ASE Diesel Engines test T2 practice test 1 With Complete
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
Which of the following should be done after installing a new copper
injector sleeve?
A. Heat it
B. Dress it
C. Ream the seat
D. Coat it with a looking compound - (ANSWERS)C. Ream the seat
(This reaming ensures there will be a good clean area for the injector to seal
against)
A diesel engine has oil in the radiator. Which of the following would be the
cause?
A. Cracked piston cooling nozzle
B. Cracked oil cooler
C. Restricted turbocharger drain line
D. Restricted exhaust gas recirculation (EGR) cooler - (ANSWERS)B.
Cracked oil cooler
( A cracked oil cooler will allow the oil into the cooling system; thus, oil
would get in the radiator.)
A diesel engine has bubbles flowing in the clear bowl on the fuel/water
separator. Technician A says this is caused by a restricted fuel return line.
Technician B says this is caused by leaks on the return side of the fuel
system. Who is correct?
A. A only
,ASE Diesel Engines test T2 practice test 1 With Complete
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
B. B only
C. Both A and B
D. Neither A nor B - (ANSWERS)D. Neither A nor B
(Bubbles flowing the separator indicate an air leak on the suction side of the
fuel system.)
A truck has been sitting for 12 hours. Which of the following open-circuit
voltages would indicate a fully charged battery?
A. 11.6 volts
B. 12.0 volts
C. 12.6 volts
D. 13.0 volts - (ANSWERS)C. 12.6
(A fully charged battery should have an open-circuit voltage of 12.6 volts.)
The engine oil pressure gauge fluctuates greatly. All of the following be the
cause EXCEPT:
A. The oil pan is overfilled
B. The oil pickup tube is loose
C. The wrong engine oil was installed
D. The oil pressure sensor is failing - (ANSWERS)C. The wrong engine oil
was installed
( The incorrect oil may not provide proper lubrication, but it will NOT
cause great pressure fluctuations)
The engine brake will occasionally come on when pulling a hill. Technician
, ASE Diesel Engines test T2 practice test 1 With Complete
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
A says the clutch switch may be faulty. Technician B says the master switch
may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - (ANSWERS)D. Neither A nor B
(If the engine brake engages while pulling a hill, the most likely problem is
with accelerator pedal position sensor.)
A piston has a diagonal wear pattern across the skirt. The could be caused
by:
A. A wrapped cylinder head
B. A bent connecting rod
C. A bent crankshaft
D. A warped block deck - (ANSWERS)B. A bent connecting rod
(A bent connecting rod can cause the piston to travel in the cylinder in a
twisted fashion, resulting in a diagonal wear pattern on the piston skirt.)
A diesel engine equipped with a pump-line nozzle electronic (PLN-E) fuel
system has a single-cylinder misfire on cylinder #3. Which of the following
could be the cause?
A. Restricted fuel filter
B. Restricted air filter
C. Cracked delivery valve
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
Which of the following should be done after installing a new copper
injector sleeve?
A. Heat it
B. Dress it
C. Ream the seat
D. Coat it with a looking compound - (ANSWERS)C. Ream the seat
(This reaming ensures there will be a good clean area for the injector to seal
against)
A diesel engine has oil in the radiator. Which of the following would be the
cause?
A. Cracked piston cooling nozzle
B. Cracked oil cooler
C. Restricted turbocharger drain line
D. Restricted exhaust gas recirculation (EGR) cooler - (ANSWERS)B.
Cracked oil cooler
( A cracked oil cooler will allow the oil into the cooling system; thus, oil
would get in the radiator.)
A diesel engine has bubbles flowing in the clear bowl on the fuel/water
separator. Technician A says this is caused by a restricted fuel return line.
Technician B says this is caused by leaks on the return side of the fuel
system. Who is correct?
A. A only
,ASE Diesel Engines test T2 practice test 1 With Complete
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
B. B only
C. Both A and B
D. Neither A nor B - (ANSWERS)D. Neither A nor B
(Bubbles flowing the separator indicate an air leak on the suction side of the
fuel system.)
A truck has been sitting for 12 hours. Which of the following open-circuit
voltages would indicate a fully charged battery?
A. 11.6 volts
B. 12.0 volts
C. 12.6 volts
D. 13.0 volts - (ANSWERS)C. 12.6
(A fully charged battery should have an open-circuit voltage of 12.6 volts.)
The engine oil pressure gauge fluctuates greatly. All of the following be the
cause EXCEPT:
A. The oil pan is overfilled
B. The oil pickup tube is loose
C. The wrong engine oil was installed
D. The oil pressure sensor is failing - (ANSWERS)C. The wrong engine oil
was installed
( The incorrect oil may not provide proper lubrication, but it will NOT
cause great pressure fluctuations)
The engine brake will occasionally come on when pulling a hill. Technician
, ASE Diesel Engines test T2 practice test 1 With Complete
Questions And Verified Correct Answers 2025/2026 ,
Graded A+
A says the clutch switch may be faulty. Technician B says the master switch
may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - (ANSWERS)D. Neither A nor B
(If the engine brake engages while pulling a hill, the most likely problem is
with accelerator pedal position sensor.)
A piston has a diagonal wear pattern across the skirt. The could be caused
by:
A. A wrapped cylinder head
B. A bent connecting rod
C. A bent crankshaft
D. A warped block deck - (ANSWERS)B. A bent connecting rod
(A bent connecting rod can cause the piston to travel in the cylinder in a
twisted fashion, resulting in a diagonal wear pattern on the piston skirt.)
A diesel engine equipped with a pump-line nozzle electronic (PLN-E) fuel
system has a single-cylinder misfire on cylinder #3. Which of the following
could be the cause?
A. Restricted fuel filter
B. Restricted air filter
C. Cracked delivery valve
