Cummins QSB 6.7L Decomposition Reactor Tube 2014-2020: OEM A045S805
CUMMINS QSB 6.7L DECOMPOSITION REACTOR TUBE 2014-2020: OEM A045S805
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx Decomposition Reactor Tube, Tamerx part number 4329479RM-DECOMP ( OEM Part Number A045S805 ). 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 QSB 6.7L, production years 2014-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: 90 degree elbow
OEM NUMBERS
| Primary OEM | A045S805 |
| Additional OEM | A045S805 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490556539 |
| WEIGHT | 20.00 LBS |
SHIPPING OPTIONS
Ship Weight : 20.00 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.
Supporting efficient exhaust aftertreatment operation, the Cummins QSB 6.7L Decomposition Reactor Tube (2014–2020) OEM A045S805 is a critical component within the selective catalytic reduction (SCR) system. Designed to meet original equipment specifications, it ensures precise compatibility with Cummins QSB 6.7L engines across the specified model years. This decomposition reactor tube promotes the proper mixing and breakdown of diesel exhaust fluid (DEF) before it reaches the SCR catalyst, helping reduce nitrogen oxide (NOx) emissions and support emissions compliance. Constructed from durable, high-quality materials, it is engineered to withstand high temperatures and demanding diesel operating conditions. Ideal for technicians, fleet operators, and maintenance professionals, this OEM component helps maintain consistent aftertreatment system function and long-term reliability.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2014 | Cummins | QSB 6.7L | ||||
| 2015 | Cummins | QSB 6.7L | ||||
| 2016 | Cummins | QSB 6.7L | ||||
| 2017 | Cummins | QSB 6.7L | ||||
| 2018 | Cummins | QSB 6.7L | ||||
| 2019 | Cummins | QSB 6.7L | ||||
| 2020 | Cummins | QSB 6.7L | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins QSB 6.7L Decomposition Reactor Tube (OEM A045S805) is an essential part of the engine's aftertreatment system because it prepares Diesel Exhaust Fluid (DEF) for the Selective Catalytic Reduction (SCR) process. Designed for 2014–2020 QSB 6.7L engines, this component ensures DEF is properly vaporized and mixed with the exhaust stream before it reaches the SCR catalyst, allowing the emissions system to function efficiently.
Although it may look like a simple section of exhaust piping, the decomposition reactor tube performs a critical role in reducing harmful emissions.
Why is the Cummins A045S805 Decomposition Reactor Tube important?
- Promotes proper DEF decomposition
- The reactor tube provides the heat and environment needed for DEF to break down into ammonia, which is required for the SCR catalyst to reduce NOx emissions.
- Improves DEF and exhaust mixing
- Its internal design helps distribute DEF evenly throughout the exhaust stream, ensuring consistent chemical reactions.
- Supports effective NOx reduction
- Properly mixed ammonia allows the SCR catalyst to convert harmful nitrogen oxides into harmless nitrogen and water vapor.
- Helps reduce DEF crystallization
- By encouraging complete vaporization and mixing, the reactor tube minimizes the formation of DEF deposits that can restrict exhaust flow.
- Enhances aftertreatment system efficiency
- Proper preparation of DEF allows the SCR system to perform more effectively, supporting reliable emissions control.
- Contributes to emissions compliance
- The reactor tube is an important part of helping the engine meet modern diesel emissions standards.
Think of the Cummins A045S805 Decomposition Reactor Tube as the preparation chamber for the SCR system. Before harmful NOx emissions can be converted into harmless gases, DEF must be properly heated, vaporized, and mixed with the exhaust. This component makes that process possible, helping the entire aftertreatment system operate efficiently while supporting cleaner exhaust and dependable engine performance.
A turbo assembly is designed to provide a steady supply of compressed air to your engine, but as it begins to wear, you'll often notice changes in how your vehicle performs. Recognizing the warning signs early can help you avoid more extensive engine damage and costly repairs.
Because the turbocharger operates under extreme heat and high rotational speeds, even minor problems can quickly become major failures if left unattended.
Here are the most common signs of a bad turbo assembly:
- Noticeable loss of acceleration
- If your vehicle struggles to accelerate or feels less responsive than usual, the turbo may not be producing the boost pressure the engine requires.
- Excessive exhaust smoke
- Blue smoke may indicate oil leaking through worn turbo seals, while black smoke can suggest the engine isn't receiving enough air for efficient combustion.
- Whining, grinding, or rattling noises
- Unusual sounds coming from the turbocharger often indicate worn bearings, damaged compressor blades, or internal component failure.
- Higher-than-normal oil consumption
- A damaged turbo can allow engine oil to leak into the intake or exhaust system, causing oil levels to decrease more quickly.
- Check engine light
- Faulty boost pressure or airflow readings can trigger diagnostic trouble codes and illuminate the check engine light.
- Oil leaks around the turbocharger
- Oil residue around the turbo housing, oil lines, or charge air piping may indicate worn seals or internal damage.
- Inconsistent boost pressure
- Fluctuating turbo boost can cause hesitation, uneven acceleration, and inconsistent engine operation.
- Reduced fuel economy
- When the turbo isn't supplying enough compressed air, the engine may burn more fuel to maintain normal operation.
If you notice one or more of these symptoms, it's important to inspect the turbo assembly as soon as possible. Early diagnosis can help prevent complete turbo failure, protect your engine from secondary damage, and reduce overall repair costs.
Technicians typically inspect the reactor tube for DEF crystal buildup, exhaust leaks, internal restrictions, corrosion, or physical damage that could affect SCR system operation.
Yes. The A045S805 is manufactured to OEM specifications to ensure compatibility with the original exhaust routing, mounting locations, and aftertreatment configuration.
Yes. Proper sealing helps prevent exhaust leaks that could interfere with DEF decomposition and reduce the effectiveness of the SCR aftertreatment system.
By promoting proper DEF decomposition before the SCR catalyst, the reactor tube helps maintain consistent NOx reduction and supports reliable aftertreatment operation throughout the engine's service life.
Cummins Decomposition Reactor Tubes
