4089821 HX55W Turbocharger Replacement for Cummins ISM Engines
4089821 HX55W turbocharger for Cummins ISM engines in Orion V and MCI D4500/J4500. Aftermarket replacement. Verify OEM refs 3777550, 4038532, 4039196 and engine application before ordering.
Orders without stock ship approximately 60 days after ordering. Estimated ship date if ordered today: .
Show more cross references
3777550 4038532 4039196Subtotal: US$ 268.00
Send an InquiryThe 4089821 HX55W turbocharger is an aftermarket replacement assembly for Cummins ISM engines, listed for Orion V transit buses and MCI D4500/J4500 motorcoaches. This unit serves as an aftermarket replacement application for OEM reference numbers 3777550, 4038532, and 4039196, supporting stable operation in heavy-duty transit and coach applications.
Key Specifications
- Part Number: 4089821
- Product Type: Turbocharger
- Turbo Model: HX55W
- OEM Reference Numbers: 3777550, 4038532, 4039196
- Packing Dimensions: 26 x 30 x 33 cm
- Gross Weight: 28 kg
- Image Availability: Not available
These specifications support initial identification and verification of the 4089821 HX55W replacement unit. Buyers should cross-reference the part number and OEM reference numbers against their specific Cummins ISM engine application to confirm the correct assembly configuration before placing an order.
Application & Compatibility
Source application path clues for buyer verification. These are source category/application paths, not confirmed fitment claims:
This HX55W turbocharger assembly is listed for Cummins ISM engines in Orion V transit buses and MCI D4500/J4500 motorcoaches. The application paths include:
- Orion Bus > Orion V > Orion V Transit Bus > CUMMINS ISM
- Motor Coach Industries > D4500 > D4500 Motorcoach > Commuter Coach > CUMMINS ISM
- Motor Coach Industries > J4500 > J4500 Motorcoach > CUMMINS ISM
- Orion Bus > Orion V > Orion V Transit Bus > CUMMINS ISM
- Motor Coach Industries > D4500 > D4500 Motorcoach > Commuter Coach > CUMMINS ISM
- Motor Coach Industries > J4500 > J4500 Motorcoach > CUMMINS ISM
These paths serve as reference clues for identification. Buyers should verify the specific engine code, production year, and OEM reference numbers (3777550, 4038532, 4039196) against their vehicle records to confirm the correct replacement application before ordering.
Technical Notes
The HX55W is a heavy-duty turbocharger model commonly associated with Cummins ISM engine applications. Technical verification should focus on the turbine housing flange type and bolt pattern, which must match the specific engine variant. Buyers should also confirm the compressor housing A/R ratio to ensure it aligns with the original HX55W specification. Incorrect ratios can affect boost performance and engine operation. For CHRA/core assemblies, balancing is critical to maintain stable operation and reduce vibration. Verify these technical details against OEM reference numbers 3777550, 4038532, and 4039196 before installation.
B2B Supply
LeadTurbo supports B2B buyers with volume pricing for the 4089821 HX55W turbocharger. Worldwide shipping is available for fleet parts buyers and distributors. Technical fitment support is provided to help verify part number, engine application, and OEM reference numbers before ordering. Contact our team for bulk inquiries or to confirm specific Cummins ISM engine configurations.
Product FAQ
Orion V and other product, brand and model names are the property of their respective owners and are used for reference and application-lookup only. LeadTurbo is not affiliated with or endorsed by Orion V.
Compatibility Verify part number 4089821, Cummins ISM engine code, vehicle application (Orion V, MCI D4500/J4500), production year, and OEM reference numbers 3777550, 4038532, 4039196 before ordering. Confirm turbo configuration and flange type with technical support.
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Frequently Asked Questions
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Complete Turbo Units
Complete turbo units designed for rigorous heavy-duty use where OEM units may fall short.
CHRA / Core Assemblies
Brand-new compatible CHRA cores — like-new performance at a fraction of replacement cost.
Turbine Wheels & Shafts
Precision-balanced turbine shafts engineered from inside out for superior durability.
Turbine Housings
Silicon-molybdenum (Si-Mo) nodular cast iron — engineered for extreme heat resistance.
Compressor Housings
OEM-matched geometry and surface finish — advanced casting and machining for perfect fitment.
Bearing Housings
Rock-solid platform engineered for high-output rebuilds — the foundation for performance.
Compressor Wheels
Aluminum, stainless steel, or titanium alloys — precision machined for superior responsiveness.
