Buy wp20599 - Genuine Cummins HE300VG/HE341VE Turbocharger QSB 6.7L - 1 - wisentpartscenter.com

Description

Genuine Cummins 3793748NX Turbocharger is a Holset variable-geometry turbocharger used on Cummins QSB 6.7L industrial diesel engines. This service family includes earlier HE341VE configurations and later HE300VG replacements. The variable-geometry system changes turbine flow according to engine operating conditions, helping the engine build boost efficiently across a wide RPM and load range.

Key Functions

- Compresses intake air to provide the airflow required for engine power under load.
- Adjusts turbine geometry to improve boost response across the engine operating range.
- Works with the engine control system through the VG actuator and position-control system.
- Helps manage exhaust flow, engine response, and emissions performance.

Fitment & Specifications

- Engine Family: Cummins QSB
- Displacement: 6.7L
- Application Type: Industrial / Off-Highway
- Component Type: Variable Geometry Turbocharger
- Manufacturer: Holset / Cummins Turbo Technologies
- Turbo Families: HE341VE / HE300VG
- Fuel: Diesel
- Later Service References: 4352381, 5451857
- Variable Geometry: Yes
- Electronic VG Actuator: Application dependent within the family

Holset replacement catalogs group the extensive number family you supplied with the Cummins QSB 6.7L industrial application, while current genuine Holset replacement listings identify the later assembly as an HE300VG.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 3793748NX converts exhaust-gas energy into compressed intake air for the QSB 6.7L engine. Unlike a conventional fixed-geometry turbocharger, its variable turbine mechanism changes the effective exhaust passage according to engine demand, allowing quicker boost response at lower engine speed while maintaining airflow at higher load.

Issue Symptoms / When to Replace

A failing or sticking variable-geometry turbocharger can cause low boost, slow acceleration, loss of power under load, excessive smoke, abnormal turbo noise, or inconsistent boost response. Carbon buildup or mechanical wear in the variable-geometry mechanism can also prevent the vanes from moving through their proper range. Intake restrictions, charge-air leaks, exhaust leaks, actuator or position-sensor problems, and oil-supply faults can create similar symptoms and should be checked before replacing the complete turbocharger.

Brand Information

Holset is the turbocharger brand of Cummins Turbo Technologies. Cummins Turbo Technologies has more than 60 years of turbocharger engineering experience and develops turbo systems specifically for commercial and industrial diesel applications. Its HE300VG family uses variable-geometry technology designed to improve boost response, efficiency, and engine airflow over a broad operating range.

Installation Notes

Determine why the original turbocharger failed before installing the replacement. Inspect the intake, exhaust, aftercooler, oil supply and oil drain systems for contamination, blockage, damaged lines, or foreign material. Holset instructs technicians to pre-lubricate the turbo bearings with clean engine oil, verify clean oil and coolant passages, reconnect the VG actuator and sensors correctly, and complete any ECM/VG checks specified by the engine manufacturer before returning the engine to service.

How to Identify an OEM Part

A genuine 3793748NX can be identified by the Holset/Cummins manufacturer markings and the factory turbocharger dataplate showing the assembly part number, serial number, and turbo type. Holset states that the dataplate may be located on the VG actuator or compressor housing depending on the build configuration.

Why Buy 3793748NX From Wisent Parts Center?

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Warranty & Return Information
Warranty Information

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