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As soon as the engine starts turning over, and it works until you turn the engine off.

ClarificationThe oil pump is driven directly off the camshaft or the crankshaft (depending on the manufacturer), and whenever the engine is running, the oil pump pulls oil out of the crankcase and sends pressurized oil through the oil "journals" of the engine.

All of the rods, mains and camshaft bearings float on a thin film of pressurized oil. Technically, none of those bearings should ever come in contact with the metal of the crankshaft or camshaft.

If the oil pump STOPS functioning while the engine is running, the bearings mentioned will come in contact with the crankshaft and/or camshaft, and deteriorate and fail in a short time.

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13y ago
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15y ago

Whenever the crankshaft is turning

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Q: When is the engines oil pump in use?
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