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1985 Carrera
Join Date: Jun 2022
Location: Australia
Posts: 109
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911 3.2 Weird Engine Sound at Cold Start (Video)
Hi Team,
My 3.2 has developed a weird sound at start up - Video Link Here - https://www.youtube.com/shorts/GkJfe7jEEpo To me it sounds like the noise is a pulley bearing. I thought perhaps it was the AC or Alternator bearing going, but when putting my ear to them with a screwdriver, it sounds smooth. Also to note, after 10min of driving the sound goes away. As its not a metallic sound, I am scratching my head as to what it is. Any help on this? Has anyone had this before? Sound is definitely coming from the centre of the engine and is loudest near the fan. Thanks. |
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10-18-2022, 06:27 PM
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Registered
Join Date: Dec 2003
Location: Australia
Posts: 344
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I would pull all the belts and run it up and see if the noise persists and work back from there. Probably the only way to determine the fault if any.
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10-18-2022, 08:41 PM
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1985 Carrera
Join Date: Jun 2022
Location: Australia
Posts: 109
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@OSC911 Thanks, I have gone and done that, and luckily the sound has gone
 Now my next task is to isolate between the alternator and the AC. The alternator though when spinning the shaft definitely makes a much worse sound. How much are new alternators going for these days haha
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10-19-2022, 01:21 AM
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Registered
Join Date: Dec 2003
Location: Australia
Posts: 344
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Quote:
Hopefully it is just belt noise which I have heard similar to yours. I would try a set of belts first. |
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10-19-2022, 02:16 AM
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,002
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You should be able to find a local place to rebuild the alternator as well...
Cheers
__________________
Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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10-21-2022, 07:52 PM
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That's fond- just deglaze
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Hi LBEEMING- I listened to your video link- it does sound similar to what I experienced in 2019.
As a further example, I've got Forum member 911 Euro's video of his noise posted in my link... 1986 Alternator replacement- Rumbling noise now gone, hidden bolt on A/C plate My issue did turn out to be the alternator bearings- hope this helps!
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Missed Approach Petra- 1986 Coupe Last edited by Missed Approach; 10-22-2022 at 09:34 AM.. |
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10-22-2022, 08:59 AM
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1985 Carrera
Join Date: Jun 2022
Location: Australia
Posts: 109
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Thanks, appreciate it
I loosened the alternator belt a bit and the noise went. So I am guessing new bearings are required soon! Quote:
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10-27-2022, 07:45 PM
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