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ASE T1 Truck Gas Engine PrepQuestion 1 / 10

A medium-duty truck engine is experiencing low oil pressure at idle. Technician A says this could be caused by a worn oil pump. Technician B says this could be caused by excessive main bearing clearance. Who is right?

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✓ Correct answer: D. Both A and B Both worn oil pumps and excessive main bearing clearances can cause low oil pressure at idle. The worn pump would not produce sufficient pressure, while excessive bearing clearance allows oil to escape too quickly, reducing system pressure.

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