ASE A1- ENGINE REPAIR EXAM 2025
QUESTIONS WITH 100% SOLVED
ANSWERS!!
,1 of 75
Term
A single rod bearing shows excessive wear, but the rest show
normal wear. Technician A says this could be due to an out-of-round
connecting rod bore. Technician B says that this could be due to an
obstruction in the crankshaft oil passage(s) that supplies the bearing.
Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D.Neither A or B
Give this one a try later!
The correct answer is C, both technicians are right. One rod bearing
showing wear that is different than the rest could have an obstruction in the
crankshaft oil passage(s) that supplies the bearing or an out-of-round rod
bore.
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.
The correct answer is C, both technicians are right. The valve should be removed
from the hose and shake, If the valve rattles when shaken, it is not stuck open or
closed. The hose from the intake manifold to the PCV valve is most likely
plugged.
The correct answer is A. When you eliminate the ignition or injection to a cylinder
with a rod knock, the sound diminishes. Unlike a connecting rod bearing noise,
, piston slap does not quiet down and may in fact grow louder when you eliminate
ignition or fuel injection to that cylinder.
Don't know?
2 of 75
Term
Two technicians are inspecting an exhaust system. When he taps
on the muffler with a mallet, Technician A hears noise coming from
inside the muffler and says that it is most likely rotting out from
the inside. Technician B says that this type of failure is due to
chemical damage. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D.Neither A or B
Give this one a try later!
The correct answer is C, both technicians are right. A vacuum gauge connected
to the intake manifold or a pressure gauge installed in the front oxygen sensor
hole can be used to check for a restricted exhaust system. A blockage in
the exhaust system can be caused by physical damage, such as a dent in the
pipe, a clogged muffler or catalytic converter, or a collapsed exhaust pipe.
, The correct answer is B. When a cylinder is bored, 0.0025-0.003-in. (0.064-
0.076mm) cylinder wall material is left for finish honing to final size. This is
necessary to completely remove the rough finish left by the boring tool.
Following normal honing some manufacturers recommend a plateau finish in
the bore. Plateau honing levels off the peaks left in the bore surface from
honing. As a final polishing step it forms flat plateau areas between the grooves
or valleys of the crosshatch. A plateau surface retains oil and allows faster ring
seating,
while reducing ring and cylinder wear.
The correct answer is C, both technicians are right. Exhaust systems can
suffer chemical damage, causing the components in the system to rot out
from the inside. When the engine is started from cold, combustion gases
mix with condensation that forms when the hot exhaust contacts the colder
exhaust parts, forming acids that corrode the metal. This type of failure is
common on vehicles that are driven short distances, since the exhaust
system never gets warm enough to evaporate the moisture. To determine
chemical damage, tap on the exhaust pipes and muffler with a mallet and
listen for rattling or rust breaking loose, which would indicate a problem
inside the component. An exception to this would be the catalytic
converter. If a rattling sound is heard coming from a catalytic converter
when it is struck with a mallet, it means that the ceramic substrate has come
loose and is disintegrating.
The correct answer is D, neither technician is right. There are times when specific
gravity readings will be inaccurate. One is just after adding water to the battery.
After adding water, is it recommended to wait at least one day, or until the
vehicle has been operated for awhile, to check specific gravity. Another time is
during or just after charging. After charging, it is recommended to wait at least 15
minutes prior to checking specific gravity.
Don't know?
3 of 75
Term
QUESTIONS WITH 100% SOLVED
ANSWERS!!
,1 of 75
Term
A single rod bearing shows excessive wear, but the rest show
normal wear. Technician A says this could be due to an out-of-round
connecting rod bore. Technician B says that this could be due to an
obstruction in the crankshaft oil passage(s) that supplies the bearing.
Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D.Neither A or B
Give this one a try later!
The correct answer is C, both technicians are right. One rod bearing
showing wear that is different than the rest could have an obstruction in the
crankshaft oil passage(s) that supplies the bearing or an out-of-round rod
bore.
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.
The correct answer is C, both technicians are right. The valve should be removed
from the hose and shake, If the valve rattles when shaken, it is not stuck open or
closed. The hose from the intake manifold to the PCV valve is most likely
plugged.
The correct answer is A. When you eliminate the ignition or injection to a cylinder
with a rod knock, the sound diminishes. Unlike a connecting rod bearing noise,
, piston slap does not quiet down and may in fact grow louder when you eliminate
ignition or fuel injection to that cylinder.
Don't know?
2 of 75
Term
Two technicians are inspecting an exhaust system. When he taps
on the muffler with a mallet, Technician A hears noise coming from
inside the muffler and says that it is most likely rotting out from
the inside. Technician B says that this type of failure is due to
chemical damage. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D.Neither A or B
Give this one a try later!
The correct answer is C, both technicians are right. A vacuum gauge connected
to the intake manifold or a pressure gauge installed in the front oxygen sensor
hole can be used to check for a restricted exhaust system. A blockage in
the exhaust system can be caused by physical damage, such as a dent in the
pipe, a clogged muffler or catalytic converter, or a collapsed exhaust pipe.
, The correct answer is B. When a cylinder is bored, 0.0025-0.003-in. (0.064-
0.076mm) cylinder wall material is left for finish honing to final size. This is
necessary to completely remove the rough finish left by the boring tool.
Following normal honing some manufacturers recommend a plateau finish in
the bore. Plateau honing levels off the peaks left in the bore surface from
honing. As a final polishing step it forms flat plateau areas between the grooves
or valleys of the crosshatch. A plateau surface retains oil and allows faster ring
seating,
while reducing ring and cylinder wear.
The correct answer is C, both technicians are right. Exhaust systems can
suffer chemical damage, causing the components in the system to rot out
from the inside. When the engine is started from cold, combustion gases
mix with condensation that forms when the hot exhaust contacts the colder
exhaust parts, forming acids that corrode the metal. This type of failure is
common on vehicles that are driven short distances, since the exhaust
system never gets warm enough to evaporate the moisture. To determine
chemical damage, tap on the exhaust pipes and muffler with a mallet and
listen for rattling or rust breaking loose, which would indicate a problem
inside the component. An exception to this would be the catalytic
converter. If a rattling sound is heard coming from a catalytic converter
when it is struck with a mallet, it means that the ceramic substrate has come
loose and is disintegrating.
The correct answer is D, neither technician is right. There are times when specific
gravity readings will be inaccurate. One is just after adding water to the battery.
After adding water, is it recommended to wait at least one day, or until the
vehicle has been operated for awhile, to check specific gravity. Another time is
during or just after charging. After charging, it is recommended to wait at least 15
minutes prior to checking specific gravity.
Don't know?
3 of 75
Term
