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
点击查看答案&解析
相关考题
-
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 -
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
