Description

The Cummins Rectangular Seal 3802363 is a precision-engineered diesel engine sealing component designed to provide a reliable, leak-free seal in lower-engine assemblies of Cummins diesel engines. This seal is a direct replacement for Cummins OEM part number 3903420 , making it ideal for lower gasket set service, engine rebuilds, and bottom-end repairs. Manufactured from OEM-grade sealing materials , this rectangular seal is built to withstand continuous oil exposure, pressure fluctuations, vibration, and temperature cycling common in heavy-duty diesel engine operation. The precision-molded rectangular profile ensures uniform sealing pressure across mating surfaces, helping prevent oil seepage and maintaining proper lubrication integrity. Designed for accurate fitment and long-term durability , the Cummins 3802363 rectangular seal helps protect internal engine components, maintain oil pressure stability, and reduce the risk of contamination caused by oil leaks. Replacing rectangular seals during a lower-engine overhaul is strongly recommended to ensure consistent sealing and avoid repeat repairs. This rectangular seal is commonly used as part of a lower gasket set or as a standalone replacement in Cummins diesel engine rebuild and lower-end repair applications , including on-highway trucks, industrial engines, and heavy-duty equipment.