ASE Diesel Practice Test Questions and
Answers
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...
(B) Low injection control pressure (C) High boost pressure
(D) Low boost pressure - Answer✔✔-B
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
A diesel engine with wet liners has been running too hot, and there is coolant in 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
Diesel engine cylinder liner protrusion (height) can be adjusted by selecting the correct size:
(A) cylinder liner.
(B) head gasket.
(C) liner shim.
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