You order a remanufactured turbocharger, fuel injector, or cylinder head, pay the core charge, and install the replacement. Your truck is getting back to work, and the old component is ready to ship back. But where does it go after that? A diesel core return can be the beginning of another part’s working life. Even when a component no longer works properly, some of its underlying pieces may still be suitable for recovery. Qualifying cores give remanufacturers a starting point for producing replacement parts.
Here’s a look at the journey: returned, inspected, remanufactured, tested, and back to work.
What Is a Diesel Core?
A core is the used component you remove when installing its replacement. In a remanufacturing program, that old part may have value because eligible pieces can be recovered, reconditioned, and reused.
Certain remanufactured diesel parts are sold with a core charge in addition to the part’s purchase price. That charge encourages the return of old components and helps maintain the supply of cores needed for remanufacturing. When you return an eligible core and it is approved under the applicable program, you can receive core credit.
The credit depends on the return requirements for your purchase. Sending back any old part does not automatically qualify you for a refund.
Step 1: The Core Is Returned
The process starts when you send back the component you replaced. Before boxing it up, check the instructions supplied with your order. The correct component, its completeness, its condition, and the return deadline can all affect eligibility for core credit.
Keep the old assembly together and save the packaging from your replacement until you know what is required. If you are unsure whether an attached piece should stay with the core, ask before removing or discarding it.
Before returning a core: Don’t throw away parts or pieces from the component you’re replacing. A missing piece could affect your core’s eligibility.
Step 2: The Core Is Inspected
Once received, the core is evaluated under the applicable return program. The inspection may check whether it matches the purchased part, whether required pieces are present, and whether there is visible damage such as cracks, broken housings, or other major physical damage.
A failed part is not automatically a worthless core. The purpose of the inspection is to determine whether it meets the program’s acceptance criteria. However, not every returned core will qualify, and not every accepted assembly will have every internal piece reused.
Core acceptance and detailed remanufacturing inspection are different stages. An initial evaluation can establish eligibility for credit, while later disassembly reveals which individual pieces are suitable for recovery.
Step 3: The Remanufacturing Process Begins
For suitable cores selected for remanufacturing, the work goes beyond cleaning the outside and putting the part in a new box. The exact process depends on the component and the remanufacturer, but it can include these steps:
- Disassembly: The assembly is taken apart so its individual components can be evaluated.
- Cleaning: Oil residue, carbon, dirt, and other contaminants are removed using methods appropriate for the components.
- Detailed inspection and measurement: Reusable pieces are checked for wear, damage, and dimensions that affect fit or function.
- Reconditioning and replacement: Eligible pieces are restored where appropriate. Components that do not meet the program’s requirements are replaced or excluded from reuse.
- Reassembly: Approved recovered components and replacement parts are assembled into the finished unit.
A core can therefore contribute reusable material without every original piece staying in the finished part. The remanufacturer’s requirements determine what can remain and what needs to be replaced.
Remanufactured Doesn’t Just Mean Used
When comparing replacement parts, it helps to understand what the seller means by used, rebuilt, and remanufactured.
Used parts have previously operated in another application and are sold for reuse. The term alone does not tell you how extensively they have been inspected or tested.
Rebuilt parts have been repaired or reconditioned. The work performed can vary by supplier, so ask what was inspected, replaced, and tested.
Remanufactured parts go through an established process that includes inspection, reconditioning or replacement as required, reassembly, and testing against the remanufacturer’s requirements.
The product’s documented process matters more than a label alone. HHP offers products from multiple manufacturers, and the standards, replacement practices, testing, and warranty coverage should be checked for the specific part you are considering.
Step 4: The Remanufactured Component Is Tested
After reassembly, testing and quality checks help determine whether the finished component meets the remanufacturer’s requirements. Those checks depend on what the part does.
- Fuel injectors: Checks may evaluate fuel delivery and calibration using a test stand.
- Turbochargers: The process may include balancing rotating assemblies, calibration, and checks of operation.
- Cylinder heads: Checks may include pressure testing for leaks and evaluation of valve sealing.
These are examples of procedures used in manufacturer programs, rather than a single test sequence followed by every supplier. The relevant product documentation explains which checks apply to a particular remanufactured part.
Step 5: Back to Work
Once it completes the applicable process and passes the required checks, the remanufactured component can become a replacement for another diesel application. Your returned core has helped support the supply of parts that keeps that cycle moving.
The replacement you receive is not necessarily your own old component remanufactured and sent back to you. In an exchange program, your returned core supports future remanufacturing after you have received your replacement.
Returned. Inspected. Remanufactured. Tested. Back to work.
[Insert core journey infographic here.]
Why Core Condition Matters
A diesel core return can become an issue when the wrong component is sent back, required pieces are missing, severe damage exceeds the program’s criteria, or the return instructions are not followed. These issues can affect whether you receive credit and how much credit is available.
After installing your replacement, use this checklist to prepare your old component:
- Confirm the core matches the purchased part and review the applicable acceptance criteria.
- Keep required components together. Ask HHP about any missing pieces or damage before shipping.
- Follow the supplied instructions for draining fluids and preparing the component.
- Package it securely and include the required return paperwork.
- Use the specified shipping documents and carrier, follow the return deadline, and keep tracking information.
For packaging and shipping details, see HHP’s guide, How Do I Return My Cores? Your order’s return instructions should guide your shipment.
Have a Core to Return? HHP Can Help
Have questions about a core charge or returning your old diesel component? HHP can help you understand the return requirements for your part before you ship it.
Questions about your diesel core return? Call HHP: 844-304-7688.
Shopping for a replacement? Contact HHP for help finding remanufactured diesel parts for your application.
From Diagnosis to Delivery, we are Highway & Heavy Parts.
