ASE A1 EXAM EVALUATION 2025/2026 QUESTIONS WITH
SOLUTIONS MARKED A+
✔✔Technician A says that a flat-tappet hydraulic lifter rotates during operation.
Technician B says the face of the lifter could be convex. 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. A flat-tapper
lifter face is convex, the cam lobe is slightly tapered (about 0.0005-0.0007-in.) and the
lifter bore is offset to make the lifter rotate during operation. This rotation is essential
because it spreads wear over a greater surface area. If the lifter fails to spin, it will
destroy itself and its cam lobe.
✔✔Technician A says that valve lash should be adjusted with the piston in the cylinder
being adjusted at TDC on the compression stroke. Technician B says that hydraulic
lifters should be adjusted to zero lash. 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. To adjust valve lash for one cylinder's
cam lobes, rotate the crankshaft so that its piston is at TDC on the compression stroke.
This will position the intake and exhaust valve lifters or OHC cam followers on the base
circle of the respective cam lobes. Hydraulic lifters should be adjusted until zero lash is
reached, then turned an additional number of turns (3/4 to 11/2 turns is typical). The
intent is to position the lifter plunger midway in its travel in the lifter body.
✔✔Technician A says that the thermostat controls maximum engine temperature.
Technician B says if the engine continuously runs hot, install a cooler thermostat. 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. The
thermostat's function is to allow the engine to come to operating temperature quickly
and then maintain a minimum operating temperature. The PCM bases fuel mixture,
ignition timing, EGR operation and other functions in part on input regarding coolant
temperature. Only the correct heat range thermostat should be installed. If the
thermostat is good and the engine runs hot, another problem exists.
✔✔Technician A says if the camshaft bores are more than 0.0015-in. (0.0381mm) out-
of-round, they should be align bored or align honed. Technician B says that the block
needs to be align bored or honed if bore alignment is not within 0.0015-in. (0.0381mm)
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.
✔✔Technician A says that cylinder head bolts should always be loosened in the reverse
order of the torque sequence. Technician B says that torque-to-yield head bolts cannot
be reused. 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 B. Some engines use torque-to-yield bolts.
These bolts are purposely overstretched when tightened and are not reused. Head bolts
should be removed in the sequence specified by the manufacturer, which may not be
the reverse order of the torque sequence If a removal sequence is not given, then
remove the bolts in the reverse order of the torque sequence.
✔✔Technician A is rebuilding an engine with a timing chain. Technician B is rebuilding
and engine with a timing belt. Technician A says that the timing chain is stretched and
must be replaced, however, the timing sprockets appear to be in good shape so they
can be reused. Technician B says he is replacing the timing belt and that this requires
him to also replace the timing sprockets. 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. A new timing
chain should always be installed on new sprockets. Unless they are damaged, it is
usually not necessary to replace the sprockets when replacing a timing belt.
✔✔All of the following are ways to clean an aluminum engine EXCEPT:
A. Cold solvent tank
B. Carburetor cleaner
C. Hot caustic tank
D. Pyrolytic oven - ✔✔The correct answer is C. Caustic will damage aluminum.
✔✔All of the following are methods of repairing a cracked block EXCEPT:
A. Pinning
B. Magnafluxing
C. Gluing
D. Welding - ✔✔The correct answer is B. Magnafluxing is used to detect cracks, not
repair them.
✔✔In order to perform a proper compression test, all of the following conditions should
be met EXCEPT:
A. The throttle blades should be held wide open
B. The battery should be fully charged
SOLUTIONS MARKED A+
✔✔Technician A says that a flat-tappet hydraulic lifter rotates during operation.
Technician B says the face of the lifter could be convex. 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. A flat-tapper
lifter face is convex, the cam lobe is slightly tapered (about 0.0005-0.0007-in.) and the
lifter bore is offset to make the lifter rotate during operation. This rotation is essential
because it spreads wear over a greater surface area. If the lifter fails to spin, it will
destroy itself and its cam lobe.
✔✔Technician A says that valve lash should be adjusted with the piston in the cylinder
being adjusted at TDC on the compression stroke. Technician B says that hydraulic
lifters should be adjusted to zero lash. 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. To adjust valve lash for one cylinder's
cam lobes, rotate the crankshaft so that its piston is at TDC on the compression stroke.
This will position the intake and exhaust valve lifters or OHC cam followers on the base
circle of the respective cam lobes. Hydraulic lifters should be adjusted until zero lash is
reached, then turned an additional number of turns (3/4 to 11/2 turns is typical). The
intent is to position the lifter plunger midway in its travel in the lifter body.
✔✔Technician A says that the thermostat controls maximum engine temperature.
Technician B says if the engine continuously runs hot, install a cooler thermostat. 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. The
thermostat's function is to allow the engine to come to operating temperature quickly
and then maintain a minimum operating temperature. The PCM bases fuel mixture,
ignition timing, EGR operation and other functions in part on input regarding coolant
temperature. Only the correct heat range thermostat should be installed. If the
thermostat is good and the engine runs hot, another problem exists.
✔✔Technician A says if the camshaft bores are more than 0.0015-in. (0.0381mm) out-
of-round, they should be align bored or align honed. Technician B says that the block
needs to be align bored or honed if bore alignment is not within 0.0015-in. (0.0381mm)
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.
✔✔Technician A says that cylinder head bolts should always be loosened in the reverse
order of the torque sequence. Technician B says that torque-to-yield head bolts cannot
be reused. 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 B. Some engines use torque-to-yield bolts.
These bolts are purposely overstretched when tightened and are not reused. Head bolts
should be removed in the sequence specified by the manufacturer, which may not be
the reverse order of the torque sequence If a removal sequence is not given, then
remove the bolts in the reverse order of the torque sequence.
✔✔Technician A is rebuilding an engine with a timing chain. Technician B is rebuilding
and engine with a timing belt. Technician A says that the timing chain is stretched and
must be replaced, however, the timing sprockets appear to be in good shape so they
can be reused. Technician B says he is replacing the timing belt and that this requires
him to also replace the timing sprockets. 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. A new timing
chain should always be installed on new sprockets. Unless they are damaged, it is
usually not necessary to replace the sprockets when replacing a timing belt.
✔✔All of the following are ways to clean an aluminum engine EXCEPT:
A. Cold solvent tank
B. Carburetor cleaner
C. Hot caustic tank
D. Pyrolytic oven - ✔✔The correct answer is C. Caustic will damage aluminum.
✔✔All of the following are methods of repairing a cracked block EXCEPT:
A. Pinning
B. Magnafluxing
C. Gluing
D. Welding - ✔✔The correct answer is B. Magnafluxing is used to detect cracks, not
repair them.
✔✔In order to perform a proper compression test, all of the following conditions should
be met EXCEPT:
A. The throttle blades should be held wide open
B. The battery should be fully charged
