Description

The Cummins Front Crankshaft Seal C3904353 is a premium OEM-spec sealing component designed to prevent engine oil leaks at the front of the crankshaft in Cummins diesel engines . Manufactured to precise factory tolerances, this seal ensures a tight, durable seal where the crankshaft exits the front cover, protecting critical engine components and maintaining proper oil pressure. Front crankshaft seals are subjected to constant rotation, vibration, and high temperatures. The C3904353 seal is produced from high-quality, oil- and heat-resistant elastomer materials engineered to withstand continuous operation in heavy-duty diesel environments. The precision-formed sealing lip maintains consistent contact with the crankshaft surface, reducing wear and preventing oil seepage. This seal is commonly replaced during front cover service, timing gear or damper removal, lower engine resealing, and complete engine rebuilds . Replacing a worn front crank seal helps prevent oil contamination of belts, dampers, and surrounding components while extending overall engine life. The Cummins C3904353 front crankshaft seal is trusted by diesel technicians, fleet maintenance teams, and engine builders who require OEM-level reliability and long-term leak prevention.