單項選擇題

Diesel engine valve springs function to （）

A.hold the valves open
B.keep the valves off their seats until the exhaust stroke is completed
C.close the valves
D.open inlet valves when the air injection cycle begins

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單項選擇題

Worn diesel engine intake valve guides can result in （）

A.increased engine breathing efficiency
B.excessive valve lash
C.excessive lube oil consumption
D.lower than normal fuel consumption

單項選擇題

If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

A.Fuel
B.Lubricating
C.Cooling
D.Ignition