单项选择题
Valve cages are used on some large diesel engines to （）
A.reduce wear on the valve stem
B.permit the use of alloy valve seat materials
C.reduce heat transfer from the valve seat
D.facilitate valve removal for servicing
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相关考题
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单项选择题
If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）
A.place standby cooler in operation
B.reduce engine load
C.check thermostatic valve
D.clean sea water strainer -
单项选择题
Which of the following conditions can cause excessive lube oil consumption in a diesel engine?（）
A.Low lube oil temperature
B.Dirty lube oil strainer
C.Low lube oil pressure
D.High lube oil temperature -
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In the common rail system, excessive pressure in the header may be caused by （）
A.improper adjustment of the bypass valve
B.a dribble in the fuel injection nozzle
C.insufficient leak-off through injection nozzle packing
D.a malfunctioning injection nozzle
