Cummins 3160925 Crankshaft Rear Oil Seal

The Cummins 3160925 is a crankshaft rear oil seal engineered for high-speed, high-temperature diesel engine environments. It utilizes fluorocarbon (Viton) lip material to resist thermal degradation and chemical attack from synthetic lubricants. The seal features a precision-ground metal case and a spring-loaded sealing lip to maintain consistent radial force on the crankshaft journal. This component is a direct replacement for Cummins OEM part numbers 3160925 and 3099421. It is applicable to the K19, KTA19, QSK19, and KTA38 engine series commonly deployed in marine propulsion, power generation, construction machinery, and mining equipment. The superseded aftermarket reference A3870890 replaces A3160925 upon stock depletion. Installation requires standard seal driver tools and clean crankshaft surface preparation to prevent leakage.