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单选题
Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
A
back clearance
B
side clearance
C
gap clearance
D
taper clearance
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单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
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compression ringsC
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cylinder liner sealing ring
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valve guidesB
oil control ringsC
valve seatsD
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backB
sideC
gapD
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单选题Diesel engine blow-by is the leakage of combustion gases past the （）A
oil rings onlyB
compression and scraper ringsC
cylinder liner sealingsD
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单选题In a diesel engine, blow-by（）A
increase exhaust back pressureB
causes excessive crankcase pressureC
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increase in engine speedB
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单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
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allow the engine to cool naturallyD
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单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
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单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
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