22 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLN IMS update on 04 C4S
Leading reported evidence
Inspect the stock ims had lived a happy 88,000 miles
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
With the previous owners penchant for frequent oil changes, and having nothing visible when the filter was inspected, the stock IMS had lived a happy 88,000 miles.
Leading evidence: 'Inspect the stock ims had lived a happy 88,000 miles' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'dual' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check receipt' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
Just for comparison.......I had the replacement IMS bearing (got it from Jake) installed by a Porsche dealer.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Performed · outcome unconfirmed
I also had the LN IMS installed last week in my 2003 C4S.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Inspect the stock ims had lived a happy 88,000 miles
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
With the previous owners penchant for frequent oil changes, and having nothing visible when the filter was inspected, the stock IMS had lived a happy 88,000 miles.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
22 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
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Generation: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Seeing as how the IMS is such a hot topic these days I thought I would add some info from my recent swap to an LN IMS. By the way... at 88,000 miles the stock bearing was still good...
I had recently purchased a well documented and maintained 2004 C4S that had all of the known issues addressed except the IMS. With the previous owners penchant for frequent oil changes, and having nothing visible when the filter was inspected, the stock IMS had lived a happy 88,000 miles.
Since I plan to drive the car hard and start doing DE track days, it was just a little piece of mind to go ahead and swap the bearing.
I contacted Berk at DBC Tuning in San Antonio, as they had looked after this car with the previous owner, and they are the only authorized LN Engineering specialists for South Texas.
If anyone is looking for an Indy shop that knows Porsche's, I highly recommend DBC.
Anyway, here are some pics.
Thks for the input--nice bearing--nice car !
Bob
01 C4
31 Ford cp chp & ch, 302/350
40 ******, 302/350, IFS
38 Ford cp, 327/350, IFS
57 Belair
62 356B --long ago
Nice acquisition. Good decision to swap out the IMSB at this point in the car's life. I did the bearing in my '04 Boxster S at 63,000 miles. Original bearing looked perfect.
One question. Your mechanic has the old flywheel bolts in the end of the crank, as if he's waiting to use them again when the time comes to bolt up the flywheel. Those bolts should only be torqued to spec one time. Any time they are removed they should be replaced. Especially if the car will see track action. You might check your receipt to see if he used new bolts. They should be on your invoice. Hopefully all's well.
Enjoy your new ride.
I also had the LN IMS installed last week in my 2003 C4S. At 26k miles, the original bearing appeared to be in excellent shape. While the car was apart, I also had the clutch and RMS replaced. Total cost was around $3200.
What's up with all these new 1 post count newbs chiming in on anything IMS related? I mean they come and go and contribute absolutely nothing other than IMS stuff.
I know. Maybe we should have a subforum for IMS for M96/M97 engines so ppl can vent/discuss/curse, whatever to keep the negative energy there and leave room for people who are sharing their joy and pride of 996 ownership in the main forum.
I think the sticky "IMS discussion" thread was meant for that but so far it has only 24 replies despite the never ending debate of IMS!!
Too be honest, I hesitated posting another IMS thread. My intention was to show that at 88,000 miles the bearing was still good.....
But.... I know that there is an issue, so I took care of it.
Mod's.. If you want to move this to the IMS thread, please do.
Canuck, my comment was not directed to you but rather just saying I agree with Alpine. I think Alpine was referring to the single post user and not you.
I see no problems with your thread at all.
Surprisingly good. No noticeable rough spots etc. We did not bother to disect the bearing on this car as it was smooth to the touch and never showed any signs of degradation when oil filters were cut apart and inspected.
If anyone is interested or close enough to San Antonio Texas and wants this done, I recommend DBCTuning. Several people have asked me what the cost was, and I wanted to leave that in Berk's hands, but he said I can share that info, and will honor that price for anyone on this forum.
They charged me $1500.00 for the LN install. This is for man trans, you will need to call him if you have a tiptronic.
Actually those are the flywheel bolts and yes they should be replaced. I typed "case bolts" because its a good time to replace the old style "defective" case bolts with the new recommended ones. I dont want to alarm or cunfuse you, I was just asking about the case bolts because they are very easy to get to during an IMSB job. Very nice car BTW!
Just for comparison.......I had the replacement IMS bearing (got it from Jake) installed by a Porsche dealer. While at it i had them install a new rear main seal, new clutch assy, new air/oil separator.......I think that's it.
All that with the oil change of course was just about $3k dead.
As I say, just for reference.......and this was about 18 months ago.
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