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單項(xiàng)選擇題

A diesel engine cylinder head can crack as a result of （）

A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves

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單項(xiàng)選擇題

In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）

A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance

單項(xiàng)選擇題

Diesel engine blow-by is the leakage of combustion gases past the （）

A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves