ASE A1 2025/2026 QUESTIONS WITH SOLUTIONS MARKED
A+
✔✔The camshaft bore should be inspected on which type(s) of engines?
a. Single overhead camshaft engines
b. Dual overhead camshaft engines
c. Cam-in block engines
d. All of the above - ✔✔The correct answer is d. The camshaft bore should be inspected
on all types of engines regardless of design. Answers a, b, and c are not correct
because the camshaft bores on all types of engines should be inspected.
✔✔What other engine component may have to be machined if the cylinder heads are
machined on a V-type engine?
a. Exhaust manifold
b. Intake manifold
c. Block deck
d. Distributor mount (if the vehicle is so equipped) - ✔✔The correct answer is b. The
intake manifold may require machining to fit onto the cylinder heads after they have
been machined. A formula is used to determine the amount that needs to be removed to
allow the intake manifold to align properly with the parts in the head. Answers a, c, and
d are not correct because these surfaces do not have to be machined when the cylinder
heads are machined.
✔✔A cylinder head is being installed. Technician A says to use a form-in-place sealant
between the block and the head. Technician B says that the "front" on a head gasket
indicates that it should be installed toward the auxiliary drive belt end of the engine.
Which technician is correct.
a. A only
b. B only
c. Both A and B
d. Neither A nor B - ✔✔The correct answer is b. Technician B only is correct. A head
gasket is labeled "front" if it has to be placed on the block correctly to avoid blocking
coolant passages. The word "front" does mean toward the front of the engine, which is
the accessory drive belt end. Answer a is not correct because form-in- place sealant is
only used to seal parts that experience low pressure and are not designed to take the
place of a cylinder head gasket. Answers c and d are not correct because only
Technician B is correct.
✔✔The torque-angle method involves ______________.
a. turning all bolts the same number of turns
b. torquing to specifications and loosening by a specified number of degrees
,c. torquing to one-half specifications, then to three-quarter torque, then to full torque
d. turning bolts a specified number of degrees after initial torque - ✔✔The correct
answer is d. The torque-angle method of tightening involves torquing the fasteners to a
specified torque and then turning them a specified number of degrees. Answer a is not
correct because even though all bolts should be turned the same number of degrees
(not turns), this answer does not include a specified initial torque as a starting point.
Answer b is not correct because this answer includes loosening the fasteners after
torquing instead of tightening after the initial torquing. Answer c is the usual method to
tighten a fastener using a torque wrench instead of using the torque- angle method as
specified in the question.
✔✔Piston ring end gap can be increased by ______________.
a. filing the ring to make the gap larger
b. installing oversize rings
c. sleeving the cylinder
d. knurling the piston - ✔✔The correct answer is a. The piston ring end gap can be
increased by filing the ends of the piston ring. Answer b is not correct because oversize
rings would decrease the piston ring end gap. Answer c is not correct because a sleeve
is used to restore the cylinder and while a slightly larger bore would cause the piston
ring end gap to increase, the installation of a sleeve by itself would not necessarily
increase piston ring end gap. Answer d is not correct because knurling the piston would
increase the diameter of the piston skirt and would not increase the piston ring end gap.
✔✔The most common cause of premature bearing failure is ______________.
a. misassembly
b. dirt
c. lack of lubrication
d. overloading - ✔✔The correct answer is b. According to engine bearing
manufacturers, the most common cause of premature bearing failure is dirt. Answers a,
c, and d are each a possible cause of premature engine bearing failure, but they are not
the most common cause.
✔✔To check a crankshaft journal for taper and out-of-round, the journal should be
measured in at least how many locations?
a. One
b. Two
c. Four
d. Six - ✔✔The correct answer is d. To check for taper, the crankshaft journal has to be
measured at a minimum of six locations. Answers a, b, and c are not correct because
when measuring taper, there must be at least two measurements so the difference
(taper) can be determined and this does not allow enough measurements to determine
, out-of-round. To be able to determine accurately whether or not a crank- shaft journal is
out-of-round or tapered, at least six measurements must be taken 120° apart.
✔✔Piston ring end gap should only be measured ______________.
a. after all cylinder work has been performed
b. after installing the piston in the cylinder
c. after installing the rings on the piston
d. Both a and c - ✔✔The correct answer is a. The cylinder should be bored and/or
honed and thoroughly cleaned before the piston ring end gap is checked. Answers b, c,
and d are not correct because the ring gap cannot be checked after the piston has been
installed in the cylinder.
✔✔Piston ring side clearance is a measure taken between the ______________ and
the ______________.
a. piston (side skirt); cylinder wall
b. piston pin; piston pin retainer (clip)
c. piston ring; piston ring land
d. compression ring; oil control ring - ✔✔The correct answer is c. The side clearance is
between the piston ring and piston ring groove. This clearance allows the piston ring to
twist during engine operation. Answer a is not correct because this is the piston-to-
cylinder wall clearance, not the piston ring side clearance. Answers b and d are not cor-
rect because they do not represent the difference between the piston ring and the piston
ring groove.
✔✔Before the timing chain on an OHV engine can be inspected and removed, the
following component(s) must be removed:
a. Valve cover (rocker arm cover)
b. Vibration damper
c. Cylinder head(s)
d. Intake manifold (V-type engines only) - ✔✔The correct answer is b. The vibration
damper (harmonic balancer) has to be removed on an OHV engine to gain access to
the timing gear and chain. Answers a, c, and d are not correct because removing the
valve cover, cylinder head, or intake manifold will not allow access to the timing chain.
✔✔Lower than normal oil pressure could be caused by ______________.
a. a worn oil pump
b. worn rod bearings
c. worn main bearing
d. any of the above - ✔✔The correct answer is d. Answer a is correct because lower
than normal oil pressure can be caused by a worn oil pump because it may not be able
to supply enough oil to keep the bearing clearance filled with oil. Answers b and c are
A+
✔✔The camshaft bore should be inspected on which type(s) of engines?
a. Single overhead camshaft engines
b. Dual overhead camshaft engines
c. Cam-in block engines
d. All of the above - ✔✔The correct answer is d. The camshaft bore should be inspected
on all types of engines regardless of design. Answers a, b, and c are not correct
because the camshaft bores on all types of engines should be inspected.
✔✔What other engine component may have to be machined if the cylinder heads are
machined on a V-type engine?
a. Exhaust manifold
b. Intake manifold
c. Block deck
d. Distributor mount (if the vehicle is so equipped) - ✔✔The correct answer is b. The
intake manifold may require machining to fit onto the cylinder heads after they have
been machined. A formula is used to determine the amount that needs to be removed to
allow the intake manifold to align properly with the parts in the head. Answers a, c, and
d are not correct because these surfaces do not have to be machined when the cylinder
heads are machined.
✔✔A cylinder head is being installed. Technician A says to use a form-in-place sealant
between the block and the head. Technician B says that the "front" on a head gasket
indicates that it should be installed toward the auxiliary drive belt end of the engine.
Which technician is correct.
a. A only
b. B only
c. Both A and B
d. Neither A nor B - ✔✔The correct answer is b. Technician B only is correct. A head
gasket is labeled "front" if it has to be placed on the block correctly to avoid blocking
coolant passages. The word "front" does mean toward the front of the engine, which is
the accessory drive belt end. Answer a is not correct because form-in- place sealant is
only used to seal parts that experience low pressure and are not designed to take the
place of a cylinder head gasket. Answers c and d are not correct because only
Technician B is correct.
✔✔The torque-angle method involves ______________.
a. turning all bolts the same number of turns
b. torquing to specifications and loosening by a specified number of degrees
,c. torquing to one-half specifications, then to three-quarter torque, then to full torque
d. turning bolts a specified number of degrees after initial torque - ✔✔The correct
answer is d. The torque-angle method of tightening involves torquing the fasteners to a
specified torque and then turning them a specified number of degrees. Answer a is not
correct because even though all bolts should be turned the same number of degrees
(not turns), this answer does not include a specified initial torque as a starting point.
Answer b is not correct because this answer includes loosening the fasteners after
torquing instead of tightening after the initial torquing. Answer c is the usual method to
tighten a fastener using a torque wrench instead of using the torque- angle method as
specified in the question.
✔✔Piston ring end gap can be increased by ______________.
a. filing the ring to make the gap larger
b. installing oversize rings
c. sleeving the cylinder
d. knurling the piston - ✔✔The correct answer is a. The piston ring end gap can be
increased by filing the ends of the piston ring. Answer b is not correct because oversize
rings would decrease the piston ring end gap. Answer c is not correct because a sleeve
is used to restore the cylinder and while a slightly larger bore would cause the piston
ring end gap to increase, the installation of a sleeve by itself would not necessarily
increase piston ring end gap. Answer d is not correct because knurling the piston would
increase the diameter of the piston skirt and would not increase the piston ring end gap.
✔✔The most common cause of premature bearing failure is ______________.
a. misassembly
b. dirt
c. lack of lubrication
d. overloading - ✔✔The correct answer is b. According to engine bearing
manufacturers, the most common cause of premature bearing failure is dirt. Answers a,
c, and d are each a possible cause of premature engine bearing failure, but they are not
the most common cause.
✔✔To check a crankshaft journal for taper and out-of-round, the journal should be
measured in at least how many locations?
a. One
b. Two
c. Four
d. Six - ✔✔The correct answer is d. To check for taper, the crankshaft journal has to be
measured at a minimum of six locations. Answers a, b, and c are not correct because
when measuring taper, there must be at least two measurements so the difference
(taper) can be determined and this does not allow enough measurements to determine
, out-of-round. To be able to determine accurately whether or not a crank- shaft journal is
out-of-round or tapered, at least six measurements must be taken 120° apart.
✔✔Piston ring end gap should only be measured ______________.
a. after all cylinder work has been performed
b. after installing the piston in the cylinder
c. after installing the rings on the piston
d. Both a and c - ✔✔The correct answer is a. The cylinder should be bored and/or
honed and thoroughly cleaned before the piston ring end gap is checked. Answers b, c,
and d are not correct because the ring gap cannot be checked after the piston has been
installed in the cylinder.
✔✔Piston ring side clearance is a measure taken between the ______________ and
the ______________.
a. piston (side skirt); cylinder wall
b. piston pin; piston pin retainer (clip)
c. piston ring; piston ring land
d. compression ring; oil control ring - ✔✔The correct answer is c. The side clearance is
between the piston ring and piston ring groove. This clearance allows the piston ring to
twist during engine operation. Answer a is not correct because this is the piston-to-
cylinder wall clearance, not the piston ring side clearance. Answers b and d are not cor-
rect because they do not represent the difference between the piston ring and the piston
ring groove.
✔✔Before the timing chain on an OHV engine can be inspected and removed, the
following component(s) must be removed:
a. Valve cover (rocker arm cover)
b. Vibration damper
c. Cylinder head(s)
d. Intake manifold (V-type engines only) - ✔✔The correct answer is b. The vibration
damper (harmonic balancer) has to be removed on an OHV engine to gain access to
the timing gear and chain. Answers a, c, and d are not correct because removing the
valve cover, cylinder head, or intake manifold will not allow access to the timing chain.
✔✔Lower than normal oil pressure could be caused by ______________.
a. a worn oil pump
b. worn rod bearings
c. worn main bearing
d. any of the above - ✔✔The correct answer is d. Answer a is correct because lower
than normal oil pressure can be caused by a worn oil pump because it may not be able
to supply enough oil to keep the bearing clearance filled with oil. Answers b and c are
