Practice question

What is the purpose of the oil seal located on the engine's transmission output shaft?

To prevent gear oil from leaking past the countershaft sprocket into the environment
To isolate the transmission oil from the engine oil in unit-construction engines
To direct high-pressure oil into the hollow output shaft to lubricate the gears
To seal the combustion chamber from the crankcase

Answer: A — To prevent gear oil from leaking past the countershaft sprocket into the environment

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