ASE Diesel Engines test T2 | Study
Questions with 100% Correct Verified
Answers
The engine compression brake is inoperative. Which of the following is the most
likely cause?
A. Improperly adjusted intake valves
B. Misadjusted engine brake
C. Failed clutch switch
D. Misadjusted wastegate - ANSWER C. Failed clutch switch (A
failed clutch switch may prevent engine brake operation.)
,A diesel engine equipped with hydraulic electronic unit injection (HEUI) blows excessive
smoke. Technician A says the boost pressure sensor may be faulty. Technician B says
the coolant temperature sensor may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER A. A only
(A failed boost pressure sensor could report incorrect boost pressure and cause the
electronic control module (ECM) to over-fuel the engine, resulting in black smoke.)
A diesel engine oil sample shows excessive chromium content. Which of the
following would be the most likely source?
A. Rod barrings
B. Main bearings
C. Intake valves
D. Piston rings - ANSWER D. Piston rings
(Piston rings are chrome-plated; therefore, when they wear, excessive chromium
can show up in the oil sample.)
When installing an injector in an engine equipped with an HEUI fuel system, which
of the tools is normally used to adjust the injector?
A. Dial indicator
B. Torque wrench
C. Height gauge
, D. The injector is not adjusted after installation - ANSWER D. The injector is not adjusted
after installation
( The injector is not adjusted after installation, because oil pressure actuates the
injector plunger, not the camshaft.)
A charging circuit has a 2-volt drop on the positive side while under full load.
Technician A says this normal. Technician B says this could be caused by a loose
alternator ground. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER D. Neither A nor B
(The voltage drop should be very low on this cable, even under full load. The most likely
cause of this voltage drop is resistance in the circuit between the battery and alternator)
Technician A says stainless steel injector sleeves need to be reamed after installation.
Technician B says stainless steel injector sleeves need to be heated after installation.
Who is correct?
A. A only
B. B only
C. Both A and B
D.Neither A nor B - ANSWER D. Neither A nor B
(Copper sleeves need to be reamed after installation; stainless steel; Stainless
sleeves DO NOT. It is not a requirement to apply heat to either sleeve type during
this procedure.)
Questions with 100% Correct Verified
Answers
The engine compression brake is inoperative. Which of the following is the most
likely cause?
A. Improperly adjusted intake valves
B. Misadjusted engine brake
C. Failed clutch switch
D. Misadjusted wastegate - ANSWER C. Failed clutch switch (A
failed clutch switch may prevent engine brake operation.)
,A diesel engine equipped with hydraulic electronic unit injection (HEUI) blows excessive
smoke. Technician A says the boost pressure sensor may be faulty. Technician B says
the coolant temperature sensor may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER A. A only
(A failed boost pressure sensor could report incorrect boost pressure and cause the
electronic control module (ECM) to over-fuel the engine, resulting in black smoke.)
A diesel engine oil sample shows excessive chromium content. Which of the
following would be the most likely source?
A. Rod barrings
B. Main bearings
C. Intake valves
D. Piston rings - ANSWER D. Piston rings
(Piston rings are chrome-plated; therefore, when they wear, excessive chromium
can show up in the oil sample.)
When installing an injector in an engine equipped with an HEUI fuel system, which
of the tools is normally used to adjust the injector?
A. Dial indicator
B. Torque wrench
C. Height gauge
, D. The injector is not adjusted after installation - ANSWER D. The injector is not adjusted
after installation
( The injector is not adjusted after installation, because oil pressure actuates the
injector plunger, not the camshaft.)
A charging circuit has a 2-volt drop on the positive side while under full load.
Technician A says this normal. Technician B says this could be caused by a loose
alternator ground. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER D. Neither A nor B
(The voltage drop should be very low on this cable, even under full load. The most likely
cause of this voltage drop is resistance in the circuit between the battery and alternator)
Technician A says stainless steel injector sleeves need to be reamed after installation.
Technician B says stainless steel injector sleeves need to be heated after installation.
Who is correct?
A. A only
B. B only
C. Both A and B
D.Neither A nor B - ANSWER D. Neither A nor B
(Copper sleeves need to be reamed after installation; stainless steel; Stainless
sleeves DO NOT. It is not a requirement to apply heat to either sleeve type during
this procedure.)
