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Rebuilt or Remanufactured of motors


The term "rebuilt engine" refers to any engine that is removed from the original vehicle, repaired, and replaced in that vehicle or any other vehicle. Unfortunately for the consumer, there are no specific standards for what type of repairs are done to a re-built engine. Some companies may only do necessary repairs, such as replacing damaged pistons or valves; others may make more through changes, such as replacing all pistons and valves.
The term "remanufactured engine" refers to a used engine, or "core," which has been completely overhauled to "like-new" condition, including the replacement of all parts such as valves and pistons, and the removal and reconditioning of all parts. In terms of function, it is the equivalent of a new engine.
"With a remanufactured product, you have the benefit of hindsight," said Mike Pfau of Jasper Engines. "When these original engines were designed and built, they were designed and built in a certain manner. When they get into service, there may be things that have failed, which did not hold up as well, that experience and history can teach us. So we as manufacturers will look at those areas, and we'll make modifications that will improve the overall performance and durability of the engine."
Typical modifications include replacing the intake valves with sodium-filled valves; replacing exhaust valves with stellite exhaust valves; putting in a hardened crankshaft; installing hyper-eutectic pistons; installing chrome-molly piston rings; adding a Teflon rear seal; installing chrome-plated valve stems; and installing graphite-coated pistons. The addition of high-performance parts, which are more resistant to heat and friction, increases engine performance and durability. Though these types of remanufactured engines are somewhat more expensive, they offer cost savings in maintenance and vehicle downtime in the long term.
When searching for replacement engines, fleets have to consider engine quality and durability, and the type of warranty provided, as well as how long the company has been in business. What do its other customers say about the product? What parts does it automatically replace, and are there parts that it will not, and why? Do they test them? Those are all criteria that fleet managers need to look for in order to shop for the best value.
 The other method is planned replacement at a specific mileage, regardless of whether the engine has experienced a failure or major breakdown. The proactive method offers other savings in engine-related maintenance costs, since the related parts receive less ancillary wear.
"We found that if you are proactive in replacing engines, you won't spend more in the long run, although your initial expense may be more," said Bob Haddox, director of transportation for Tulsa Public Schools, which routinely replaces engines to extend vehicle service life in its fleet of 600 trucks, buses, cars, and maintenance vehicles.

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