HX55 4089754 4036892 Turbocharger for Cummins ISX Signature 450 15.0L
The HX55 (4089754 / 4036892) is the Holset fixed-geometry turbocharger for the Cummins ISX1 and ISX Signature 450 engine, a 15.0L Class 8 powerplant used in Freightliner, Kenworth T660/T800/W900, and other over-the-road trucks from 2004-2011. This is a non-EGR, non-wastegated, twin-scroll turbo — mechanically simple, with no electronic components. It is a different turbo from the HX55 (3536995) used on the smaller M11/ISM 10.8L engine. Same turbo model name, different internals sized for the 15.0L ISX. Our HX55 is built new with all new components, dynamically balanced, and ships with gaskets. We supply shops, fleets, and distributors.
Turbo Model
HX55 (fixed geometry, non-wastegated, twin-scroll)
OEM / Interchange Numbers
- 4089754
- 4036892
- 4036902
- 4036900
- 3590909
- 3591788
- 3595090
- 3800653
- 3800775
- 4024853
- 4025184
Application
2004-2011 Cummins ISX1 / ISX Signature 450 15.0L non-EGR; fixed geometry, non-wastegated
Service & Support
- 1-Year Unlimited-Mileage Warranty
- US Stock, Fast Dispatch
- Bulk Orders Welcome
- White-Label Support
- Fully Certified
Your Source for Quality Diesel Engine Parts
FAQ
The HX55 (4089754 / 4036892) fits the 2004-2011 Cummins ISX1 and ISX Signature 450 15-0L non-EGR engines. OE and interchange numbers include 4089754, 4036892, 4036902, 4036900, 3590909, 3591788, 3595090, 3800653, 3800775, 4024853, 4025184. If your number is not listed, send it with the old part's dataplate photo and we confirm the match before shipping.
No. Cummins used the HX55 model name on two different engines. The HX55 3536995 is for the M11/ISM 10-8L. This HX55 (4089754) is for the ISX 15-0L. They have different compressor and turbine sizing. Always match by part number.
No. This is a fixed-geometry turbo with no wastegate, no VGT, and no electronic components. Bolt on and go — no calibration needed.
The HX55 (this page) is oil-cooled and fits the ISX Signature 450 (450 HP). The HX55W (4046127) has a water-cooled bearing housing and fits the ISX Signature 600 (600 HP). Different turbos for different power ratings.
Brand new, 100% new components, dynamically balanced. Ships with gaskets. No core charge. One-year unlimited-mileage warranty.
Yes. US stock, volume pricing for shops, fleets, rebuilders, and distributors.
HX55 for Cummins ISX Signature 450: Fixed-Geometry Turbo for the 15L ISX
The ISX Signature 450 was one of the most popular Class 8 engines before VGT turbos took over. It ran a simple, reliable HX55 turbo with no electronic controls. When this turbo fails, it is a straightforward swap — but make sure you are ordering the right HX55, because Cummins used the same model name on two completely different engines.
HX55 for ISX (15.0L) vs HX55 for M11/ISM (10.8L)
Both are called HX55, but they are physically different turbos sized for different displacement engines:
| Detail | ISX HX55 (this page) | M11/ISM HX55 |
|---|---|---|
| Engine | ISX1 / ISX Signature 450, 15.0L | M11, ISM, ISME, 10.8L |
| Key part # | 4089754 / 4036892 | 3536995 / 3590044 |
| HP rating | 450 HP | 370-500 HP |
| Turbine housing | Twin-scroll, larger flow | Different scroll geometry |
Always match by part number, not just turbo model name. The part number is stamped on the turbo nameplate.
HX55 (450 HP) vs HX55W (600 HP) on the ISX
Cummins also used the HX55W on the ISX Signature 600 — the higher-HP version. The W stands for water-cooled bearing housing. The 450 HP HX55 on this page is oil-cooled only. If your truck runs the Signature 600, you need the HX55W (4046127), not this unit.
Common failure patterns
- Bearing wear — journal bearings wear after 400k-600k miles. Shaft play, oil past seals, rising EGT.
- Compressor erosion — dust and debris over hundreds of thousands of miles. Power drops gradually.
- Turbine housing cracks — thermal cycling on the twin-scroll housing. Exhaust soot at flanges, reduced boost.
- Oil seal failure — restricted drain tube or high crankcase pressure. Blue smoke, oil consumption.
Cross Reference Numbers
This turbocharger replaces the following OE and interchange numbers:
- 4089754
- 4036892
- 4036902
- 4036900
- 3590909
- 3591788
- 3595090
- 3800653
- 3800775
- 4024853
- 4025184
Related configuration: HX55 3536995 for M11/ISM and HX55W 4046127 for other configurations.
Installation and Care
- Find out why the old turbo failed before installing the new one. Oil starvation or contaminated oil will destroy the replacement the same way.
- Change the engine oil and filter. Flush or replace the oil feed line.
- Replace the oil drain gasket and inspect the drain tube for restrictions.
- Check the intake ducting and charge-air connections for leaks.
- Prime the turbo with clean oil before startup. No electronic calibration is required.
See our quality process for details.
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