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單項選擇題

An increase in diesel engine crankcase pressure generally indicates excessive（）

A.compression pressure
B.lube oil header pressure
C.scavenge air pressure
D.piston ring blow-by

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單項選擇題

You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）

A.large dirt particles in the oil supply
B.insufficient lubricating oil and overheating
C.normal wear
D.water contamination of the lube oil

單項選擇題

A substantial increase in crankcase pressure could be an indication of （）

A.excessive lube oil pressure
B.the proper seating of new rings
C.a worn cylinder liner
D.a malfunctioning cylinder relief valve

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