17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlternator retaining tab broke
Leading reported evidence
Replace ordered a new part
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
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Performed · outcome unconfirmed · Original poster
Ordered a new part from the local dealer and the orignal part was replaced by a 997 part number.
Leading evidence: 'Replace ordered a new part' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'casting' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace ordered a new part' (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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Discussions that suspect a cause
1
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Suspected cause · Original poster
I still don't fully understand what happend but maybe it was the casting that let go first.
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.
17 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: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The tab that's part of the cover plate that bolts to the block snapped on my '99. I think the long bolt that holds the alternator in that U channel came loose, moved the alternator way out of position then snapped of the left tad, shredding the belt and burning a nice hole on the bottom of the oil filler tube. Has this happened to anyone? I think its one of those freak things that isn't too common to occur. I must have not tightenned the long alternator bolt (the one that has the idler on it) and over 15K kms, it finally came loose.
Its not the tab on the alternator that snapped but the tab that is part of a coolant passage cover that is bolted to the block. The tab that has a steel bushing and a shirt bolt goes through it to hold the alternator in place. I noticed a problem when the powersteering was dead. No noise of any kind. Car was driven normally before but we have some deep potholes from the winter so maybe the long bolt wasn't fully tightenned and got jogged when I hit a pothole. The dash lit up like a christmas tree so I was occupied by that for a few minutes before figured out the belt must have snapped. Thrn I looked at the temp gauge and noticed it was starting to go up. Pulled over very shortly in the closest patking lot. And then towed it home with a rope and my rusty diesel Jetta that had a "Porsche support vehicle" sticker on the back. As soon as we pulled out of the parking lot with the cars, a Ferrari passed the other way looking. Lol
1. Damn about time it broke.
2. JB weld and Gorilla duct tape.
Seriously, glad nothing else got damaged. I had a belt snap on me before in my BMW that caused a lot if collateral damage.
Ordered a new part from the local dealer and the orignal part was replaced by a 997 part number. I'm guessing they made it a bit stronger than the original. The point where the tab broke had very little material.
I was thinking the same. The crappy part is that the filler tube is only a year and a half old. I still don't fully understand what happend but maybe it was the casting that let go first.
Yea, like you said there's not much material to begin with. If the bolt on the u channel was not tight enough, it's not hard to imagine...Is the alternator seized?
The alternator and everything else spins fine. I had the family in the car so Inwas behaving and drve like a normal person, otherwise oil might have been everywhere.
The wife was glad it broke while I was driving and not her.
I've been thinking why that tab broke. By the way, the new part has a 997 number so Porsche knew there was a problem. My alternator doesn't have a clutch, just a normal pulley. Starting to think that the stress of a clutchless pulley caused this failure. The new part looks a bit beefier.
