The possibility of a diesel engine crankcase explosion will be increased by operating an engine __________.
Official USCG Answer & Rule Citation
Correct Answer: Option B — with a leaking crankcase inspection cover gasket
A leaking crankcase inspection cover gasket allows ambient air to be drawn into a negative-pressure crankcase or alters internal air-fuel vapor ratios. Introducing localized oxygen paths near heated journal surfaces drastically escalates the potential for a severe crankcase explosion.
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