22 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIMSB question and pictures
Leading reported evidence
Replace seal
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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1
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Performed · outcome unconfirmed
My seal was replaced by a dealer under the previous owner and I have that part number, but no idea what bearing is in there.
Leading evidence: 'Replace seal' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean & rebuild' (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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Suggestion
everyone here says once metal is found in the filter, nothing can fix it other than a full tear down, cleaning & rebuild.
Clean of all associated parts, replacement of wear items
Suggestion or failed attempt
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Unsuccessful attempts
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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.
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Suggestion
A complete engine tear down and inspection, a thorough cleaning of all associated parts, replacement of wear items and then re-assembled.
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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Suggestion
I think you need to be careful how you use the word "solution" as it pertains to the IMSB.
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: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Reaching out the the 996 forum brain trust to identify this bearing that was pulled from my car. Is this the OEM dual row or an aftermarket solution?
The bearing appears to be in exceptional condition... seals are in good shape as well.
Here is the bearing as compared to the LN solution.
Interesting that the LN part is not as deep.
Thanks Stan... I think that's pretty solid evidence that it's the OEM bearing.
Interesting (and surprising to me) that my 2001 had a dual row. Either way, the LN is going in as a replacement since it's all apart right now.
My momma always said, "Life was like a box of Chocolates.....oops correction...
My Porsche Indy always said, "Life was like an IMSB. You never know what you're gonna get."
Definitely an original dual row. Your story is exactly like mine. Went in expecting a single (and planned to do the Solution) and found a dual in our 01.
Had I known I would have left that sleeping dog alone.
I think you need to be careful how you use the word "solution" as it pertains to the IMSB. That LN retrofit bearing is NOT "the solution" (which is a plain bearing)... I think you probably already realize this, but maybe chose the words accidently. Unfortunately, this just adds to the confusion amongst the many IMSB products that are now on the market. Ok, I'll hop off my soapbox now...
Not to hijack the thread, but is it possible to determine dual-row vs. single-row based on the part number of the IMS seal and cover? Not the bearing itself, just the seal and cover parts. My seal was replaced by a dealer under the previous owner and I have that part number, but no idea what bearing is in there.
If it is factory parts, yes. Don't know about the after market options.
You can tell the captured bearing by the size of the nut. It is considerably larger than on the older replaceable bearings. This shouldn't be found on a 996 unless it got a factory replacement engine after that bearing became available.
The dual and smaller single row can be differentiated by the depth of the bowl on the flange. Shown here from Pelican the left is the single row and the right is a dual row:
Agreed,it is interesting & they are smart so there mus be a good reason..Speculating :
One reason might have been the additional expense of having that annular groove machined for the circlip - see photo NSK bearing above.
LN had achieved much additional load capacity anyway and did not need the extra few mm ?
That NSK 6204DUA17 is the original I had the same dual row in my 2000 Tip I removed mine due to lots wobble and metal shavings inside of seal section of IMSB shaft after 100K miles & 16 years later. The build date of my 996 was (9/99).
I got the EPS Roller bearing with the oil feed as the replacement and barely 1,200 Miles on it. Not much as far as trend analyst data, just enjoying the ride as I keep watching the miles rack up on the odometer.
To answer dKraige's original question I think gnat did it with his post and the picture. If you look at the picture he posted you will notice a difference in the part numbers pertaining to the depth of the bowl. If you look at the Porsche PET also you will see the different part numbers listed
99610502401 and 99610501702.
Unfortunately mine was similar to MiataR's IMSB cover as the original one did not have any recognizable part number markings what so ever.
would be nice to hear from you long term. everyone here says once metal is found in the filter, nothing can fix it other than a full tear down, cleaning & rebuild.
That is in effect what I actually did. A complete engine tear down and inspection, a thorough cleaning of all associated parts, replacement of wear items and then re-assembled. It took 6 months but glad I did it.
This is a source reference. Confirm exact model applicability in the original material.
