Factory replacement engine

I own a 2002 911 Carrera Cab and discovered after purchase that the engine had been replaced. I do t have any documentation on it and was hoping there is some way for me to find out more about the engine. I do have the serial number (M96/03AT66567290. I do know that it�s a 3.6 motor built in 2005 but I was hoping there is a way to find out more Any help is greatly appreciated!

Nothing more to know. its built exactly like every other 3.6l for a 996 mk2 motor. only unknown would be if u have the large unserviceable imsb. There r some serial number refferences for when they started using them but the only way to make sure is to pull the trans and loik at the flange

Same same, mine had the large single bearing. No paperwork/documentation came with the car(Porsche dealer), but a very well detailed Carfax. However no mention of the reman installation.

Are you wondering why a new engine was put in your car or just looking for engine info?

Quotes source post: 17743251

I want to find out about the engine. When I bought the car it was never disclosed to me and I don�t know how many miles are on it. thanks!

Makes sense. You may or may not be familiar with the 996 RMS/Go-No-Go era as well as the 996 Engine Replacement program era. Between 2003-2006 give or take a few months, the 996 had a problem with the Rear Main Seal which was leaking. This was way before the IMSB issue became mainstream. At that time, a large number of RMS were leaking. So under a warranty, Porsche would replace the RMS and with it the Intermediate Shaft Seal just as a precaution. Today, most don't even talk about the RMS because Porsche found a more durable seal. But as they were replacing the seals and on their way to a more durable RMS, Porsche was trying to figure out why they were leaking. What they found was that some of the cars did not have perfect alignment between the engine and the crank. They were using different metals and they were expanding and contracting at different rates throwing off alignments so they developed a Go-No-Go tool that would measure the alignment. If the alignment was off (No-Go) they would replace the engine under warranty. It was a good deal. The owner got a new engine, and there are no issues today. As mentioned earlier, at that time, IMSB failure was minimal, and no one ever heard of bore scoring. Don't know how many engines were replaced around that time period, but Porsche found a more durable RMS, and the replacement program with the Go-No-Go tools ended. So if you had to guess how old your engine is, there is a pretty good chance if it was replaced due to the Go-No-Go tool, it most likely happened before 2006. In addition, at that time, Porsche also had a he'll of good engine replacement program, that you could trade your engine in and replace it with another for a much cheaper price than rebuilding. Forget the cost, but I think it was about 7k. That program stayed in place for years, but the cost did go up. I understand that there are a few engines left but it may be a 15k+ program to get a stock engine. Because of this program, the term "Throw-Away-Engine" became the street name for this program. It was pretty popular as you could imagine from a cost standpoint. My understanding from a high end Indy shop is that Porsche still has that program in place today for the 996 but there arent many engines left. Interestingly, that program is actively used today for the 991 and 992. In fact, the shop mentioned that if a GT3 or GT3 RS engine would blow, of which they do, they will use the program instead of rebuilding. The reason is that it's cheaper to replace than rebuild at this point in time. So, if your engine had an IMSB failure and it was out of warranty, there is a chance that your engine was a replacement under the program. Obviously today, we have plenty of preventative solutions for the IMSB as well as the RMS really isn't an issue. But I figured you would appreciate the history. There are plenty of guys on this thread that worked for Porsche at that time who may be able to provide more details as to how you can get more info on your engine. ​​​

As a side note, we were all trying to get a replacement engine at that time. Who wouldn't want a new engine under warranty...

I have the same story, 2002 targa with a replacement engine Engine number m96/03 AT665 65131. My engine has the larger un-serviceable bearing. I was not given any information from Porsche NA about the details, they cite privacy reasons. However, clues on the car fax history for an extended period in 2006/7 when it was not insured, lead me to believe that was when a warrantee replacement happened. That lined up with 16,000 km and I now have 75,000 km, so I service it like a 60,000 km motor. hope that helps