Cummins Turbocharger for QSB 5.9 Marine Engines

Technical Overview
This new turbocharger is engineered for Cummins QSB 5.9 marine engines. Built from high-temperature alloys and precision-balanced components, it restores designed boost, airflow, and fuel efficiency for reliable marine operation. Resistant to corrosion, heat, and vibration, it delivers long-lasting performance under continuous-duty conditions.

Detailed Features
Fully assembled and dynamically balanced to OEM specifications. Features a machined bearing housing, high-strength turbine shaft, and reinforced sealing system to prevent oil leaks. The wastegate actuator is pre-calibrated to Cummins QSB 5.9 boost mapping, ensuring optimal spool-up and stable power delivery. Each turbocharger is flow-tested and vibration-checked before shipment.

FAQ

1. Which engines does it fit?
Designed specifically for Cummins QSB 5.9 marine engines.

2. Is this a new or remanufactured unit?
This turbocharger is brand new — not remanufactured.

3. Does it include the actuator or wastegate?
Yes, it comes complete with the wastegate actuator as required for QSB 5.9 configurations.

4. Are gaskets or lines included?
Gaskets, oil feed, and return lines are sold separately; Diesel Pro supplies compatible OEM-grade replacements.

5. Is priming required before installation?
Yes — always pre-lube the bearing housing with clean oil and confirm unobstructed oil flow before starting.

6. What warranty applies?
All new turbochargers include a 12-month warranty against manufacturing defects.

7. How can I identify which QSB engine my turbo fits (4.5, 5.9, 6.7, or 7.0)?
Check the engine dataplate or serial number (ESN) on the valve cover or block. Each QSB version uses a different turbo configuration and compressor size. Match your ESN with Cummins data or contact Diesel Pro’s technical team for verification.

Diesel Pro delivers reliable marine engine parts like this one, tested for durability and backed by a strong 12-month warranty.