Holset 5555169 HE300WG Turbocharger Assembly

The Holset HE300WG is a single-stage wastegate turbocharger designed for medium-duty diesel engines in the 4.5L to 8.9L displacement range. It features a pneumatically actuated wastegate valve for precise boost pressure control across the operating map. The compressor and turbine wheels are optimized for high-efficiency airflow and durability under heavy-duty cyclic thermal loads. The bearing housing integrates water-cooling passages for enhanced thermal management of the rotor assembly. This unit serves as a direct OEM replacement for Cummins ISDe 4.5/6.7L and ISLe 8.9L engines configured to China National VI (Euro VI equivalent) emission regulations. The assembly includes the center housing rotating assembly (CHRA), compressor cover, turbine housing with integrated wastegate mechanism, and actuator. It is engineered to meet OEM specifications for rotor dynamic balance, axial/radial clearances, and boost response characteristics. Cross-reference part numbers include 5500363, 5500362, 5455210, and 5455211.