單項選擇題

If a diesel engine is smoking excessively under load, the cause could be （）

A.low exhaust back pressure
B.early fuel injection in one of the cylinders
C.compression pressure in one of the cylinders
D.plugged injector holes

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單項選擇題

A diesel engine emits blue exhaust smoke as a result of（）

A.cold intake air
B.excessive compression pressure
C.excessive cylinder lubrication
D.a light load

單項選擇題

Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）

A.grinding the spare plunger to the barrel
B.replacing the plunger and the barrel
C.highly polishing both the plunger and barrel
D.replacing plunger only