1
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ASE A1- Engine Repair Questions and
Answers (100% Correct Answers) Already
Graded A+
A compression test shows that one cylinder is too low. A leakage
test on that cylinder shows that there is excessive leakage. During
the test, air could be heard coming from the tailpipe. Which of the
following could be the cause?
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A. Broken piston rings
B. Bad head gasket
C. Bad exhaust gasket
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D. An exhaust valve not seating [ Ans: ] The correct answer is D. If
an exhaust valve is not seating, air will leak from the combustion
chamber by way of the valve out to the tailpipe and make an
audible sound. Broken rings or a bad head gasket would have air
leaking through the oil filler or cooling system.
Technician A says that main bearing oil clearance can be
checked with plastigage. Technician B says that main bearing oil
clearance can be checked with a dial bore gauge. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is C, both
technicians are right. Either method can be used to check main
bearing oil clearance.
Which of the following is NOT a method of correcting excessive
valve stem-to-guide clearance?
A. Knurling the valve stem
, 2
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B. Knurling the guide
C. Reaming for oversize
D. Guide replacement [ Ans: ] The correct answer is A. The valve
stem is hardened and cannot be knurled.
A vacuum gauge is connected to the intake manifold of an
engine running at idle. The pointer on the gauge fluctuates rapidly
but steadies as the engine speed is increased. The test results
indicate:
A. A leaking intake manifold gasket
B. Worn valve guides
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C. Late ignition timing
D. A weak valve spring [ Ans: ] The correct answer is B. Worn
valve guide could cause the needle to fluctuate rapidly at idle
but steady as the engine speed is increased. A leaking intake
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manifold gasket or late ignition timing would cause a steady low
reading. A weak valve spring would cause the gauge needle to
fluctuate as engine speed increased.
A technician takes a compression reading on a 4-cylinder engine,
and gets readings of 140, 135, 135, and 40 psi. Then he preforms a
wet compression test, and the readings are almost the same as
those in the first test. Technician A says that a burned valve could
cause these readings. Technician B says that a broken piston ring
could cause these readings. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is A, only technician
A is correct. A burned valve will not allow the cylinder to build
compression, and the results from wet and dry compression tests
will be the same. If piston rings (or worn cylinder walls) were at
fault, compression readings from a wet test would exceed dry test
results.
, 3
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Technician A says that retarded valve timing can cause high
cylinder compression readings. Technician B says that a lean
air/fuel mixture can cause a high intake manifold vacuum
reading. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is D, neither
technician is right. Technician A is wrong because retarded valve
timing will cause the valves to open and close at the wrong time,
thereby reducing compression and manifold vacuum readings.
© 2025 Assignment Expert
Retarded valve timing can be caused by a loose timing belt or
chain jumping one or more teeth. Technician B is wrong because
a low but steady manifold vacuum reading may be caused by a
lean air/fuel mixture. Air leaks or vacuum leaks can cause a lean
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condition and are common causes of rough idle, hesitation,
stalling and hard starting. If the mixture is artificially enriched by
injecting propane into the induction system, and engine running
lean should speed up and the vacuum reading should rise.
An engine is being rebuilt and the crankshaft connecting rod
journals have been ground undersize. Specifications show that the
original connecting rod journal size was 2.1228-in. 2.1236-in. If the
journals now measure 2.1032-in., what size bearings should be
used?
A. 0.001-in. undersize
B. 0.010-in. undersize
C. 0.020-in. undersize
D. 0.030-in. undersize [ Ans: ] The correct answer is C. Adding
0.020 to 2.1032 is 2.1232, which is right in the middle of the
standard specifications, so 0.020-in. undersize bearings should be
used.
Camshaft lift is defined as:
A. the distance the valves are open
For Expert help and assignment solutions, +254707240657
ASE A1- Engine Repair Questions and
Answers (100% Correct Answers) Already
Graded A+
A compression test shows that one cylinder is too low. A leakage
test on that cylinder shows that there is excessive leakage. During
the test, air could be heard coming from the tailpipe. Which of the
following could be the cause?
© 2025 Assignment Expert
A. Broken piston rings
B. Bad head gasket
C. Bad exhaust gasket
Guru01 - Stuvia
D. An exhaust valve not seating [ Ans: ] The correct answer is D. If
an exhaust valve is not seating, air will leak from the combustion
chamber by way of the valve out to the tailpipe and make an
audible sound. Broken rings or a bad head gasket would have air
leaking through the oil filler or cooling system.
Technician A says that main bearing oil clearance can be
checked with plastigage. Technician B says that main bearing oil
clearance can be checked with a dial bore gauge. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is C, both
technicians are right. Either method can be used to check main
bearing oil clearance.
Which of the following is NOT a method of correcting excessive
valve stem-to-guide clearance?
A. Knurling the valve stem
, 2
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B. Knurling the guide
C. Reaming for oversize
D. Guide replacement [ Ans: ] The correct answer is A. The valve
stem is hardened and cannot be knurled.
A vacuum gauge is connected to the intake manifold of an
engine running at idle. The pointer on the gauge fluctuates rapidly
but steadies as the engine speed is increased. The test results
indicate:
A. A leaking intake manifold gasket
B. Worn valve guides
© 2025 Assignment Expert
C. Late ignition timing
D. A weak valve spring [ Ans: ] The correct answer is B. Worn
valve guide could cause the needle to fluctuate rapidly at idle
but steady as the engine speed is increased. A leaking intake
Guru01 - Stuvia
manifold gasket or late ignition timing would cause a steady low
reading. A weak valve spring would cause the gauge needle to
fluctuate as engine speed increased.
A technician takes a compression reading on a 4-cylinder engine,
and gets readings of 140, 135, 135, and 40 psi. Then he preforms a
wet compression test, and the readings are almost the same as
those in the first test. Technician A says that a burned valve could
cause these readings. Technician B says that a broken piston ring
could cause these readings. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is A, only technician
A is correct. A burned valve will not allow the cylinder to build
compression, and the results from wet and dry compression tests
will be the same. If piston rings (or worn cylinder walls) were at
fault, compression readings from a wet test would exceed dry test
results.
, 3
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Technician A says that retarded valve timing can cause high
cylinder compression readings. Technician B says that a lean
air/fuel mixture can cause a high intake manifold vacuum
reading. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B [ Ans: ] The correct answer is D, neither
technician is right. Technician A is wrong because retarded valve
timing will cause the valves to open and close at the wrong time,
thereby reducing compression and manifold vacuum readings.
© 2025 Assignment Expert
Retarded valve timing can be caused by a loose timing belt or
chain jumping one or more teeth. Technician B is wrong because
a low but steady manifold vacuum reading may be caused by a
lean air/fuel mixture. Air leaks or vacuum leaks can cause a lean
Guru01 - Stuvia
condition and are common causes of rough idle, hesitation,
stalling and hard starting. If the mixture is artificially enriched by
injecting propane into the induction system, and engine running
lean should speed up and the vacuum reading should rise.
An engine is being rebuilt and the crankshaft connecting rod
journals have been ground undersize. Specifications show that the
original connecting rod journal size was 2.1228-in. 2.1236-in. If the
journals now measure 2.1032-in., what size bearings should be
used?
A. 0.001-in. undersize
B. 0.010-in. undersize
C. 0.020-in. undersize
D. 0.030-in. undersize [ Ans: ] The correct answer is C. Adding
0.020 to 2.1032 is 2.1232, which is right in the middle of the
standard specifications, so 0.020-in. undersize bearings should be
used.
Camshaft lift is defined as:
A. the distance the valves are open
