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Cummins B6.7 SCR 2018-2024: OEM 4394690

CUMMINS B6.7 SCR 2018-2024: OEM 4394690

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

AVAILABILITY IN STOCK
OEM NUMBER4394690
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEB6.7
YEAR2018-2024
PART NUMBER4394690RM-SCR
APPLICATION NOTESNavistar 200-260 EPA21

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 4394690RM-SCR ( OEM Part Number 4394690 ). 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 B6.7, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394690
Additional OEM4394690

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490551930
WEIGHT75.00 LBS

SHIPPING OPTIONS

Ship Weight : 75.00 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.


Clean up your exhaust and boost performance with the Cummins B6.7 SCR 2018–2024: OEM 4394690, designed to tackle NOx emissions while supporting smoother engine operation. This genuine SCR module is built to meet strict OEM standards, ensuring a reliable fit and long-lasting durability across B6.7 applications. Engineered for dependable performance on the road, it helps keep your truck compliant with emissions regulations. Count on a part that helps your diesel run cleaner and stronger, mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins B6.7
2019Cummins B6.7
2020Cummins B6.7
2021Cummins B6.7
2022Cummins B6.7
2023Cummins B6.7
2024Cummins B6.7

PEOPLE ALSO ASKS | BLOG(S)

Keeping your truck’s emission control system in proper working order isn’t just about compliance; it’s about reliability and peace of mind on every mile. The Cummins B6.7 SCR 2018–2024: OEM 4394690 is an important Selective Catalytic Reduction (SCR) component designed to reduce harmful nitrogen oxides (NOx) in your exhaust. Understanding how this SCR unit functions and the value of regular emission system maintenance can help you avoid unexpected issues and keep your truck operating cleanly.

  • Specifically engineered for Cummins B6.7 engines from 2018 through 2024, the OEM 4394690 SCR unit fits directly into the emission aftertreatment system for precise compatibility.

  • The SCR system works by injecting diesel exhaust fluid (DEF) into the exhaust stream, where a controlled reaction converts NOx into harmless nitrogen and water vapor.

  • A clean, functioning SCR unit supports accurate DEF dosing, which is essential for efficient NOx reduction and helps prevent unnecessary DEF waste.

  • Regular checks of your SCR system can help identify issues early, such as DEF contamination, sensor irregularities, or buildup that may affect NOx conversion.

  • Using the genuine OEM 4394690 SCR ensures you’re installing a part built to the original manufacturer’s specifications, reducing the likelihood of fitment problems and false emission fault codes.

  • Keeping the SCR unit and related components well-maintained helps avoid emission-related warning lights, diagnostic trouble codes, or engine derates that can interrupt daily operation.

  • Robust OEM construction withstands the heat and vibration typical of highway and regional trucking, making it suitable for everyday use.

  • Scheduling SCR inspection as part of routine maintenance helps extend the life of the emission system and supports more reliable truck operation.

Choosing the Cummins B6.7 SCR 2018–2024: OEM 4394690 from Tamerx Diesel Parts means you’re investing in a quality emission control component built for your engine’s exact requirements. With regular SCR system attention and the right replacement parts, you’ll keep your truck compliant, dependable, and ready to work mile after mile.

 

The Selective Catalytic Reduction (SCR) system plays an essential role in reducing nitrogen oxide (NOx) emissions in modern diesel engines. Although the SCR catalyst is built for long-term durability, routine inspections are important to ensure the entire system continues operating properly. Regular checks can help prevent warning lights, engine derate, and costly aftertreatment repairs.

  • The SCR system should be inspected during scheduled maintenance intervals, typically aligned with routine engine service.

  • DEF levels should be checked regularly and topped off as needed to prevent low-fluid faults.

  • DEF quality should be monitored to ensure clean, manufacturer-approved fluid is being used.

  • Inspect the DEF injector for crystallization or buildup that may restrict proper dosing.

  • Scan for diagnostic trouble codes, even if warning lights are not currently illuminated, to catch early signs of sensor or efficiency issues.

  • Vehicles operating under heavy loads or severe conditions may benefit from more frequent inspections.

Routine SCR inspections help identify small issues before they become major problems. Staying proactive with maintenance ensures proper emissions control, supports reliable engine operation, and extends the lifespan of the aftertreatment system.

Ignoring early warning signs may lead to recurring fault codes and increased downtime. Extended neglect can also contribute to more costly aftertreatment repairs.

A properly functioning SCR system supports stable emissions performance and smoother engine behavior. Consistent maintenance helps preserve reliability and reduce unexpected service interruptions.

Leaving persistent faults unresolved can lead to recurring warning lights and reduced vehicle reliability. Early service keeps the aftertreatment system working properly and minimizes downtime.

Professional installation ensures proper alignment and secure connections for sensors and mounts. This reduces the risk of leaks, misreads, and diagnostic problems.

Cummins SCRs