單項選擇題

If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

A.excessively late injection timing for each cylinder
B.incorrectly adjusted intake valve timing
C.incorrectly adjusted fuel injector
D.incorrectly adjusted intake valve clearance

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單項選擇題

Which of the diesel engine cylinder liners listed has internal cooling water passages?（）

A.Internally finned liner
B.Externally finned liner
C.Wet liner
D.Integral water-jacket liner

單項選擇題

Diesel engine lube oil can become contaminated as a result（）

A.the water produced during combustion
B.the sulfur in the fuel
C.unburned fuel oil
D.all of the above