Cummins 3689760 Valve Cover Assembly

This valve cover assembly serves as the upper enclosure for the valvetrain on Cummins QSX15, ISX15, and X15 15-liter heavy-duty diesel engines. Manufactured from die-cast aluminum alloy, it provides structural rigidity and thermal management for the rocker lever assembly. The casting features precision-machined mounting flanges for the fuel injector hold-downs, rocker lever housing bolts, and crankcase breather tube connections. It interfaces with the cylinder head via a dedicated rubber molded gasket (OEM 3104392 or 4026507) to ensure oil-tight sealing under operating pressures. The component is a direct replacement for Cummins OEM part numbers 3689760, 3689759, 3687085, 3685926, 3104387, 3687082, and 3104391. It is applicable across industrial, mining, and on-highway platforms utilizing the QSX15 power unit, including Terex mining trucks (TR45, TR50, TR60, TR70) and Hyundai excavators (R800LC-9). Installation requires torque-to-yield bolts and a new gasket to maintain clamping load integrity.