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

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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

单项选择题

Exhaust pipes for separate diesel engines can be combined only when （）

A.space limitations prevent separately run pipes
B.the engines are small auxiliary units
C.they are arranged to prevent gas backflow to each engine
D.a waste heat boiler is installed

单项选择题

An increase in crankcase pressure generally indicates（）

A.worn connecting rod bearings
B.worn engine cylinder liners
C.high cylinder firing pressure
D.stuck spring-loaded manhole covers