Oil Pump: Description and Operation

DESCRIPTION
The engine oil pump is a gerotor design mounted to the lower crankcase behind the engine front cover by three mounting bolts. Drive for the gerotor elements is provided by the clamp load of the harmonic dampener and bolt.

OPERATION
As the pump rotates, oil is drawn from the sump through the sump pickup to a channel cast into the lower crankcase. The oil is then directed to the pump inlet cavity on the lower crankcase front face. Oil compressed by the pump re-enters the lower crankcase distribution channel through the pump outlet cavity opposite the inlet. A portion of the pump output is diverted via an internal passage to the oil pump inlet to provide a pressure seal at the crankcase interface. The oil pump outlet channel in the lower crankcase routes the oil to the oil filter/cooler circuit connections on the (front left) side of the lower crankcase.