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I think he is asking because he got involved in another IMS thread and he said he had his replaced when he did the clutch and everyone said it is not possible to replace a 2006 IMS bearing so he started this thread to find out if it was possible.
Exactly. Plus I've had a couple of people ask me about this because it is a unique situation, wanted to help out the group if possible.
Typing this on my phone at the moment, will answer other questions later.
I am also very curious on what Jake will say on this.
The LNEngineering invoice clearly showed the item number 106-80.2 which is not a ball bearing part, it’s a sleeve bearing, similar to the one used on 996 turbo model. The description on the invoice said it’s a ball bearing.
Technically, some people do replace a large bearing by breaking the bearing apart inside the engine case and take it out piece by piece (similar wisdom teeth extraction). That’s a very risky procedure because it can leave metal parts inside the engine.
If the mechanic did that then install the sleeve bearing LNE part number 106-80.2 then the IMS bearing is the same as the turbo model and will not fail. This actually is a much better design than the ceramic bearing.
A while back here was some guy who posted that he had a method which involved milling down the engine block to allow removal of the bearing in a later 997. Seemed questionable at the time but who knows?
Here's a thought: OP. Have your tech come on line and post what he did for our edification. It will be great publicity for him and if he has a way to do this others will beat a path to his door. I am serious here!
Something isn't adding up here. I tend to think you got screwed. Just because someone gave you his info as a reference does not guarantee that the guy is honest Abe
Offhand I'd say he is asking because deep in the pit of his stomach he is beginning to get that funny feeling....'oh oh, what happened here?'
Actually, no; I posted this thread because I've had a few people on the forum ask me about my IMS replacement in my '06 saying that's it's highly unusual. Just looking to help out the group because it seems this is all new information.
I trust the tech that did the work without a doubt. I'll ask him to chime in here.
My guess is that one of two things is going on here:
1) Porsche used 05 parts in an 06.
2) My 06 engine blew at some point and they put in an 05. However this seems doubtful now based on comments in this thread about the photos I posted.
So if anyone has knowledge and can help confirm #1, that would be excellent.
I have been around enough to know Porsche does some strange things and mixes model years and production number all the time. I have also seen some less than trust worthy mechanics.
I would venture to the 996 forum, post this, and see if Jake or Martin or someone who has done a large number of rebuilds has seen an 06 with a 22mm nut and a replaceable bearing.
I'll do just that, thanks for the advice. Will report back here if I find out any new info.
If you are going to venture into 996 land be ready for it to go off topic, see some pictures of *****, and get an answer. That is generally how most of the threads there go
If you are going to venture into 996 land be ready for it to go off topic, see some pictures of *****, and get an answer. That is generally how most of the threads there go
I would have gone there much sooner had I known that.
If you are going to venture into 996 land be ready for it to go off topic, see some pictures of *****, and get an answer. That is generally how most of the threads there go
997.1's have an IMS and an IMS bearing. 997.2's do not. The 997.1 series is from 2005-2008. Early 2005's had the replaceable small single row IMS bearing. Late 2005's through 2008 have the non-replaceable larger single row IMS bearing. This means some 2005's are failure prone and fortunately are also replaceable. The remaining 2005's through 2008 are not replaceable (at least not without engine tear down). Not a big deal though because late 2005 through 2008 have the non-replaceable but much more reliable bearing.
Engine serial numbers can be used to determine the switch over. Serial numbers have the format below.
M97/01685XXXXX = M97 for MY05
M97/01686XXXXX = M97 for MY06
M97/01687XXXXX = M97 for MY07
Replacement engines have the format M97/01AT68?XXXXX where the "AT" is abbreviation for Austauch which means "exchange".
According to Porsche engines with serial number 68509790 and below have the smaller problem bearing, which is replaceable. Engines 68509791 and above have the larger non-replaceable but more reliable single row bearing. Since the cutoff is M97/01685XXXXX format, this matches all documentation that only MY2005 is affected.
Now, the OP has a 2006 C4S with engine serial number M97/0168608545. It's a 2006 so all documents say it's the larger bearing. The serial format matches Porsche's documents 686XXXXX saying it's a MY2006 original engine. There is no "AT" in the serial number so it's the original engine to the car. The serial number is above the cutoff of 68509790 so it's the larger single row bearing. The picture the OP posted in at the top shows the larger nut so it's a larger row bearing. Everything here points to the OP's engine having the larger more reliable non-replaceable bearing. The only way this bearing was replaced was to remove the engine and tear down the engine.
So why does the OP believe he has a smaller bearing that was replaced by his mechanic without an engine tear down? What am I missing?
03-19-2016, 06:49 PM
