单项选择题
An increase in the fuel injection pump discharge pressure can be caused by a/an （）
A.leaking delivery valve
B.excessive bearing end play
C.plugged injector spray hole
D.increased plunger stroke
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相关考题
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An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）
A.graphite packing
B.sealing compound
C.lubricating oil
D.gaskets -
单项选择题
What is the function of the after-cooler installed in the diesel engine air intakes system?（）
A.Decrease the air density
B.Increase the exhaust temperature
C.Decrease the lube oil temperature
D.Increase the air density -
单项选择题
Which harmful consequence may be the result of lube oil sludge accumulation? （）
A.Clogged oil pump suction screens
B.Increased oil operating temperatures
C.Sticking piston rings
D.All of the above
