Cummins 3925570 Vibration Damper Assembly

The Cummins 3925570 is a tuned vibration damper (harmonic balancer) engineered for the 8.3 liter C-series diesel engines. It utilizes a rubber-damped inertia ring construction to absorb torsional vibration generated by the crankshaft, protecting the crankshaft and front gear train from fatigue failure. This assembly integrates a 7-groove pulley for belt drive accessories. Primary application includes non-certified 6CT 8.3L industrial and automotive engines, as well as ISC, ISL, and QSC emission-certified platforms. The damper is a critical wear item requiring inspection at major overhaul intervals. OEM cross-reference includes Cummins 3922560. Aftermarket manufacturing part numbers include PAI 202026 and J925570. Unit weight is approximately 8.1 kg.