Question 79Motor Plants - QMED

The correct answer is B) with a leaking crankcase inspection cover gasket. A leaking crankcase inspection cover gasket can allow air to be drawn into the crankcase, increasing the possibility of a diesel engine crankcase explosion. This is because a leak in the crankcase can introduce additional air, creating an explosive air-fuel mixture. In contrast, the other options do not directly contribute to an increased risk of crankcase explosion. Specifically, option A is incorrect as a crankcase vacuum between 1.5" and 2" of water is within the normal operating range and does not indicate an issue. Option C is incorrect as a crankcase exhaust blower that vents to fresh air actually helps prevent the buildup of explosive gases. Option D is incorrect as cooler sea water temperatures do not directly impact the risk of crankcase explosion.