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Cummins QSM11 Turbo Assembly 2003-2009: OEM 4089856RX

CUMMINS QSM11 TURBO ASSEMBLY 2003-2009: OEM 4089856RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$2,450.00

CORE CHARGE:

$500.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER4089856RX
PART TYPETurbo Assembly
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSM11
YEAR2003-2009
PART NUMBER4089856RM
ADDITIONAL NOTESHX55

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Turbo Assembly, Tamerx part number 4089856RM ( OEM Part Number 4089856RX ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins QSM11, production years 2003-2009, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: HX55

OEM NUMBERS

Primary OEM4089856RX
Additional OEM4037086, 4037087H, 4089856RX

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490541900
WEIGHT51.00 LBS

SHIPPING OPTIONS

Ship Weight : 51.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Unleash the power your Cummins QSM11 deserves with the Turbo Assembly 2003–2009 – OEM 4089856RX — precision-balanced for peak boost, efficiency, and longevity. Expertly remanufactured to deliver OEM-grade performance, this turbo helps restore responsiveness, reduce lag, and maximize horsepower across the rpm range. Fit it in, fire it up, and feel your engine roar back to life.

FITMENT CHART

YEARMAKEENGINE(S)
2003Cummins QSM11
2004Cummins QSM11
2005Cummins QSM11
2006Cummins QSM11
2007Cummins QSM11
2008Cummins QSM11
2009Cummins QSM11

PEOPLE ALSO ASKS | BLOG(S)

When your engine is a Cummins QSM11 (model years 2003–2009), the turbocharger is more than a performance booster—it’s a vital component in maintaining airflow, combustion balance, and longevity. The OEM 4089856RX turbo assembly is built specifically for this engine family, designed to match its airflow needs, tolerances, and duty cycles. Installing the correct turbo assembly is critical; a substandard or mismatched one can lead to poor boost, black smoke, increased fuel consumption, and even engine damage.

  • Precisely matches the flow requirements of the QSM11, ensuring proper boost levels across rpm

  • Maintains correct turbine and compressor wheel tolerances for efficient operation

  • Helps prevent turbo lag, overboost or underboost, and erratic boost behavior that plagues mismatched units

  • Engineered to OEM spec, reducing thermal stress, vibration, and maintaining reliability

  • Helps preserve emissions compliance by ensuring the engine gets the proper air to burn the fuel cleanly

  • Comes fully balanced and tested to minimize vibration, shaft play, and premature wear

If your QSM11 is showing symptoms like slow spool, smoke, or inconsistent boost, the turbo is high on the suspects list. Replacing it with the OEM 4089856RX turbo assembly gives you a foundation of reliability, restores the engine’s breathing capability, and reduces the risk of surprises down the road. In the life of a diesel engine, the right turbo choice can define the difference between short-lived fixes and long-term durability.

The turbocharger is designed to boost engine efficiency and power by forcing extra air into the combustion chamber. While built for durability, a turbo assembly can wear out or fail over time. Understanding the common causes of turbo failure can help operators prevent problems and extend the lifespan of this critical component.

Common Causes of Turbo Assembly Failure

  • Poor Lubrication
    Lack of clean engine oil or low oil pressure can starve the turbo of lubrication, leading to bearing wear or seizure.

  • Oil Contamination
    Dirt, debris, or carbon particles in the oil can damage the turbo’s bearings and rotating parts.

  • Foreign Object Damage
    Small debris entering through the air intake or exhaust system can strike the blades, causing chips, cracks, or imbalance.

  • Excessive Exhaust Temperatures
    Overheating from prolonged heavy loads or poor engine tuning can damage the turbine housing and bearings.

  • Clogged or Dirty Air Filter
    Restricted airflow increases strain on the turbo and allows contaminants into the system.

  • Improper Maintenance
    Skipping oil changes, neglecting filter replacements, or using poor-quality fluids accelerates wear.

A turbo assembly usually fails due to issues that can be prevented with proper care. Clean oil, quality filters, and routine maintenance are key to keeping the turbo reliable. By addressing small problems early and following recommended service intervals, you can maximize turbo life and avoid costly repairs.

Disconnect intake and exhaust pipes, oil lines, blower housing, and unbolt the turbo from its flange or bracket.

Regular oil changes, clean air filters, proper warm-up and cooldown procedures, and avoiding contamination all help.

With proper care and use, it can last many thousands of hours or miles comparable to engine life.

A seized turbo can rupture housings, damage blades, or cause engine failure due to oil starvation or mechanical binding.

Cummins Turbo Assemblys

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