these is the most likely cause?
A. Incorrect valve timing.
B. Incorrect ignition timing.
C. A restricted oil filter.
D. A restricted oil pickup screen.
Ans: D. A restricted oil pickup screen.
3. A cylinder head is being installed. Tech A says that the head gasket should be
coated with wet sealant before installation. Tech B says that the sequence of
tightening head bolts is important for proper sealing. Who is right?
A. A only
B. B only
C. Both A and B
© 2025/ 2026 | ® All rights reserved
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D. Neither A nor B
Ans: B. B only
4. Tech A says that the valve overlap is when both the intake and exhaust valves
are open at the same time. Tech B says that valve overlap is controlled by the
camshaft. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: C. Both A and B
5. A vehicle runs with a misfire and its exhaust has excessive white smoke and a
sweet smell. Which of these could be the cause?
A. Induction crossfire at the plugs.
B. Carbon monoxide leak.
C. Head gasket leak.
D. Burned valve.
Ans: C. Head gasket leak.
6. Tech A says that the illustrated procedure checks cylinder deck height. Tech B
says that the illustrated procedure checks cylinder head warpage. Who is right?
A. A only
B. B only
C. Both A and B
© 2025/ 2026 | ® All rights reserved
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D. Neither A nor B
Ans: B. B only
7. Tech A says that it is necessary to pre-oil hydraulic lifters prior to installation.
Tech B says that the valves need to be adjusted periodically if engines are
equipped with hydraulic lifters. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: A. A only
8. Green fluid is noticed on the ground beneath a vehicles engine. This condition
could be caused by a leak at the:
A. Transmission cooler line.
B. Oil filter housing.
C. Power steering return hose.
D. Water pump.
Ans: D. Water pump.
9. An oil filter bypass valve:
A. Allows for adequate oil flow on a cold engine.
B. Allows engine oil to return to the pump after the engine is turned off.
C. Prevents air bubbles from entering the system.
© 2025/ 2026 | ® All rights reserved
Engine Repair Questions and Correct Answers/ Latest
Update / Already Graded
1. A thermostat is being installed. Tech A says that the sensor pellet should face
the engine block. Tech B says that a faulty sensor pellet could cause the engine to
overheat. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: C. Both A and B
2. The engine oil pressure on a vehicle that has 85,000 miles on the odometer is
below specifications. Which of these is the most likely cause?
A. Incorrect valve timing.
B. Incorrect ignition timing.
C. A restricted oil filter.
D. A restricted oil pickup screen.
Ans: D. A restricted oil pickup screen.
3. A cylinder head is being installed. Tech A says that the head gasket should be
coated with wet sealant before installation. Tech B says that the sequence of
tightening head bolts is important for proper sealing. Who is right?
A. A only
B. B only
C. Both A and B
© 2025/ 2026 | ® All rights reserved
, 2 | Page
D. Neither A nor B
Ans: B. B only
4. Tech A says that the valve overlap is when both the intake and exhaust valves
are open at the same time. Tech B says that valve overlap is controlled by the
camshaft. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: C. Both A and B
5. A vehicle runs with a misfire and its exhaust has excessive white smoke and a
sweet smell. Which of these could be the cause?
A. Induction crossfire at the plugs.
B. Carbon monoxide leak.
C. Head gasket leak.
D. Burned valve.
Ans: C. Head gasket leak.
6. Tech A says that the illustrated procedure checks cylinder deck height. Tech B
says that the illustrated procedure checks cylinder head warpage. Who is right?
A. A only
B. B only
C. Both A and B
© 2025/ 2026 | ® All rights reserved
, 3 | Page
D. Neither A nor B
Ans: B. B only
7. Tech A says that it is necessary to pre-oil hydraulic lifters prior to installation.
Tech B says that the valves need to be adjusted periodically if engines are
equipped with hydraulic lifters. Who is right?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Ans: A. A only
8. Green fluid is noticed on the ground beneath a vehicles engine. This condition
could be caused by a leak at the:
A. Transmission cooler line.
B. Oil filter housing.
C. Power steering return hose.
D. Water pump.
Ans: D. Water pump.
9. An oil filter bypass valve:
A. Allows for adequate oil flow on a cold engine.
B. Allows engine oil to return to the pump after the engine is turned off.
C. Prevents air bubbles from entering the system.
© 2025/ 2026 | ® All rights reserved
