Cummins 4938765 Oil Seal Assembly

The Cummins 4938765 is a precision-molded radial lip oil seal engineered for installation at the camshaft front, crankshaft front, or oil pump cover positions on ISF series diesel engines. Constructed from high-temperature fluorocarbon (FKM) or nitrile (NBR) elastomer, it provides effective sealing of engine lubricating oil under dynamic shaft rotation. This component is critical for maintaining oil pressure and preventing contamination ingress in the front gear train. It serves as a direct OEM replacement for Cummins ISF3.8 and ISF2.8 engines equipped in Foton Aumark light trucks and Hyundai construction machinery. The seal design incorporates a garter spring to maintain consistent radial load on the sealing lip throughout the service interval.