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YOUR RESEARCHVerify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Check pully
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
I have now started preparing my Boxster S for its Spring coming out (of storage) and checked the pully...
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check pully' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check pully' (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 performed work without a confirmed outcome
1
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.
Performed · outcome unconfirmed
My original alternator (well, it looks like it had been replaced at some point) pulley was good, but I replaced the alternator with an upgraded 150A 987 one since I added the electric power steering.
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace entire unit
Suggestion or failed attempt
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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.
Discussions that contain suggestions
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Suggestion
When I discovered it, it was because the bearings had also gone south, so the Easy Button was to replace the entire unit.
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run many more miles
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
Discussions
Read evidence and context
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
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
Just wondering as I do not intend to run many more miles on this engine and wonder whether I should put in any effort, or just leave it as is (seeing that most alternators likely have a seized freewheel anyway)...
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace alternator
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
My original alternator (well, it looks like it had been replaced at some point) pulley was good, but I replaced the alternator with an upgraded 150A 987 one since I added the electric power steering.
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run many more miles
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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.
Suggestion
Just wondering as I do not intend to run many more miles on this engine and wonder whether I should put in any effort, or just leave it as is (seeing that most alternators likely have a seized freewheel anyway)...
Verify your alternator pulley! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
986Forum: 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
While rebuilding my spare alternator...
https://986forum.com/forums/performance-technical-chat/87604-rebuilding-alternator.html
... I discovered that the pulley was seized (they are supposed to act like a ratchet, locked in one direction and freewheeling in the other).
So I verified the pulley on my base Boxster that I am selling... and found it was seized also. I bought 2 new pulleys, and installed one in the car. I have now started preparing my Boxster S for its Spring coming out (of storage) and checked the pully... also is seized. Good thing that I bought 2.
That makes 3 seized pulleys out of 3 that I have checked. I am curious to know what other's experience is. I might add that that the pulley on my friend Newart's Cayman also failed, it came apart while driving and threw the accessory belt off, leaving him stranded.
I feel 1/3 of your pain (cuz I only had 1 boxster with a frozen overrunning clutch on the alternator and you have 3).
When I discovered it, it was because the bearings had also gone south, so the Easy Button was to replace the entire unit. That was after somewhere around 175k miles of year round driving in northwest NJ, so plenty of road salt, etc at play.
According to this chart the Porsche part number is the equivalent of the INA F 233525 1 which. in turn. on other sites is the equivalant to the number that you quote.
I think it is safe to assume that all three of these pulleys are original from the factory.
Checked mine today, and seized as well. What is actually the issue with them being seized? It would mean that the engine losing revs (while shifting) will also decelerate the alternator, but is that bad? Or is it a belt tension issue where the alternator starts to push the belt which loosens and might cause an issue?
Just wondering as I do not intend to run many more miles on this engine and wonder whether I should put in any effort, or just leave it as is (seeing that most alternators likely have a seized freewheel anyway)...
My understanding is that when you shift and the RPMs drop the alternator (with a seized pulley) will be pushing the the accessory belt and/or the belt has to act as a brake on the alternator. A working pulley will reduce wear and tear on the alternator and belt.
My original alternator (well, it looks like it had been replaced at some point) pulley was good, but I replaced the alternator with an upgraded 150A 987 one since I added the electric power steering. Not sure if it was strictly necessary, but I'm happy with it.
This is a source reference. Confirm exact model applicability in the original material.
