Holset 4089777 HX35 Wastegate Turbocharger Assembly

The Holset HX35W turbocharger assembly bearing part number 4089777 is a wastegate-equipped forced induction unit designed for Cummins B-series 5.9L diesel engines. It utilizes an integrated pneumatic wastegate actuator mounted on the turbine housing to regulate boost pressure and prevent over-speeding of the compressor wheel. The unit features a cast iron turbine housing with a T3 flange inlet and a 4-bolt compressor discharge outlet. The center housing rotating assembly (CHRA) is oil-cooled and lubricated via engine oil supply and drain passages. This turbocharger is calibrated for applications requiring a mid-frame compressor map suitable for 160-275 horsepower ratings. It serves as a direct replacement for Cummins OEM part numbers 4089777, 4035024, and 4035057. Primary applications include Dongfeng Tianlong heavy-duty trucks equipped with the Cummins 6BTAA160 engine and Komatsu PC200-6 and PC220-6 hydraulic excavators powered by the 6BTAA engine. The compressor wheel inducer diameter is approximately 54 mm with an exducer diameter of 73 mm. The turbine wheel diameter is approximately 60 mm. The turbine housing incorporates an internal wastegate passage for exhaust bypass control.