单项选择题
Excessive lube oil consumption can result from worn or broken（）
A.piston rings
B.valve guides
C.valve seals
D.all of the above
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相关考题
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单项选择题
In an operating diesel engine, pre-ignition can be caused by （）
A.excessively late fuel injection
B.oil in the air charge
C.water in the fuel
D.injection continuing after the fuel charge is ignited -
单项选择题
One cause of diesel engine surging can be a result of （）
A.injection pump plungers stuck or worn
B.low compression
C.solenoid stuck open
D.fuel tank too full -
单项选择题
Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A.facilitate bi-directional operation
B.provide the greatest pump efficiency
C.prevent pump clogging from marine growth
D.prevent cavitation at the pump outlet
