Question 77Motor Plants - QMED

The correct answer is A) Crankcase explosion. The accumulation of oil vapors in the crankcase of a diesel engine can lead to a crankcase explosion. This is because the oil vapors can mix with air and create a flammable mixture, which can ignite due to the high temperatures inside the crankcase. This can result in a sudden and violent explosion, which can cause significant damage to the engine and potentially pose a safety hazard. The other options are incorrect because they do not directly address the hazard of a crankcase explosion. Option B (poor fuel economy) and Option C (reduced lubrication) are not directly related to the accumulation of oil vapors. Option D (combustion knock) is a different issue that is not caused by the accumulation of oil vapors in the crankcase.