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YOUR RESEARCHSurprise when I pulled the old IMSB out...
Leading reported evidence
Replace also
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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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Also, it appeared to have been replaced previously (according to my mechanic, a former 996 owner and he has done several IMS jobs).
Leading evidence: 'Replace also' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace also' (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
Not all engines were replaced because of a failed IMS 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.
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Performed · outcome unconfirmed · Original poster
I quickly called ln engineering to verify I have the correct bearing and they told me that my car most likely came from the factory with a dual row and it may have had a IMS failure and was replaced by Porsche with a 3.4l with a single row IMSB.
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.
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Performed · outcome unconfirmed · Original poster
I quickly called ln engineering to verify I have the correct bearing and they told me that my car most likely came from the factory with a dual row and it may have had a IMS failure and was replaced by Porsche with a 3.4l with a single row 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.
9 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Recently purchased a MY99 C2 996, first Porsche. I have read through A good deal about the 996's prior (and after) purchase and put my car into the shop for a heavy bit of preventative maintenance. All fluids flushed and replaced, aos, thermostat, water pump, brakes, bushings, drop links, tires, rms, spark plugs, clutch (sacks preformance), flywheel, plus a few upgrades: ipd, b&m ssk, 200 cell cats, and the IMSB.
I ordered the LN dual row IMSB and thought I would be good to go, but when I pulled the old IMSB out it was a single row... Also, it appeared to have been replaced previously (according to my mechanic, a former 996 owner and he has done several IMS jobs).
I quickly called ln engineering to verify I have the correct bearing and they told me that my car most likely came from the factory with a dual row and it may have had a IMS failure and was replaced by Porsche with a 3.4l with a single row IMSB.
Does this sound right to you? Either way, I love the car and overnighted a single row IMSB to put in the car tomorrow.
The only other question is how do I know if my engine is a 3.4 or 3.6? I know it's unlikely, but curious to know how to determine a 3.4 vs 3.6.
Thanks
If it's got a single-row bearing, the theory that it's got a replacement motor seems sound.
Get the engine number (it's on the edge of the sump plate) - you can use it to determine if the engine is a replacement.
I had a similar surprise, and my engine number confirmed that it was a replacement engine.
It is unlikely to be a 3.6 because of the many differences in the DME and sensors.
Confirmed its a 3.4 (says F1 on the side of the engine); I still need to verify (AT) for factory remanufactured. The car is back on the road today, drives well and now I'm sleeping better with the imsb replaced...
Thanks to all for your input.
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