单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.Leaking fuel injectors
B.Lower than normal compression
C.Delayed fuel injection
D.All of the above are correct