Description

The Cummins Front Crankshaft Seal 3904353 is a precision-engineered diesel engine seal designed to prevent oil leakage at the front of the crankshaft , ensuring proper lubrication retention and clean engine operation in Cummins diesel engines. This seal is a direct replacement for Cummins OEM part number 3804899 , making it ideal for front cover service, lower-engine repairs, and complete engine rebuilds. Manufactured from high-quality elastomer sealing materials , this front crankshaft seal is engineered to withstand high rotational speeds, constant oil exposure, vibration, and extreme temperature fluctuations common in heavy-duty diesel engine operation. The precision-molded sealing lip maintains consistent contact with the crankshaft surface, reducing wear and providing long-lasting leak prevention. Designed for accurate fitment and reliable sealing , the Cummins 3904353 front crankshaft seal helps maintain proper oil pressure, protect internal engine components, and prevent contamination caused by oil loss. Replacing the front crankshaft seal during engine service or overhaul is strongly recommended to avoid future leaks and unnecessary downtime. This seal is commonly used as part of a lower gasket set or as a standalone replacement in Cummins diesel engine rebuild and front-end repair applications , including on-highway trucks, industrial engines, and heavy-duty equipment.