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

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

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