單項(xiàng)選擇題

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

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單項(xiàng)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

單項(xiàng)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