What Is a Core Charge for Rebuilt Connecting Rods?
A core chargeis a fully refundable deposit collected when you purchase a rebuilt component—such as a rebuilt connecting rod for a Detroit Diesel engine. In the world of heavy-duty diesel engines, many components are designed to be remanufacturedrather than discarded. This process keeps genuine OEM-grade parts in circulation, lowers long-term operating costs, and reduces waste.
When you buy a rebuilt connecting rod, Diesel Pro Power sends you a professionally remanufactured rod that has already been inspected, machined, aligned, resized, and returned to OEM specification. In order to continue offering rebuilt components at competitive pricing, we need the old connecting rod back. Your refundable core charge is simply an incentive to return that used part—known as the core—after you install the replacement.
Once your core is received and inspected, the charge is refunded.
Why Diesel Pro Power Charges a Core for Detroit Diesel Connecting Rods
1. Rebuilt Connecting Rods Depend on Recoverable Cores
Detroit Diesel connecting rods are extremely durable, and most used rods can be remanufactured to like-new condition. The rebuild process requires an original OEM core, meaning your old connecting rod becomes the raw material for the next remanufactured unit. Without the return of viable cores, the supply chain for rebuilt rods would collapse, driving prices higher and reducing availability.
2. Ensuring OEM Quality and Long-Term Reliability
Rebuilding a connecting rod involves precise measurements, reconditioning of the parting surfaces, bushing machining, alignment checking, and verification against factory tolerances. Diesel Pro Power’s ability to offer this level of quality depends on access to original Detroit Diesel steel forgings—not aftermarket reproductions. Returned cores allow the next customer to receive the same heavy-duty OEM forging instead of a lower-grade alternative.
3. Stabilizing Inventory for Hard-to-Find Detroit Diesel Parts
Many Detroit Diesel engine families—Series 71, Series 92, Series 50, Series 60, 149 series, and others—are aging platforms with limited production of new OEM rods. Rebuilt rods help support owners, operators, and rebuild shops who rely on these engines. Core returns ensure rebuilt inventory stays consistent, so customers can get the correct rod style when they need it.
4. Making Pricing More Affordable
The core charge keeps upfront costs lower. If Diesel Pro Power had to source OEM rods independently for every rebuild (rather than recycling cores that customers return), the price of each rebuilt rod would be significantly higher. By returning your old rod, you help preserve a circular supply chain that keeps rebuilt Detroit Diesel parts both accessible and cost-effective.
5. Encouraging Proper Recycling and Environmental Responsibility
Returning your used connecting rod prevents perfectly usable OEM steel from being scrapped. Instead, it is reconditioned to continue serving for thousands of hours in marine, industrial, trucking, or power-generation applications. The core system keeps valuable materials in circulation and reduces waste associated with casting and manufacturing new components.
How the Core Charge Works
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You purchase a rebuilt connecting rod
The core charge is added to your order as a temporary deposit. -
You return your old Detroit Diesel connecting rod
Most customers simply send back the rod that was removed during the overhaul or repair. Diesel Pro Power requires an RGA (Return Of Goods Authorization Form) to be filled out and sent with the core so we can identify it and contact you with further information. -
We inspect the core
The returned rod must be rebuildable—cracked, broken, or severely damaged rods may not qualify. -
Your core deposit is refunded
Once approved, the full core amount is credited back to you.
