Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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A substantial amount of water in the crankcase of a gasoline engine would most likely be caused by which of the following?

Fuel contamination
Condensation
Overheating
Oil leaks

The correct answer is: Condensation

The presence of a substantial amount of water in the crankcase of a gasoline engine is most likely attributed to condensation. This phenomenon occurs when warm, moist air enters the crankcase and cools down, resulting in water droplets forming. This is particularly common in engines that experience short trips or do not reach optimal operating temperatures regularly, as the engine may not get hot enough to evaporate the moisture that accumulates. Condensation can lead to significant operational issues, including dilution of the engine oil, corrosion of engine components, and potential failure if left unaddressed. In terms of comparison with the other options, fuel contamination typically involves fuel mixing with oil due to leaks or malfunctions, while overheating generally leads to oil breakdown rather than water accumulation. Oil leaks refer to the loss of oil, which can be caused by seals or gaskets failing, but do not contribute to the presence of water in the crankcase.