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單項選擇題

A drop in compression pressure in one cylinder of a diesel engine can be caused by（）

A.a leaking fuel injection nozzle
B.a clogged air filter
C.early fuel injection
D.burned valves

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單項選擇題

If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke

單項選擇題

Low cylinder compression pressure and a high exhaust temperature may indicate （）

A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature

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