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rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHrattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Tighten tension pulley and rattle went away

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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 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 · Original poster
he tightened the tension pulley and rattle went away.
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Replace alternator

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 · Original poster
i started thinking back and i remember the noise started about 600 miles after replacing the alternator...
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'Tighten tension pulley and rattle went away' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace alternator' (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.

Read captured replies

1 matching discussions · 2 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Tighten upper pulley

Performed · outcome unconfirmed

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 · Original poster
went out and tightened the upper pulley to 34 ft-lb - now it's quiet as a mouse.
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace alternator

Suggestion or failed attempt

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 · Original poster
i started thinking back and i remember the noise started about 600 miles after replacing the alternator...
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace belt

Suggestion or failed attempt

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 · Original poster
i replaced the belt before the alternator and wonder if taking it off and putting it back on to do the alternator may have introduced some slack causing it to vibrate.
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace alternator

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 · Original poster
i started thinking back and i remember the noise started about 600 miles after replacing the alternator...
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace belt

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 · Original poster
i replaced the belt before the alternator and wonder if taking it off and putting it back on to do the alternator may have introduced some slack causing it to vibrate.
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Tighten tension pulley and rattle went away

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 · Original poster
he tightened the tension pulley and rattle went away.
Original post Read captured discussion
rattle not heat shield - pulley instead - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Tighten upper pulley

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 · Original poster
went out and tightened the upper pulley to 34 ft-lb - now it's quiet as a mouse.
Original post Read captured discussion
rattle not heat shield - pulley instead - 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.

2 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: 20261027T075545Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

so i thought i had the famous cat heat shield rattle - from reading all the posts it seemed like that was my exact problem. played with it and never got it to go away. was thinking of cutting it off soon because it has gotten worse. i read some posts on another forum and a user mentioned that he had a rattle that seemed like the heat shield but after poking around discovered one of the idle pulleys was loose. he tightened the tension pulley and rattle went away. went out and removed the carpet and heat shield, started it up and lo and behold the noise was actually coming from the front of the engine and transmitting to the rear by what i assume was the exhaust. tightened up one one of the pulley nuts and the noise got a lot less noticible. not gone yet... i started thinking back and i remember the noise started about 600 miles after replacing the alternator... questions: 1. what is the torque value on the nut that's attached to the pulley near the alternator? From Pelican / Wayne Upper Pulley: - 34 ft-lb (46 Nm) for the upper bolt if it's an M10x145 (8.8) bolt - 48 ft-lb (65 Nm) if it's an M10x145 (10.9) Lower Pulley: - The lower pulley is tightened to 17 ft-lb (23 Nm) only 2. i see two pulleys on the parts site i go to, i assume they're not interchangeable. 3. it's a remanned alternator so i wonder if that could be contributing. 4. has anyone else experienced this? i replaced the belt before the alternator and wonder if taking it off and putting it back on to do the alternator may have introduced some slack causing it to vibrate. it does seem to vibrate between the WP and alternator, but i would think of there was a problem it would have shredded by now. i don't see any evidence of it actually rubbing anything.

POST 2 / ORIGINAL POSTEROriginal post

went out and tightened the upper pulley to 34 ft-lb - now it's quiet as a mouse. ill take a drive later to be sure. fyi, it was only at 16 ft-lbs...

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