Cummins 4059170 Valve Camshaft Assembly

The Cummins 4059170 valve camshaft is a critical valve train component designed for the dual overhead cam (DOHC) configuration of the ISX15, QSX15, and X15 15-liter engine platforms. Manufactured from forged alloy steel with induction-hardened bearing journals and cam lobes exceeding 60 HRC, it provides high fatigue resistance and wear durability under high combustion pressures. This camshaft controls the intake and exhaust valve events for the valve-side camshaft in the dual-cam architecture. It is a direct replacement for Cummins OEM part numbers 3680779, 4059331, and 4298626. The component undergoes precision grinding and polishing to maintain strict lobe profile tolerances and surface finish requirements for optimal valve lift and duration. Applications span on-highway heavy-duty Class 8 trucks equipped with ISX15 engines and off-highway construction machinery such as excavators and wheel loaders powered by QSX15 industrial engines.