Cummins 4089398 Turbocharger Assembly HE551V

The Cummins 4089398 is a genuine Holset HE551V variable geometry turbocharger (VGT) assembly designed for 15-liter Cummins ISX, ISX15, ISX04, and QSX15 diesel engines. This unit integrates the electronic actuator for precise boost control across the operating range. Technical specifications include a compressor housing clock angle of 290 degrees and a turbine housing clock angle of 140 degrees. Construction materials consist of high-temperature alloy steel turbine housing, aluminum compressor housing, and steel shaft wheel assembly with rubber seals. The unit weighs approximately 32.7 kg (72 lbs) and is supplied new in OEM packaging. OEM cross-reference includes Cummins part numbers 4089398NX (new exchange) and 4089398RX (remanufactured). Primary vehicle applications cover Volvo VNL, VHD, and FH series trucks alongside Mack Anthem, Pinnacle, and Granite models equipped with the 15L ISX platform. Verification via engine serial number (ESN) or vehicle identification number (VIN) is required prior to installation to ensure correct housing orientation and actuator calibration.