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單項選擇題

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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單項選擇題

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

單項選擇題

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