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單項(xiàng)選擇題

A diesel engine piston crown can crack from （）

A.excessive piston to liner clearance
B.excessive dirt beneath the piston crown that reduces heat transfer
C.faulty nozzle spray
D.all of the above

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單項(xiàng)選擇題

Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

A.an increased flash point
B.higher lube oil pressures
C.an increased viscosity
D.lower lube oil pressures

單項(xiàng)選擇題

When a fuel injection nozzle overheats, which of the problems listed can be expected?（）

A.The fuel metering will vary
B.The fuel will explode
C.The cylinder head will crack
D.The engine will stop