OEM equivalent 3026924 turbocharger assembly for Cummins NT855 NTC855

3026924 Holset HT3B T46 Turbocharger for Cummins NT855 NTC855 Engine

Brand: Topvelsun

Warranty: 6 Month

Turbo Model: T46 / ST-46 / HT3B

Cooling Type: Oil Cooled

Cross Number: 3026924, 3018067, 3801967, 3803279, 3529040

Application: Cummins NT855, NTC855 (14.0L) Diesel Engines

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Product Description

Premium 3026924 Holset Turbocharger for Cummins 14.0L NT855 Engines

The 3026924 turbocharger (built on the legendary Holset HT3B / T46 frame) is the definitive air-boosting solution for the Cummins NT855 and NTC855 14.0L heavy-duty diesel engines. Designed to deliver massive airflow and sustain high boost pressures (0.8–1.2 Bar), this OEM-equivalent replacement turbo instantly restores lost horsepower and fuel economy. It is widely equipped on heavy bulldozers like the Shantui SD32, as well as industrial Cummins power generator sets (NT855-GA, NTC855-G2) and marine applications.

Advanced Technical Specifications

Turbine & Compressor: Features a 9-blade forged aluminum compressor wheel (G2.5 dynamically balanced) paired with a 7-blade Inconel superalloy turbine capable of withstanding extreme 950℃ exhaust temperatures.
Bearing System: Fully floating journal bearings with a dedicated internal oil gallery for forced pressure lubrication (0.3–0.5 MPa).
Housing & Sealing: Durable ductile iron housing equipped with dual labyrinth seals and O-rings to completely eliminate oil blow-by.
Port Dimensions: Compressor inlet: φ130 mm | Compressor outlet: φ110 mm | Turbine inlet: φ140 mm | Turbine outlet: φ150 mm.

Equipment & Engine Compatibility

This turbocharger provides a direct, zero-modification bolt-on fit for the following heavy equipment:

Engine Platforms: Cummins NT855, NTA855, NTC855 series (14.0 Liter, 280–480 HP).
Heavy Earthmoving: Shantui SD32 Crawler Dozers, Hitachi EX400 Excavators (Cummins-powered versions).
Power Generation & Industrial: Cummins Gen-Sets (NT855-GA, NTC855-G2), oilfield fracturing trucks, and marine main engines.

Official Troubleshooting: Diagnosing Turbo Failure

According to the Topvelsun diagnostic team, applying a new turbo to a sick engine will only cause repeat failure. Verify these symptoms before replacing your 3026924 turbo:

Failure Symptom	Root Cause & Corrective Action
Massive Power Loss & Black Smoke	Diagnosis: The compressor wheel is damaged by debris (FOD) or the air filter is severely restricted. Inspect the φ130mm intake tract for tears or blockages before installing the new turbo.
Loud Screeching / Metal Scraping	Diagnosis: The floating bearings are ruined due to contaminated oil or oil starvation, causing the turbine to hit the housing. The turbo assembly must be replaced, and engine oil/filters flushed.
Oil Leaking from Exhaust or Intake	Diagnosis: The labyrinth seals have ruptured. Ensure the oil return line (M16×1.5) is not kinked or clogged, which causes crankcase pressure to force oil out of the turbo seals.

FAQ

Q: Is the 3026924 turbo interchangeable with the 3018067 or 3529040?
A: Yes. According to Cummins EPC data, 3018067, 3801967, and 3529040 are 100% direct-fit equivalents and superceded numbers for this HT3B/T46 frame turbocharger.

Q: Will this fit my marine NTA855 engine?
A: Generally, no. Marine variants like the NTA855 often require water-cooled turbine housings (like part numbers 3527046 or 3529030) for safety compliance in enclosed hulls. Please verify your exact CPL (Control Parts List) number before ordering.

Q: What is the installation torque for the exhaust flange?
A: The 6-point mounting bolts should be tightened evenly in a cross-pattern to 55–60 N·m to prevent exhaust leaks and housing warp.

Tags: cummins