HEAVY TRUCK ASE Diesel Practice Test.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20A
HEAVY TRUCK ASE Diesel Practice Test
1. When a diesel engine is operated under a load, coolant continually comes out of the
radiator overflow and there are bubbles in the radiator. Which of these is the most likely
cause?
(A) Too much coolant in the cooling system
(B) A clogged radiator
(C) A stuck-open thermostat
(D) Compression leakage into the cooling system
Answer D
2. A diesel engine has excessive black smoke when started in the morning. Which of
these could be the cause?
(A) A bad fuel injection nozzle
(B) A restricted fuel filter
(C) A blocked fuel tank vent
(D) A leaking fuel return line
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,HEAVY TRUCK ASE Diesel Practice Test.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20A
Answer A
3. Which of these can cause a no-start condition on a HEUI engine?
(A) High fuel pressure
(B) Low injection control pressure (C) High boost pressure
(C) Low boost pressure
Answer B
4. A diesel engine is hard to start, but runs good after it has been primed and run for a
few minutes. The most likely cause is a
(A) leaking injector line.
(B) leaking fuel return line.
(C) plugged fuel tank vent.
(D) bad transfer pump check valve.
Answer D
5. A diesel engine with wet liners has been running too hot, and there is coolant in
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,HEAVY TRUCK ASE Diesel Practice Test.pdf file:///C:/Users/HP/Desktop/New%20fo/HEAVY%20TRUCK%20A
the crankcase. The most likely cause is
(A) a cracked block.
(B) cracked liners.
(C) leaking liner seals.
(D) a leaking injector seal.
Answer C
6. Diesel engine cylinder liner protrusion (height) can be adjusted by selecting the correct
size
(A) cylinder liner.
(B) head gasket.
(C) liner shim.
(D) fire ring.
Answer C
7. An electronically-controlled diesel engine will not start. Any of these could be the cause
EXCEPT a failed
(A) camshaft position sensor.
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