单项选择题
Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）
A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure
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相关考题
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单项选择题
Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）
A.sludge
B.water
C.micro-organism growth
D.all of the above -
单项选择题
Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats -
单项选择题
A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）
A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs
