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Common Part Descriptions and What They Mean to You

Common Part Descriptions

The world of agricultural, industrial, automotive and heavy duty parts is filled with an array of options. Part designations are thrown around left and right. Have you ever wondered what they all mean?What is the difference between a remanufactured engine and a rebuilt engine? New vs aftermarket? Why does the dealership want a core back? Let us look in-depth as to what they all mean how they can help you make an educated decision when buying your next part.


A core component is a non-working part that has all the physical components of the original part intact. Core parts and engines are primarily used for rebuilds or remanufacture. In order for a part to be rebuilt or remanufactured it must meet certain criteria. Generally for core engines this means no holes in the block, the engines crankshaft rotates 360° and it has no signs of harsh fire damage. You can check out GRC’s full list of core criteria in the following link for engines, fuel pumps, fuel injectors, turbos, ECMs and EGR coolers.

Core Criteria


A used part is a component that has been taken out of running machine for resale. Many people consider used parts as the best value when a unit fails. The value of a used part is hampered by its uncertain reliability. With used parts, there is no way of knowing how the previous vehicle was driven, maintained or how long the part will last. Used parts are not tested to ensure OEM specs and they do not come with a warranty. There is a bit of luck when deciding on a used part as buying used is the least costly option up front but there is a real possibility of spending more in the long run.


A rebuilt part is one that has had its faulty components replaced before reassembly for sale. Doing this gets the part up and running again but does nothing to address any issues that may have caused the part to fail prematurely in the first place; leaving you with a unit that is likely to fail again. Some rebuilt parts come with a warranty but many do not. Rebuilt parts are generally tested to ensure that the part is working correctly but they are not tested to ensure OEM standards.


Remanufactured parts go through a process to bring the part back to new or better condition. Reman parts are completely disassembled, cleaned, examined and brought back to 100% OEM specs. Product engineers identify any patterns of failure that cause units to wear prematurely. If a problem is identified, the parts are reengineered to correct those flaws resulting in parts that are better than new. This feature of remanufactured parts along with the cost savings when compared to new parts is what makes reman parts a better choice than new or aftermarket. All remanufactured parts come with a warranty from the OEM or remanufacture.


New parts are designed and manufactured to meet or exceed the original equipment part installed by the vehicle manufacture. Brand new components are used during manufacture and all new parts from the OEM come with a warranty. The biggest downside to new parts is the cost as buying new is the most expensive option.


Aftermarket parts are parts designed and manufactured by companies with little to no association with the original equipment manufacturer. All new components are used during an aftermarket parts manufacture but generally all aftermarket parts use cheaper materials and components to keep costs down. These cheaper materials can cause premature part failure. New aftermarket parts come with a warranty from the aftermarket part supplier. Aftermarket parts are generally less expensive than new parts.

Coke or Pepsi, Chevy or Ford, John Deere or Case IH; there is no one choice that is going to be correct 100% of the time. GRC offers all types of parts ranging from core to new. Whatever your choice of part, have confidence knowing that what we offer is going to fit your year, make and model of machinery.

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