Navistar/International Cummins ISB 6.7L DEF Head Unit
NAVISTAR/INTERNATIONAL CUMMINS ISB 6.7L DEF HEAD UNIT
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-13 ( OEM Part Number 2520609C1 ). 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: QLS DEF Header, 40 MICRON, 11"
OEM NUMBERS
| Primary OEM | 2520609C1 |
| Additional OEM | 2513378C1, 2514767C1, 2515899C1, 2520609C1 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540101 |
| WEIGHT | 8.00 LBS |
SHIPPING OPTIONS
Ship Weight : 8.00 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.
Emissions compliance is supported by the Navistar/International Cummins ISB 6.7L DEF Head Unit: OEM 2520609C1, a dependable component for managing diesel exhaust fluid in compatible equipment. Manufactured to OEM standards, this unit monitors fluid level, temperature, and quality to ensure consistent aftertreatment system performance. Its rugged build provides durability under demanding operating conditions, protecting both the exhaust system and overall engine efficiency. Choosing an OEM DEF head unit minimizes compatibility risks and ensures long-term reliability. This part is a proven solution for keeping Navistar Cummins-powered machinery running efficiently and without interruption.
PEOPLE ALSO ASKS | BLOG(S)
The DEF Head Unit, OEM part number 2520609C1, is a critical emissions component used in Navistar and International vehicles powered by the Cummins ISB 6.7L diesel engine. Often referred to as a “DEF tank header” or “multipurpose head unit,” this module is mounted directly onto the DEF tank and combines several essential monitoring and fluid control features into a single assembly.
Remanufactured versions are commonly available and often include a standard 11-inch header body, a 40-micron internal filter, and a one-year or one-million-mile warranty.
The DEF head unit performs several key functions:
- DEF Level Sensing
- Measures the amount of DEF fluid in the tank and relays that data to the engine control module to prevent running low or triggering engine derate.
- Temperature and Quality Monitoring
- Some versions include sensors that monitor DEF temperature and quality to ensure fluid integrity and system performance.
- Internal Filtration
- Includes a fine internal filter (usually 40 microns) to remove particulates, protecting sensitive components like the dosing injector and pump.
- Fluid Routing
- Manages suction and return flow of DEF between the tank and dosing system, keeping fluid circulating properly.
A functioning DEF head unit is essential for proper emissions control, preventing warning lights, power loss, or potential system failures. It ensures accurate DEF monitoring, clean fluid delivery, and smooth communication with the vehicle’s electronic systems.
Keeping this component in working condition helps extend the life of your aftertreatment system, maintain compliance, and reduce costly downtime.
The DEF (Diesel Exhaust Fluid) head unit is a key part of your vehicle’s emissions system. It monitors DEF levels, temperature, and fluid quality. When this unit begins to fail, it often shows early warning signs—if you know what to look for.
Watch for these common indicators:
- Inaccurate DEF level readings
- The gauge may show empty or full when the tank doesn’t match
- Frequent warning lights
- Messages like “Service DEF System” or “Poor DEF Quality” may appear without reason
- Unexpected system derates
- The vehicle may limit speed even when fluid levels are adequate
- Unusual DEF consumption
- You may notice more frequent refills than normal
- Check engine light
- Emissions-related codes may be stored in the ECU
- Temperature sensor errors
- If the unit can’t read DEF temperature properly, system behavior may change
If you see any of these symptoms, have the system inspected with diagnostic tools. In some cases, a sensor or connector may be the issue. If the head unit itself is the cause, replacement is usually the solution.
No, it must be replaced if it fails to function correctly.
Match your current unit’s part number with 2520609C1 to ensure compatibility.
Delays may cause emission faults, downtime, and failed inspections.
Yes, it is designed to withstand vibration, temperature changes, and heavy-duty use.
Cummins DEF Head Units
