Description

The Holset 4031131H turbocharger is engineered for heavy-duty Mack and Volvo diesel engines, including Mack MP7, MP8, and Volvo D11 and D13 platforms. Built to OEM standards, this turbocharger delivers stable boost pressure, efficient airflow, and long-term durability under extreme operating conditions. Featuring a precision-balanced rotating assembly, high-temperature turbine housing, and reinforced bearing system, this unit ensures reliable performance in highway, vocational, and fleet applications. It restores original engine response, towing power, and fuel economy while maintaining emission-system compatibility. Designed as a direct-fit replacement for part numbers 21071163 and 21111305 , this turbo installs without modification and is ideal for engine rebuilds, fleet maintenance, and performance restoration. Product Features & Components OEM-spec Holset turbocharger assembly Precision-balanced turbine and compressor wheels High-temperature resistant turbine housing Heavy-duty bearing and sealing system Optimized airflow for modern diesel engines Factory-matched boost characteristics Direct bolt-on installation Built for long service life in commercial duty Engine Compatibility Mack MP7 Mack MP8 Volvo D11 Volvo D13 Vehicle Applications Mack highway and vocational trucks Volvo heavy-duty trucks Fleet and commercial transport vehicles Long-haul and regional haul applications (Exact models depend on engine configuration using the listed part numbers.) Key Features & Benefits Restores factory boost and airflow Improves throttle response and torque Enhances fuel efficiency Supports emission-compliant operation Reduces turbo lag OEM-level reliability Direct replacement fit Designed for heavy-duty cycles OEM / Reference Part Numbers 4031131H 21071163 21111305   Frequently Asked Questions What engines use the Holset 4031131H turbocharger? This turbocharger is used on Mack MP7, Mack MP8, Volvo D11, and Volvo D13 diesel engines. Which part numbers does this turbo replace? It replaces OEM part numbers 21071163 and 21111305. Is this a direct replacement turbo? Yes, the 4031131H turbocharger is a direct-fit replacement and installs without modification. Will this turbo restore engine performance? Yes, it restores factory boost pressure, torque output, and throttle response. Is this suitable for fleet and commercial use? Yes, it is designed for heavy-duty commercial and fleet applications. Is professional installation recommended? Professional installation is recommended to ensure correct oil priming and long-term reliability.