Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What causes splash lubrication in an engine?

The oil pump's pressure
The movement of the crank in the crankcase oil
The rear exhaust system
The action of the coolant flow

The correct answer is: The movement of the crank in the crankcase oil

Splash lubrication occurs due to the movement of the crank in the crankcase oil. As the crankshaft rotates, it displaces oil that is located in the oil pan or crankcase. This motion causes the oil to be splashed around and distributed throughout various engine components. This method of lubrication is particularly useful in areas where a pressurized system might not be as effective, ensuring that moving parts, such as bearings and gears, receive adequate lubrication to reduce friction and wear. The other options do not contribute to splash lubrication in the same way. The oil pump's pressure relates to pressurized lubrication systems, which operate differently by actively circulating oil through filters and galleries. The rear exhaust system is not involved in lubrication at all; instead, it deals with exhaust gases. The action of the coolant flow pertains to temperature regulation and does not influence the lubrication process. This understanding helps in recognizing how various engine systems operate and interact.