12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHIdentify replacement engine... Serial Number
Leading reported evidence
Replace by porsche in 2009
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Yes 99 Cab, with engine replaced by Porsche in 2009.
Leading evidence: 'Replace by porsche in 2009' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'dual row imsb' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace by porsche in 2009' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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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Suspected cause
The original 99 engine was probably a dual row IMSB.
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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Suspected cause
The AT replacement engine is anybody's guess, but probably the large IMSB which requires the engine case to be split but also has the lowest failure rate of all.
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 contain suggestions
1
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Suggestion · Original poster
I was told this engine would have the "sealed IMS" used on engines afters 2005+, is that a correct statement?
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.
Suspected cause
The AT replacement engine is anybody's guess, but probably the large IMSB which requires the engine case to be split but also has the lowest failure rate of all.
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
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: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My 99 Cab has a replacement engine from Porsche with serial number:M96/04AT66Y6...
My understanding is that the Y after 66 should have an actual year... the engine was replaced by a Porsche dealer in 2009, am I missing something?
I was told this engine would have the "sealed IMS" used on engines afters 2005+, is that a correct statement?
Thanks in advance for your thoughts!
Sorry for the bad image... don't have the car onsite right now :-)
[QUOTE=De Jeeper;17367100 Assumptions based on sn have been wrong.[/QUOTE]
This. There has been several reports of the serial numbers not telling the whole story or even being correct. I'm an example. Replacement X51 engine but the AT and S markings are not there. Go figure.
Huh? You have a 99 996 and a Porsche dealer changed out the engine in 2009? Why? The original 99 engine was probably a dual row IMSB. Very low failure rate. The AT replacement engine is anybody's guess, but probably the large IMSB which requires the engine case to be split but also has the lowest failure rate of all. I wouldn't touch it. The AT is a replacement engine, but it is anyone's guess when it was actually made. Maybe only Porsche in Stuttgart knows.
Yes 99 Cab, with engine replaced by Porsche in 2009. The previous owner provided all the paperwork. To your point it was one of the reasons I was looking for a 99 ;-)
There was no additional data on the reason.
I appreciate this forum and all that make it a great place. Thank you!
Either way, your IMSB concerns can be put to rest (for now) till it's time for a clutch. Then you'll know what's in there. If it's the large 997 type, just remove the grease seal. If it's the dual row then you have some options to think about.
Just drive it hard (they like that) and enjoy!
