engine specs MY99 carrera

[dylanjl]

Hey guys

I have had my 99 Carrera for a couple of years now..I have always wondered about the engine specs.

I know the MY99 is a 3.4l engine...but on my car, the plate inside the engine bay cover states displacement: 3596cc....which is 3.6l...is this correct or do I not have the original engine that the car came with? I need to order some parts now so need to make sure I order the right stuff.

Your input will be greatly appreciated.

Regards

Dylan

PS

If it helps I can attach a photo of the specs inside the engine bay..

[Loren]

Only way to make a best guess is from the engine serial number (and assuming no one has made internal changes/mods to the engine).

Sometimes folks add the nicer air cleaner cover from the late 996 and 997 series - but that does not change the engine.

[dylanjl]

thanks I will check the engine serial number..where is the easiest place to find it?

[Loren]

Search is your friend...

http://www.renntech.org/forums/topic/16437-anyone-know-where-the-vin-is-on-the-996-engines/#entry82150

[dylanjl]

My engine serial number indicates MY98..is this normal on a MY99 Carrera?

Also, there is "AI" after the number "551" right at the end of the serial number..any idea what "AI" indicates?

Thanks

[Loren]

My engine serial number indicates MY98..is this normal on a MY99 Carrera?

Also, there is "AI" after the number "551" right at the end of the serial number..any idea what "AI" indicates?

Thanks

It certainly can be. Production for MY1999 began in July 1998 so it is definitely possible to have parts (including engines and transmissions) built in 1998 but used in MY1999.

BTW... pretty much all car makers do this.

[Richard Hamilton]

Could that be AT, rather than AI? AT is short for Austausch, German for Exchange.

[logray]

Likely the case was reworked. Also check for blue paint on the case, it means the same thing.

[dylanjl]

Ok

Is that a good thing.. Like maybe engine will be more reliable? Any known issues corrected at time of replacement I hope..

[logray]

Reworked engines just mean they "went back to machine shop" to be made within spec, and were found to be in spec once work was complete.

Sometimes it can mean a factory "rebuilt" engine as well, depending on the year (example many M96-01 engines were remanu'ed in 05). In those cases yes it can actually be more reliable, for example if the original engine had a single row IMS bearing and then was upgraded to the larger non serviceable IMS bearing with load rating similar to the original dual row.

If you post your full serial we can help decode it.

Edited June 3, 2013 by logray

[dylanjl]

Thanks !

M96/0166WO/551AT

[boxster-s-dk]

That is a rebuild from Porsche...like mine;-))

[dylanjl]

Thanks for all the help guys!

I was looking at doing An IMS update as a preventative measure but wanted to make sure my engine didn't already have a similar update..

[logray]

Are you sure this is the complete sn? Having hard time decoding it. Maybe take wire brush to the sn plate, cleqn it, and take a pic.

Want to make sure if you have the larger stronger unserviceable ims bearing before you tear into it.

Pm me if someone or I do not respond right away.

[dylanjl]

https://www.facebook.com/photo.php?fbid=10151646577716211&set=a.10151308513171211.507949.602511210&type=1&theater

sorry cannot figure out the correct way to upload a photo..

[Loren]

https://www.facebook.com/photo.php?fbid=10151646577716211&set=a.10151308513171211.507949.602511210&type=1&theater

sorry cannot figure out the correct way to upload a photo..

Site Help - under Posting

[dylanjl]

[dylanjl]

[logray]

This is what I'm seeing, can you confirm?

M96/01 66W 07551 AT

[dylanjl]

Yes logray

Although I thought the " 7" could possibly be a "/ " as well ??

I also see M96/01 66W 07551 AT

Thanks for your help!

[Hilux2400]

dylanjl, I don't know if you have seen another thread that I started recently where engine numbers featured, but I also have AT in my group which reads:

M96/03AT 665 66***

Here you will see in my group that the AT is in a different location.

I am pleased that you started your thread as it was the source of my finding out what the AT stands for (Exchange). From excellent sources on this board I was told that for the the group 665 the last digit "5" gives the year of manufacture. In your case the "W" will do that, which is for 1998 I think. In my car the original engine had the group 663 indicating a 2003 engine consistent with the car's year of manufacture.

As for the "AT" Porsche UK could not tell me what the letters stand for. However, the technicians in my nearest Porsche dealership in the UK think that it could mean that the engine has been replaced at some time. The parts catalogue does not recognise the number when the letters AT are included.

It would be an interesting thread to find out how many 996 Porsche vehicles have exchange engines with the stamp "AT"

Best of luck with your quest.

Edited June 15, 2013 by Hilux2400

[logray]

Good engine serial number threads:

http://www.renntech.org/forums/topic/39095-mismatch-engine-numbers/

http://www.renntech.org/forums/index.php/topic/5353-m960-engine-sn-decoding

http://www.renntech.org/forums/topic/5353-m960-engine-sn-decoding/

http://www.renntech.org/forums/topic/32795-engine-serial-%23s/

[logray]

For dylanjl...

M96/01 = 1st gen 996 3.4L water cooled

66W = 1998 911

07551 = production sequence (in the range 00501-60000)

AT = rebuilt/exchanged

Your S/N is in the original range, check for the presence of blue paint on the case.

Edited June 15, 2013 by logray

[Hilux2400]

Good engine serial number threads:

http://www.renntech.org/forums/topic/39095-mismatch-engine-numbers/

http://www.renntech.org/forums/index.php/topic/5353-m960-engine-sn-decoding

http://www.renntech.org/forums/topic/5353-m960-engine-sn-decoding/

http://www.renntech.org/forums/topic/32795-engine-serial-%23s/

Thank you. Those are really interesting threads. Particularly the posting that refers to the inclusion of the "X" for rebuilt with some parts and "AT" which is exchange.

What is the state of an exchange unit? Does it come ready assembled with all necessary parts such as alternator, air con, power steering, manifolds, and belt etc all set up, or is it just a bare block and heads?

What's the feeling on a poll to find out the extent of exchange engines currently in use, such as those bearing an "AT" stamp?

[dylanjl]

Logray you are awesome

Thanks!

Would you say I could go ahead with an IMS upgrade then? Cheers!