ASE A1 ENGINE REPAIR Practice Test
2 Questions with 100% Correct Answers
Latest Update Top Rated A+
Technician A says that engine cylinders wear most at the top of the ring travel. Technician
B says that the difference in cylinder bore measurements taken parallel and perpendicular
to the crankshaft will indicate cylinder bore taper. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. Technician A is correct because most wear to
the engine cylinder is at he top where ring loading is the greatest. Technician B is wrong
because the difference in bore measurements taken at points parallel and perpendicular to
the crankshaft will indicate cylinder bore out-of-roundness.
A tapping noise can be heard coming from the upper part of an engine running at idle.
Which of the following could be the cause?
A. Valve clearance out of adjustment
B. Worn rocker arm shaft
C. Loose exhaust manifold
D. All of the above - The correct answer is D. Tapping noises are most often caused by loose
valvetrain clearances or worn components. However, a tapping sound that may sound like
a valvetrain noise can actually be caused by an exhaust leak at the exhaust
manifold/cylinder head juncture.
An engine's upper and lower center main bearings show more wear than the ones toward
either end of the crankshaft. Technician A says this wear pattern could be due to a bent
crankshaft and replacing it with one that is straight will fix the problem. Technician B says
that the cylinder block main bearing bores are misaligned and the problem can be fixed by
align boring or honing the block. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. A bent crankshaft could cause more wear on
both bearings in the center of a block; straightening or replacing the crankshaft would be
the correct repair. A warped block would cause wear on either the upper or the lower
bearing, depending on how the block was warped.
,Blue-gray smoke comes from the exhaust of a vehicle during deceleration. Of the following,
which is the LEAST likely cause?
A. Worn valve guides.
B. Broken valve seals.
C. Worn piston rings.
D. Clogged oil return passages. - The correct answer is C. Worn piston rings will usually
make an engine smoke worse under acceleration. All of the other causes can allow oil to be
drawn through the valve guides under the high intake vacuum that occurs during
deceleration.
When a cylinder head is disassembled, the stem height on one of the valve is found to be
too high. Which of the following can correct this?
A. Regrind the valve
B. Regrind the valve seat
C. Install a new valve seat
D. Install a shim - The correct answer is C. Installing a new valve seat will position the valve
lower in the head and reduce stem height. A and B are incorrect because grinding the valve
or seat will place the valve higher in the head and increase the stem height. D is also wrong;
shims are used to correct valve spring installed height.
All of the following methods can be used to find cracks in aluminum heads EXCEPT:
A. Pressure test
B. Magnetic particle detection
C. Visual inspection
D. Dye penetrant - The correct answer is B. Magnetic particle detection can only be used on
ferrous (iron and steel) parts.
Technician A says that before installing an oil pump, it should be primed with clean engine
oil. Technician B says that before installing an oil pump, the position of the pickup screen
should be checked to make sure it fits closely to the bottom of the oil pan. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is C, both technicians are right. The oil pump should
be filled with oil during engine reassembly to prevent it from cavitating or sucking air
during engine start-up. To prevent the pickup from sucking air and subsequent oil
starvation and engine damage, make sure the pickup screen is positioned close to the
bottom of the oil pan to ensure it is always submerged in oil.
Crankshaft journals should be measured for:
A. Diameter
B. Out-of-round
C. Taper
D. All of the above - The correct answer is D. The crankshaft main and rod journals should
be inspected and measured for diameter, out-of-round, and taper wear.
, All of the following can cause low oil pressure EXCEPT:
A. Diluted engine oil
B. Worn pistons
C. Excessive bearing clearance
D. Clogged oil pump pickup - The correct answer is B. Worn pistons can cause noise and
accelerate ring and bore wear, but would not cause low oil pressure. Diluted oil, excessive
bearing clearance and a clogged pump pickup can all cause low oil pressure.
While conducting a cylinder leakage test, bubbles are seen in the coolant in the radiator.
Technician A says a failed exhaust valve is the cause. Technician B says a failed intake valve
is the cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is D, neither technician is right. If a failed exhaust
valve was the cause, air would be heard from the exhaust pipe. If the intake valve failed, air
would be heard from the carburetor or throttle valve assembly. If bubbles are seen in the
radiator coolant the cause could be a leaking cylinder head gasket or a cracked head or
block.
Technician A says that umbrella valve seals are installed in their operating position during
cylinder head assembly. Technician B says that positive valve seals are position by the
valve. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is D, neither technician is right. Umbrella seals are
installed by pushing the seal down on the valve stem until it touches the valve guide boss. It
will be positioned correctly the first time the valve opens. Positive seals are tapped into
place on the guide boss during assembly using a special installation tool and a small mallet.
Technician A says that excessive grinding of valve faces and seats allows the valve tips to
move too far away from their spring seats. Technician B says grinding the stem tips helps to
correct minor changes in valve spring installed height. Who is right?A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. The stem tip height increases with valve or seat
grinding. Grinding stem tips can change the stem tip height, but will have no effect on the
valve spring installed height. That measurement is controlled by the height of the keeper
grooves above the spring seat of the head. Valve spring installed height is corrected by
installing shim(s) between the valve spring and cylinder head.
Technician A says that excessive cylinder head or block deck resurfacing on a pushrod
engine can change the geometry between the valve stem tip and rocker arm. Technician B
says that excessive grinding of the valve face and seat changes the geometry between the
valve stem tip and rocker arm. Who is right?
2 Questions with 100% Correct Answers
Latest Update Top Rated A+
Technician A says that engine cylinders wear most at the top of the ring travel. Technician
B says that the difference in cylinder bore measurements taken parallel and perpendicular
to the crankshaft will indicate cylinder bore taper. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. Technician A is correct because most wear to
the engine cylinder is at he top where ring loading is the greatest. Technician B is wrong
because the difference in bore measurements taken at points parallel and perpendicular to
the crankshaft will indicate cylinder bore out-of-roundness.
A tapping noise can be heard coming from the upper part of an engine running at idle.
Which of the following could be the cause?
A. Valve clearance out of adjustment
B. Worn rocker arm shaft
C. Loose exhaust manifold
D. All of the above - The correct answer is D. Tapping noises are most often caused by loose
valvetrain clearances or worn components. However, a tapping sound that may sound like
a valvetrain noise can actually be caused by an exhaust leak at the exhaust
manifold/cylinder head juncture.
An engine's upper and lower center main bearings show more wear than the ones toward
either end of the crankshaft. Technician A says this wear pattern could be due to a bent
crankshaft and replacing it with one that is straight will fix the problem. Technician B says
that the cylinder block main bearing bores are misaligned and the problem can be fixed by
align boring or honing the block. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. A bent crankshaft could cause more wear on
both bearings in the center of a block; straightening or replacing the crankshaft would be
the correct repair. A warped block would cause wear on either the upper or the lower
bearing, depending on how the block was warped.
,Blue-gray smoke comes from the exhaust of a vehicle during deceleration. Of the following,
which is the LEAST likely cause?
A. Worn valve guides.
B. Broken valve seals.
C. Worn piston rings.
D. Clogged oil return passages. - The correct answer is C. Worn piston rings will usually
make an engine smoke worse under acceleration. All of the other causes can allow oil to be
drawn through the valve guides under the high intake vacuum that occurs during
deceleration.
When a cylinder head is disassembled, the stem height on one of the valve is found to be
too high. Which of the following can correct this?
A. Regrind the valve
B. Regrind the valve seat
C. Install a new valve seat
D. Install a shim - The correct answer is C. Installing a new valve seat will position the valve
lower in the head and reduce stem height. A and B are incorrect because grinding the valve
or seat will place the valve higher in the head and increase the stem height. D is also wrong;
shims are used to correct valve spring installed height.
All of the following methods can be used to find cracks in aluminum heads EXCEPT:
A. Pressure test
B. Magnetic particle detection
C. Visual inspection
D. Dye penetrant - The correct answer is B. Magnetic particle detection can only be used on
ferrous (iron and steel) parts.
Technician A says that before installing an oil pump, it should be primed with clean engine
oil. Technician B says that before installing an oil pump, the position of the pickup screen
should be checked to make sure it fits closely to the bottom of the oil pan. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is C, both technicians are right. The oil pump should
be filled with oil during engine reassembly to prevent it from cavitating or sucking air
during engine start-up. To prevent the pickup from sucking air and subsequent oil
starvation and engine damage, make sure the pickup screen is positioned close to the
bottom of the oil pan to ensure it is always submerged in oil.
Crankshaft journals should be measured for:
A. Diameter
B. Out-of-round
C. Taper
D. All of the above - The correct answer is D. The crankshaft main and rod journals should
be inspected and measured for diameter, out-of-round, and taper wear.
, All of the following can cause low oil pressure EXCEPT:
A. Diluted engine oil
B. Worn pistons
C. Excessive bearing clearance
D. Clogged oil pump pickup - The correct answer is B. Worn pistons can cause noise and
accelerate ring and bore wear, but would not cause low oil pressure. Diluted oil, excessive
bearing clearance and a clogged pump pickup can all cause low oil pressure.
While conducting a cylinder leakage test, bubbles are seen in the coolant in the radiator.
Technician A says a failed exhaust valve is the cause. Technician B says a failed intake valve
is the cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is D, neither technician is right. If a failed exhaust
valve was the cause, air would be heard from the exhaust pipe. If the intake valve failed, air
would be heard from the carburetor or throttle valve assembly. If bubbles are seen in the
radiator coolant the cause could be a leaking cylinder head gasket or a cracked head or
block.
Technician A says that umbrella valve seals are installed in their operating position during
cylinder head assembly. Technician B says that positive valve seals are position by the
valve. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is D, neither technician is right. Umbrella seals are
installed by pushing the seal down on the valve stem until it touches the valve guide boss. It
will be positioned correctly the first time the valve opens. Positive seals are tapped into
place on the guide boss during assembly using a special installation tool and a small mallet.
Technician A says that excessive grinding of valve faces and seats allows the valve tips to
move too far away from their spring seats. Technician B says grinding the stem tips helps to
correct minor changes in valve spring installed height. Who is right?A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - The correct answer is A. The stem tip height increases with valve or seat
grinding. Grinding stem tips can change the stem tip height, but will have no effect on the
valve spring installed height. That measurement is controlled by the height of the keeper
grooves above the spring seat of the head. Valve spring installed height is corrected by
installing shim(s) between the valve spring and cylinder head.
Technician A says that excessive cylinder head or block deck resurfacing on a pushrod
engine can change the geometry between the valve stem tip and rocker arm. Technician B
says that excessive grinding of the valve face and seat changes the geometry between the
valve stem tip and rocker arm. Who is right?
