單項選擇題

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

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單項選擇題

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

單項選擇題

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