单项选择题
A.a clogged filter element B.excessive lube oil pump discharge pressure C.excessive lube oil flow D.excessively hot lube oil
In a closed cooling system for a turbocharged, four-str...
单项选择题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A.improper venting of the cooling system B.carrying the expansion tank water level too high C.a totally clogged impeller in the cooling water pump D.an incorrectly set cooling system temperature control
A dirty lube oil strainer can result in（）A.crankcaseB.l...
单项选择题A dirty lube oil strainer can result in（）
A.crankcase B.low lube oil temperature C.excessive oil consumption D.low bearing oil pressure
Differential needle valves used in fuel injectors are d...
单项选择题Differential needle valves used in fuel injectors are directly closed by（）
A.cam action B.spring force C.fuel oil pressure D.firing pressure
