单项选择题

A diesel engine crankcase ventilation system （）

A.prevents spark generation
B.removes combustible gases
C.determines the level of combustible gases
D.provides inert gas generation in crankcase

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单项选择题

Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）

A.free entry of air to the crankcase
B.water entering the crankcase while engine wash-downs are being performed
C.excessive oil leakage during periods of increased blow-by
D.sub-cooling internal components

单项选择题

If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will （）

A.open late and close early
B.open late and close late
C.fail to open when the engine is cold
D.fail to open at normal operating temperature

单项选择题

Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

A.camshaft beatings
B.main bearings
C.piston crowns
D.cylinder walls