单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

A.Control the amount of lube oil burned in the combustion chamber
B.Transmit heat from the piston to the cylinder liner
C.Prevent damage to ring groove inserts by acting as a heat dam
D.Dissipate combustion chamber gas pressure by channeling it through the ring gap