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Frequently Asked Questions (FAQs)

Q. What is a remanufactured engine?

A. A remanufactured engine is exactly that – an engine which has been returned to the manufacturer’s specification to provide levels of performance, reliability and life similar to that of the original engine.

It is not a "replacement", "exchange" or "rebuilt" engine.

The British Standard Automobile Series Code of Practice BSI AU 257:2002 fully details how for spark and compression ignition (diesel) engines, components shall be inspected and checked against manufacturers tolerances. Key components including piston assemblies, big and small end bearings / bushes, gaskets, seals , timing chains and drive belts are renewed whilst items such as tensioners and dampers are checked and replaced where necessary.

Important additional operations such as crack testing machined components or deburring reworked oilways ensure original performance is achieved with reliability.

As well as having all key clearances, tolerances and end floats checked after assembly complete engines are also required to be checked for oil pressure and compression.

Finally, remanufactured engines offer the additional advantage of having their own unique serial number stated in the accompanying documentation which details renewed components, completion date, test records and relevant instructions.

Q. Is a remanufactured engine different from a rebuilt one?

A. Yes. A remanufactured engine has gone through a rigorous programme of cleaning checks etc. A rebuilt engine, although perhaps suitable for some applications, will not be to the same standard.

Q. Why is a remanufactured engine better?

A. Because it has been built to a much higher standard with new components and tolerances to the manufacturer’s specifications.

Q. Can all engines be remanufactured?

A. Generally yes, but it depends on the damage that may have been done to the engine. For example, if a conrod has gone through the side of the block than the block cannot be reused.

Q. How long does it take to remanufacture an engine?

A. This depends very much on the engine size and specification, but typically 3 to 5 days.

Q. When a engine is remanufactured, is it my own engine that I get back?

A. This depends on what you have agreed with the member. In most situations it will be your engine. The member, however, will consider the work that needs to be done and work out a cost for this. In some cases it may be a less expensive option to have an exchange engine. In this case you will not get your own engine back.

Q. What is an exchange engine?

A. An exchange engine is just that. Within the industry there are companies that remanufacture engines on a production line basis. This gives them economies of scale that allow them to market engines at prices lower than taking an engine and remanufacturing it from scratch. In this instance your engine is sent to them on an exchange basis for them to remanufacture.

Q. Is that a good thing?

A. A very good thing. Remanufacturing engines is a very ‘green’ thing to do. From the collecting of the raw materials, to making the steel, to making the engine itself, an enormous amount of energy goes into this process. It goes without saying , therefore, that a huge amount of energy is saved by remanufacturing. Good for the pocket and good for the planet.

Q. Is it only the engine that is remanufactured?

A. No. It is possible to remanufacture a cylinder head or a short engine. Both would be remanufactured to the same standard as a complete engine. Again, exchange units are available if that is better for the situation.

Q. What else should I consider when having my engine remanufactured?

A. You will need to consider that if, for example, your vehicle is eight years old, when you fit the remanufactured engine it will be as good as new and work as efficiently as new. Not so the other parts and ancillaries to the engine, which are still eight years old. The classic example is the water pump. When a remanufactured engine has been fitted and connected to the water pump it will probably be driving harder that when the engine was taken out. This could lead to failure and subsequent loss of coolant, which in turn could cause damage to your newly remanufactured engine. Make sure you speak to your supplier and ask his advice on what else should be done to ensure the best job. Remember, if you are paying to have the engine remanufactured it pays to be sure everything else will keep up with it.

Content copyright Federation of Engine Re-manufacturers all rights reserved June 2011
Federation of Engine Re-Manufacturers Ltd, Aftermarket House, 5 Marlin Office Village,
1250 Chester Road, Castle Bromwich, Birmingham, B35 7AZ
Tel: 0121 749 4767  |  Fax: 0121 730 2745  |  Email:

The site description is: Providing more influence, better information and stronger support to the Engine Re-Manufacturer and the keywords are: internal combustion engine, remanufactured engines, re-manufactured engines, reconditioned engines, re-condition engines, rebuild engines, re-build engines

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