Cummins 3908511 Fuel Injector Assembly

The Cummins 3908511 fuel injector assembly is designed for the 6CT 8.3L and C Series diesel engines utilizing Bosch-type injection systems. This component delivers precise fuel metering and atomization required for optimal combustion efficiency in heavy-duty applications. The injector body is manufactured from high-strength alloy steel with hardened nozzle needle valves to withstand extreme cylinder pressures and thermal cycling. Technical specifications include a multi-hole nozzle configuration calibrated for the 6CT 8.3L displacement rating. The assembly is compatible with mechanical fuel injection pumps (P-pump) and early CAPS electronic systems found in 6CT, 6CTA, ISC, and QSC engine variants. Critical wear surfaces are precision ground to maintain sealing integrity at opening pressures typically ranging between 25 to 30 MPa. This unit serves as a direct replacement for OEM part numbers 3908511 and 3926779. Cross-reference interchangeability covers a wide range of aftermarket and OEM part numbers including 3802098, 3802065, 3911350, 3908507, 3926787, and 3802648. Primary applications span Dongfeng commercial trucks (Tianlong, Dali Shen, 145 series), JAC heavy-duty trucks (Shuailing, Junling series), and construction machinery such as wheel loaders, scrapers, and bulldozers equipped with Cummins 8.3L powerplants.