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單項選擇題

Blow-off of the relief valves of the main cylinders during operation indicates （）.

A.the cylinder cover is cracked
B.the injector holes is clogged
C.the cams are not properly set
D.fuel pump is leaking

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單項選擇題

Blow-off of the relief valves of the engines cylinders may be caused by （）.

A.too low lead
B.water in fuel
C.too tight spring
D.leakage

單項選擇題

Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.

A.the indicators
B.the starting valves
C.the cylinder lubricators
D.the turning gear

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