Description

The Cummins Front Crankshaft Seal 3904353 is a precision-engineered sealing component designed to prevent oil leaks at the front of the crankshaft in Cummins diesel engines . This seal is a direct replacement for Cummins OE part number 3804899 , ensuring OEM-correct fitment, sealing performance, and long-term reliability. Manufactured from high-quality, oil- and heat-resistant elastomer materials, this front crankshaft seal is built to withstand continuous rotation, engine vibration, and extreme operating temperatures common in heavy-duty diesel applications. The precision-molded sealing lip maintains consistent contact with the crankshaft surface, helping retain engine oil and prevent contamination. The Cummins 3904353 front crankshaft seal is commonly replaced during lower engine resealing, timing cover service, front cover removal, and complete engine rebuilds . Replacing a worn or leaking front crank seal is critical for maintaining oil pressure, protecting belts and accessories, and preventing premature engine damage. Supplied as one complete seal, this component is ready for professional installation and is commonly included in Cummins lower gasket sets.