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Rattling noise in engine compartment - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHRattling noise in engine compartment - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Use mechanic's stethascope (sp?)

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Suggestion
One way to tell if it's a pulley is to take the front engine cover off and use a mechanic's stethascope (sp?) to listen to each pulley and see if you can find the source of the noise.
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Leading evidence: 'Use mechanic's stethascope (sp?)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use mechanic's stethascope (sp?)' (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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Use mechanic's stethascope (sp?)

No successful repair reported for this finding.

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Suggestion
One way to tell if it's a pulley is to take the front engine cover off and use a mechanic's stethascope (sp?) to listen to each pulley and see if you can find the source of the noise.
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Rattling noise in engine compartment - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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POST 1 / ORIGINAL POSTEROriginal post

Within the last 2 weeks, I have detected a "rattling noise" while at idle coming from the engine compartment. When I initiate the AC, the rattling noise is even more pronounced. Could this be bearing wearing out? Has anyone experienced the same thing. Any clues?

POST 2Original post

Try pushing in the clutch pedal. If the rattling goes away, it's loose springs in the clutch pressure plate. Worth looking into if you have a lot of miles on the clutch.

POST 3Original post

Hi, The List of Possibilities is nearly endless, especially in trying to diagnose it long-distance. You will need to do some investigating on your own, or bring it to a shop. If you DIY, remove the front Engine Cover and get a Mechanic's Stethoscope (under $10). Then carefully move the probe around the front of the Motor paying particular attention to the Pulleys, especially the Idler Pulleys. Then take the appropriate remedies. Hope this helps... Happy Motoring!... Jim'99

POST 4Original post

There are two things that caused rattling in my engine compartment while idling. First was the alternator pulley. Second were the idler pulleys. One way to tell if it's a pulley is to take the front engine cover off and use a mechanic's stethascope (sp?) to listen to each pulley and see if you can find the source of the noise. Good luck!

POST 5Original post

If it sounds a bit "tinny" it could also be a heat shroud. I have a noisy one that someday I'll tighten up.

POST 6Original post

The pressure plate has no springs. The boxster has a dual mass flywheel made by Luk. Link for info http://luktest1.ina.com/content/en/products/dampers/zms_sv/zms_lv/zms_lv.jsp I suspect mine is fuched as it rattles once the engine has warmed up, and goes away on engagement of the clutch... It sounds like ball bearing rattleing.

POST 7Original post

Pull off your top access panel, pull the front panel carpet, and then the front panel so you can see the serpentine belt. Start the car and see if you can pinpoint it. Keep clear of the belt though. If doesn't occur, then put the top access cover on and see if that causes it.

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