Why a Reman Engine?

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Dr Motorworx is
 Hampton Roads leading remanufactured engine installation center. 

Visit our convenient
 location at
2600 Build America Dr
in Hampton, VA ... or

(757) 838-8723

What is the difference between a Rebuilt Engine and a Remanufactured Engine?
Throughout this website you may have noticed the statement that Dr Motorworx uses only quality remanufactured engines to extend the life of your vehicle. We use engines from sources with excellent reputations such as Jasper, GM Goodwrench, and ACDelco, to name just a few. When considering engine replacement, you may have noticed the terms "rebuilt" and "remanufactured" but thought the terms referred to the same process. 

There are major differences in engines that are rebuilt or remanufactured. Typically, a rebuilt engine will have a much shorter life than a remanufactured unit because the process is much less precise and therefore, less predictable.

Rebuilding is done in local shops and depends upon the judgment and skill of the individual mechanic. Parts believed to be serviceable are cleaned and reused; only worn or broken parts are actually replaced. If reused components subsequently fail or break, diagnosis and repair can be very costly.

Remanufacturing is a very exacting factory process where engine and component parts are completely disassembled, thoroughly cleaned, carefully inspected, and conditioned and machined to OEM tolerance specifications. The finished engine is tested using state-of-the-art computerized equipment. Remanufacturing is similar to building a new engine; simple replacement of parts, or rebuilding, will not result in the same high quality product that is produced by the remanufacturing process. 

How is it done? The remanufacturing process begins with a sound, undamaged engine "core" core that is dismantled to the smallest component and then carefully cleaned, conditioned, and machined to OEM tolerance specifications. Each reusable part is machined to original manufacturer tolerances. Throughout the process, the parts are continuously inspected for hidden damage and removed from the process if tolerances are not maintained. A core is shown to the right.

The cleaned and reconditioned or new parts are reassembled to what is known as the "long block" assembly. The long block assemblylong block is the heart of the engine and when installed, is connected to the other parts of the vehicle, such as the exhaust, fuel systems, and electrical systems. A long block assembly is shown to the left.

Among the new parts in a quality remanufactured engine are piston and pins, piston rings, connecting rod bearings, main and camshaft bearings, pushrods, the timing gear and chain (where applicable), valve lifters, gasket and seals, freeze plugs, and oil pumps. Valves, springs and guides, along with crankshaft and connecting rods are either remanufactured or replaced. Cylinder heads are cleaned and resurfaced, cylinders are bored and valve seats are resurfaced.  

Once assembled, a remanufactured engine must also meet factory specifications during oil pressure, compression, and vacuum testing. 

If your vehicle is in good shape but your engine isn't, replacing your engine with a remanufactured one is probably the only way you will have "new car" performance. We at Dr Motorworks recommend remanufactured engines because they insure greater customer satisfaction than rebuilding the old one. Not only is a quality remanufactured engine restored to original specifications, due to improvements added by the manufacturer the end product can be better than a new engine of the same type.  

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