单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A.starting the engine while hot
B.knurling the piston skirt
C.operating the engine overheated
D.scuff resistant piston rings
