6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHDIAGNOSIS HELP Alernator whine - bearings?
Leading reported evidence
Replace belt
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
The belt was replaced -- the new belt suspect cause it had rubbed on the water pump pulley.
Leading evidence: 'Replace belt' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is '#1' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check air conditioner clutch or bearing' (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
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Discussions that suspect a cause
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Discussions that suspect a cause
1
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Suspected cause
The belt was replaced -- the new belt suspect cause it had rubbed on the water pump pulley.
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
Check for the air conditioner clutch or bearing to be a cause.
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.
6 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: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I need some opinons on a bit of self diagnosis prior to visiting my indie.
Since fitting my new clutch (maybe red herring or coincidence) I have had a low pitch whine on falling engine revs. The whine is not audible at tickover but is most perceptiible between 2-3k rpm with no throttle as the revs die.
Above 3k rpm the PSE is so loud that I do not hear the whine. The whine seems to be there with clutch in or out but trying to pinpoint today with the engine cover open the whine is hardly audible in the engiine bay but is audible in the cabin again low dull whine - like a moan most audible on a trailing throttle.
On very close engine bay inspection the alternator seems to be slightly rattley/tinkly but the belt seems fairly quiet.
I do not think this is drive train related as it is there in neutral and not moving but is fairly loud and noticeable on the move at low throttle/ engine rpm.
I will get my indie to diagnose this week but thought it may be helpful to get opinion/experience and to create a thread for the search history.
Cheers
Did you install the serpentine belt so it runs in the same direction it did before you removed it? If you never removed the belt nevermind.
However, with the belt removed -- note its direction of travel *before* you remove it -- if the alternator pulley, any pulley, has any play that's not a good sign. (I diagnosed a bad water pump (noisy but impossible to id the pump as the source of the noise) by with the belt removed wiggling all pulleys. One that wiggles, even a bit, is suspect #1.
Check the belt edges. If there is a bad accessory drive chances are good there's enough free play in the bearing(s) to allow the pulley to **** slightly and allow a belt's edge to rub against a pulley side. Thus one belt edge will be sharp. This was present with the belt from my car and and a close inspection of the water pump pulley found evidence the belt was mistracking on just that pulley.
Sincerely,
Macster.
Thanks Macster - clutch was fitted by indie porsche shop so I assume they fitted belts in right direction however I will check belt for uneven wear. Did you get the pulley adjusted or was it necessary to replace anything?
The Boxster water pump replaced by a dealer. I do not know if any adjustment necessary. From what I have seen the accessory drives appear to line up quite accurately. The belt was replaced -- the new belt suspect cause it had rubbed on the water pump pulley.
The Boxster serpentine belt drive has a (spring) tensioner that AFAIK requires no adjustment. I might add the tensioner and all the idler rollers are original and with (now) over 234K miles).
When I had the Turbo's idler roller replaced this too was done at the dealer (thankfully under CPO warranty). Again I do not believe any adjustment is necessary to ensure proper tracking of the belt. An inspection to verify the belt is tracking between the sides of all pulleys is a requirement though just to be sure all is well.
As for belt tension, there might be a tensioning requirement but my sources don't give any particulars.
Sincerely,
Macster.
The little pullys the belt rides on might be the cause if you aren't able to put the noise to a specific spot. They are cheap and easy to replace and a good idea since they will go some time or another anyway.
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