Description

The Cummins Valve Cover Gasket 3902666 is a high-quality diesel engine gasket designed to provide a leak-free seal between the valve cover and cylinder head in Cummins diesel engines. This gasket is a direct replacement for Cummins OEM part number 3931015 , making it ideal for valve cover service, upper-engine repairs, and complete engine rebuilds. Manufactured from OEM-grade sealing materials , this valve cover gasket is engineered to withstand constant oil exposure, heat cycling, and vibration common in heavy-duty diesel engine operation. The precision-molded design ensures consistent sealing pressure across the valve cover, helping prevent oil leaks, contamination, and premature gasket failure. Designed for accurate fitment and long-term durability , the Cummins 3902666 valve cover gasket helps maintain clean engine operation and protects surrounding components from oil seepage. Replacing the valve cover gasket during routine maintenance or engine repair is strongly recommended to ensure proper sealing and reduce downtime caused by leaks. This gasket is commonly used as part of an upper gasket set or as a standalone replacement in Cummins diesel engine rebuild and repair applications , including on-highway trucks, industrial engines, and heavy-duty equipment.