12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHMy '99 has a single row bearing...
Leading reported evidence
Replace by a ln authorized installer
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Read evidence and context
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1
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Performed · outcome unconfirmed
I had it preemptively replaced by a LN authorized installer.
Leading evidence: 'Replace by a ln authorized installer' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'later in my case' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace by a ln authorized installer' (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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Performed · outcome unconfirmed
My MY99 has a single row, I also just found out when I had the imsb/clutch replaced a couple of weeks ago.
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
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Performed · outcome unconfirmed
Last week we had a 97 Boxster that had a single row IMSB, the engine was replaced in 2003, hence the single row bearing.
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 suspect a cause
1
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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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T064914Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I just thought I would share this out to the community. I recently had my clutch replaced, and decided to do the IMSB as well. I was surprised to find out it was a single row bearing, as the general thought is that MY99's and some MY00's have a "better" dual row IMSB. I figure that there are a couple of possibilities..
1) Some 99's did have single rows.
2) My '99 has a replacement engine, and was inadvertently downgraded to a single row in the process.
I suspect the later in my case. So just putting the word out.. if you have a '99 and you don't have the complete service history, it is possible that you don't have a '99 engine and dual row. Or...not all 99s are dual row.
I wish there was some way to tie an engine serial to a date of install..
...and my '01 has a dual row. I had it preemptively replaced by a LN authorized installer.
So...maybe my engine was swapped. ( no records reflecting this). Dunno
Thanks Frank, M96/01AT66X65297 which would indicate a reman '99 engine (66x). I had seen that thread a along time ago and forgot about it, I guess I can assume it was likely replaced after 2000 and they put a single row bearing in at that time. You would think the serial would be eligible for the class action.
Your 99 with a single row IMSB has seen an engine replacement by Porsche post 2000. When the factory makes a change, they make it retrospective and don't keep the prior technology for remanufacturing.
Last week we had a 97 Boxster that had a single row IMSB, the engine was replaced in 2003, hence the single row bearing. This happens all the time.
"AT" and/ or "X" in the engine serial # indicate a reman. A "Y" in the serial indicates a new engine, which you could have as well.
Wait, a Y means new engine and not original? I have a 2000 and I thought the Y was for year 2000?
Here is mine and how I thought I deciphered it.
Engine m96/0466Y07207, 04=c4, 66Y=6 cylinder 2000 build, 07207=serial
I just did the Ln Imsb swap and it was dual row.
