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Cummins QSB 4.5L Turbo Assembly 2019-2023: OEM 5321670RX

CUMMINS QSB 4.5L TURBO ASSEMBLY 2019-2023: OEM 5321670RX

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$5,850.00

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 NUMBER5321670RX
PART TYPETurbo Assembly
BRANDCummins
ENGINE MAKECummins
ENGINE TYPEQSB 4.5L
YEAR2019-2023
PART NUMBER5321670RM
ADDITIONAL NOTESHE200VG

PRODUCT DESCRIPTION

This is a Genuine New, Cummins Turbo Assembly, Cummins part number 5321670RM ( OEM Part Number 5321670RX ).This part is primarily made for a Cummins QSB 4.5L, production years 2019-2023, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: HE200VG

OEM NUMBERS

Primary OEM 5321670RX
Additional OEM 5321670RX

ADDITIONAL DETAILS

CONDITION Genuine New
UPC / Barcode 00840490536241
WEIGHT 36.00 LBS

SHIPPING OPTIONS

Ship Weight : 36.00 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.


Installed on Cummins QSB 4.5L engines from model years 2019–2023, OEM 5321670RX is a turbo assembly designed to operate within the factory intake and exhaust system configuration. This unit is manufactured to OEM specifications to ensure accurate fitment and compatibility with existing engine components. Built from durable materials, it is suited for the operating temperatures and demands common in medium-duty diesel applications. The assembly supports consistent airflow management during normal engine operation. It is a reliable choice for fleet maintenance and targeted repair needs requiring dependable turbo system performance.

FITMENT CHART

YEARMAKEENGINE(S)
2019Cummins QSB 4.5L
2020Cummins QSB 4.5L
2021Cummins QSB 4.5L
2022Cummins QSB 4.5L
2023Cummins QSB 4.5L

PEOPLE ALSO ASKS | BLOG(S)

The Cummins QSB 4.5L Turbo Assembly 2019–2023: OEM 5321670RX is a complete turbocharger unit designed specifically for Cummins QSB 4.5-liter diesel engines used in industrial, agricultural, and construction equipment applications.

This turbo assembly is responsible for managing airflow into the engine by using exhaust energy to compress incoming air. As exhaust gases exit the engine, they flow into the turbine housing and spin a turbine wheel. The turbine is connected by a shaft to a compressor wheel on the intake side. When the turbine spins, the compressor draws in fresh air, compresses it, and forces it into the engine’s intake system.

OEM 5321670RX is engineered for 2019–2023 QSB 4.5L applications, ensuring proper fitment and compatibility with the engine’s control system and exhaust configuration. Depending on the specific configuration, the assembly may include a wastegate or variable geometry mechanism to regulate airflow based on engine load and operating conditions.

Key components of the turbo assembly typically include:

  • Turbine housing and turbine wheel
  • Compressor housing and compressor wheel
  • Center housing rotating assembly (CHRA)
  • Wastegate or airflow control mechanism

In summary, OEM 5321670RX is a critical airflow management component that supports efficient combustion, emissions compliance, and dependable operation in Cummins QSB 4.5L engines from 2019 to 2023.

Prolonging the lifespan of your turbo assembly starts with protecting its lubrication system and preventing excessive heat and contamination. Turbochargers operate at extremely high speeds and temperatures, so consistent maintenance is critical to long-term reliability.

The most important factor is maintaining clean, high-quality engine oil. The turbo relies on a constant supply of pressurized oil for lubrication and cooling. Dirty oil, incorrect viscosity, or restricted oil flow is the leading cause of premature turbo failure. Always follow recommended oil change intervals and use the proper oil specification for your engine.

Midway through routine maintenance, focus on these essential practices:

  • Change engine oil and filters on schedule
  • Inspect and replace restricted turbo oil feed and return lines
  • Allow the engine to idle briefly before shutdown after heavy load
  • Repair injector over-fueling issues promptly
  • Monitor exhaust temperatures and regeneration performance
  • Check for boost leaks in the charge air system

Proper air filtration is equally important. A damaged or clogged air filter can allow debris to enter the compressor housing, damaging turbine blades and causing imbalance. Additionally, unresolved DPF or exhaust restrictions can increase backpressure and stress the turbine side.

Most turbo failures result from oil starvation, contamination, overheating, or upstream engine issues—not normal wear. Consistent maintenance, proper warm-up and cool-down practices, and early correction of engine faults are the most effective ways to extend turbo assembly lifespan and avoid costly repairs.

It uses exhaust gases to drive the turbine and compress intake air for the engine’s combustion process.

Yes, the complete assembly includes the turbine housing, compressor housing, and center section.

Yes, wear or internal damage can result in reduced airflow efficiency and related operating issues.

New gaskets, seals, and proper oil feed and return fittings are typically recommended for correct installation.

Cummins Turbo Assemblys

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