Description

The Cummins Top Gasket Set C4089819 is a complete upper-engine sealing solution designed to restore factory sealing integrity during cylinder head service and engine rebuilds. Manufactured to OEM specifications, this top gasket set includes the cylinder head gasket C3958645 , ensuring accurate fitment, reliable compression sealing, and long-term durability in Cummins diesel engines . Top gasket sets play a critical role in sealing combustion chambers, oil passages, and coolant circuits at the upper engine. The included C3958645 head gasket is engineered to withstand extreme combustion pressures and high operating temperatures while preventing oil and coolant cross-leakage. Precision-cut sealing surfaces and reinforced fire rings promote even clamping force and stable engine operation. The C4089819 top gasket set is commonly installed during cylinder head replacement, valve train service, upper overhauls, and complete engine rebuilds . Using a matched top gasket kit helps ensure consistent sealing across all upper-engine components, reducing the risk of leaks and premature failures. This gasket set is trusted by diesel technicians, fleet maintenance teams, and professional engine builders who require OEM-level quality and dependable performance. Included Component Cylinder Head Gasket: C3958645