ENGINE REPAIR MICHIGAN MECHANIC
STUDY GUIDE QUESTIONS ANSWERS
2025
The hydraulic lifters are noisy at highway speeds but quiet at low speeds. What should you do first as
you diagnose this problem? - correct answer -a. Check lifter leakdown rate.
B. Check crankcase oil level. (CORRECT ANSWER)
C. Check lifter clearance hot. (not CORRECT ANSWER)
D. Check lifter clearance cold.
The valve timing on most engines is controlled by: - correct answer -
a. An on board computer. (not CORRECT ANSWER)
B. A centrifugal advance unit.
C. A vacuum advance unit
D. A belt, chain or gear drive. (CORRECT ANSWER)
The bearing inserts below have been plastigaged. What can you determine about these pictures? -
correct answer -a. Both bearing journals are out of round. (not CORRECT ANSWER)
B. Insert "b" has more clearance.
C. Insert"a" has more clearance.
D. Both bearings have excessive taper.
, The compression test has showed that the middle two cylinders on one side of a v-
8 engine had readings of 50 psi. The other cylinders had readings between 135 psi and 140 psi. What i
s the likely cause of this condition? - correct answer -a. A burned exhaust valve
B. A blown intake manifold gasket.
C. A blown head gasket. (CORRECT ANSWER)
D. A burned intake valve. (not CORRECT ANSWER)
Excessively worn valve guides: - correct answer -a. May be replaced if removable.
B. May be reamed to oversize.
C. May cause oil consumption.
D. All of the above. (CORRECT ANSWER)
Intake valve deposits, as shown below: - correct answer -a. Will not affect engine performance.
B. Can reduce volumetric efficiency and affect high rpm performance.
C. Can cause driveability problems during cold engine operation.
D. Both b and c. (CORRECT ANSWER)
What is being checked on the valve spring in the illustration below? - correct answer -
a. Installed height (CORRECT ANSWER)
B. Squareness
C. Coil taper
D. Tension (not CORRECT ANSWER)
You are using a vacuum gauge connected to the intake manifold. Which of the following is true? -
correct answer -
a. When the engine is rapidly accelerated, the needle will rise to a high reading. (possible correct awn
ser)
B. When the throtle is released suddenly from 2500 rpm, the needle will snap to a higher than normal
reading for an instant.
C. A "normal" gauge reading at idle would be 7-10 inches.
D. All of the above. (not CORRECT ANSWER)
STUDY GUIDE QUESTIONS ANSWERS
2025
The hydraulic lifters are noisy at highway speeds but quiet at low speeds. What should you do first as
you diagnose this problem? - correct answer -a. Check lifter leakdown rate.
B. Check crankcase oil level. (CORRECT ANSWER)
C. Check lifter clearance hot. (not CORRECT ANSWER)
D. Check lifter clearance cold.
The valve timing on most engines is controlled by: - correct answer -
a. An on board computer. (not CORRECT ANSWER)
B. A centrifugal advance unit.
C. A vacuum advance unit
D. A belt, chain or gear drive. (CORRECT ANSWER)
The bearing inserts below have been plastigaged. What can you determine about these pictures? -
correct answer -a. Both bearing journals are out of round. (not CORRECT ANSWER)
B. Insert "b" has more clearance.
C. Insert"a" has more clearance.
D. Both bearings have excessive taper.
, The compression test has showed that the middle two cylinders on one side of a v-
8 engine had readings of 50 psi. The other cylinders had readings between 135 psi and 140 psi. What i
s the likely cause of this condition? - correct answer -a. A burned exhaust valve
B. A blown intake manifold gasket.
C. A blown head gasket. (CORRECT ANSWER)
D. A burned intake valve. (not CORRECT ANSWER)
Excessively worn valve guides: - correct answer -a. May be replaced if removable.
B. May be reamed to oversize.
C. May cause oil consumption.
D. All of the above. (CORRECT ANSWER)
Intake valve deposits, as shown below: - correct answer -a. Will not affect engine performance.
B. Can reduce volumetric efficiency and affect high rpm performance.
C. Can cause driveability problems during cold engine operation.
D. Both b and c. (CORRECT ANSWER)
What is being checked on the valve spring in the illustration below? - correct answer -
a. Installed height (CORRECT ANSWER)
B. Squareness
C. Coil taper
D. Tension (not CORRECT ANSWER)
You are using a vacuum gauge connected to the intake manifold. Which of the following is true? -
correct answer -
a. When the engine is rapidly accelerated, the needle will rise to a high reading. (possible correct awn
ser)
B. When the throtle is released suddenly from 2500 rpm, the needle will snap to a higher than normal
reading for an instant.
C. A "normal" gauge reading at idle would be 7-10 inches.
D. All of the above. (not CORRECT ANSWER)
