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Cummins ISB 6.7L Turbo Assembly : OEM 3798331RX

CUMMINS ISB 6.7L TURBO ASSEMBLY : OEM 3798331RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$3,320.00

CORE CHARGE:

$1,200.00
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 NUMBER3798331RX
PART TYPETurbo Assembly
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISB 6.7L
YEAR
PART NUMBER3798332RM-WA
ADDITIONAL NOTESHE300

PRODUCT DESCRIPTION

This is a New, Tamerx Turbo Assembly, Tamerx part number 3798332RM-WA ( OEM Part Number 3798331RX ). This part is primarily made for a Cummins ISB 6.7L, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: HE300

OEM NUMBERS

Primary OEM 3798331RX
Additional OEM 3798331RX, 5494878

ADDITIONAL DETAILS

CONDITION New
UPC / Barcode 00840490547834
WEIGHT 3.00 LBS

SHIPPING OPTIONS

Ship Weight : 3.00 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 stronger performance with the Cummins ISB 6.7L Turbo Assembly – OEM 3798331RX, engineered to breathe new life into your engine. This turbo assembly boosts airflow for improved power delivery and smoother acceleration under load. Built to meet OEM quality standards, it offers a direct-fit swap with the durability your rig demands. Upgrade to reliable turbo performance and feel the difference on every mile.

PEOPLE ALSO ASKS | BLOG(S)

A turbo assembly is one of the most important components in a diesel engine’s air intake system, helping your engine achieve better combustion and power delivery. The Cummins ISB 6.7L Turbo Assembly (OEM 3798331RX) is designed to provide the correct amount of boost pressure and airflow needed for efficient engine operation. Choosing the correct OEM-grade turbo assembly ensures consistent performance, improved responsiveness, and reliable operation across a wide range of driving conditions.

This turbo assembly has a direct impact on how your engine performs — here’s why it matters:

  • Optimizes Boost Pressure – Helps compress incoming air to increase oxygen supply for stronger and more efficient combustion.

  • Improves Engine Responsiveness – Accurate boost control reduces lag and supports steady throttle response under load or during acceleration.

  • Enhances Fuel Efficiency – Proper airflow and boost levels help the engine burn fuel more completely, contributing to better fuel economy and cleaner operation.

  • OEM-Grade Fit and Durability – As OEM 3798331RX, this turbo assembly meets original manufacturer specifications for fit, airflow characteristics, and long-lasting performance.

  • Protects Engine Components – Maintaining the correct air-to-fuel balance reduces stress on internal engine parts, helping promote smoother operation and extended engine life.

A worn or failing turbo assembly can lead to reduced power, increased exhaust smoke, and diminished fuel efficiency. The Cummins ISB 6.7L Turbo Assembly (OEM 3798331RX) delivers the reliable performance and OEM-standard quality your engine depends on — helping keep your diesel running strong, smooth, and efficient. For customers seeking a dependable replacement component, Tamerx offers high-quality turbo assemblies designed to support consistent performance and long-term engine health.

Installing a new turbo assembly is an important step in restoring proper engine operation, but the break-in period is just as critical. Following the right procedures after installation helps ensure proper lubrication, reduces early wear, and supports long-term reliability of the turbocharger.

  • Prime the turbo with oil before startup: Ensure the turbocharger is properly lubricated before starting the engine to prevent dry startup damage.

  • Check oil supply and return lines: Make sure oil lines are clean, properly installed, and free of restrictions or leaks.

  • Allow the engine to idle initially: Let the engine idle for several minutes after first startup to stabilize oil pressure and circulation.

  • Avoid hard acceleration early on: Drive gently during the first few hundred miles to allow internal components to seat properly.

  • Monitor oil levels and condition: Verify correct oil levels and use manufacturer-approved oil to support consistent lubrication.

  • Let the turbo cool down: After driving, especially under load, allow the engine to idle briefly before shutdown to prevent heat-related damage.

Properly breaking in a new turbo assembly helps reduce the risk of premature wear and failure. By following careful startup and driving practices, vehicle owners can support smooth turbo operation and extend the service life of this critical engine component.

Wear can result from poor lubrication, dirty oil, abrasive particles, or foreign debris entering the intake. Maintaining clean engine fluids and filters helps protect internal turbo components.

A properly functioning turbo helps the engine burn fuel more efficiently, which can support better fuel economy under typical driving conditions. Reduced airflow due to turbo issues may increase fuel consumption.

Typical symptoms include loss of boost pressure, unusual whining noises, black or blue smoke, and reduced acceleration. These signs suggest internal wear or leakage within the turbo.

It’s recommended to inspect the turbo assembly during routine service intervals, such as oil changes or performance checks. Timely inspection can catch early wear and prevent further engine issues.

Cummins Turbo Assemblys

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