Chirping noise driving me mad! - MINI Cooper Forum

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post #1 of 4 (permalink) Old Jul 31st, 2014, 10:43 PM Thread Starter
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Chirping noise driving me mad!

Hi.I have a Mini Cooper R56 2007.I have a funny chirping noise coming from
the engine.It seems to be worse when the car gets warm.It seems to go when I put the aircon on or when the car revs above 1000 rpm.I have replaced the V belt and alternator pully but to no avail! Any help would be much appreciated

COOPER S
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post #2 of 4 (permalink) Old Aug 1st, 2014, 09:47 AM
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Its sounds very much like its to do with a belt thats making the noise, sometimes if the pulleys are misaligned face to face it causes the belt to come out of its pulley V groove out of square and as it rubs on the side of the vee it squeaks.
Alignment problems can occur if say a new alternator had been fitted and not shimmed up to align it correctly to align it with the other pulleys.

To check if it is a belt, if you have the engine running and carefully spray something like WD40 quickly on the belts and it will immediately go quiet for a while if its to do with the belts.

If that cures it temporarily, then check the pulley alignment, if ok, then fit a new belt and roughen up the pulley belt grooves with a piece of sandpaper to remove the shine?

Or secondly it could be a belt tensioner wheel that has a dry or worn bearing?
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post #3 of 4 (permalink) Old Aug 1st, 2014, 12:42 PM Thread Starter
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Originally Posted by The Nun View Post
Its sounds very much like its to do with a belt thats making the noise, sometimes if the pulleys are misaligned face to face it causes the belt to come out of its pulley V groove out of square and as it rubs on the side of the vee it squeaks.
Alignment problems can occur if say a new alternator had been fitted and not shimmed up to align it correctly to align it with the other pulleys.

To check if it is a belt, if you have the engine running and carefully spray something like WD40 quickly on the belts and it will immediately go quiet for a while if its to do with the belts.

If that cures it temporarily, then check the pulley alignment, if ok, then fit a new belt and roughen up the pulley belt grooves with a piece of sandpaper to remove the shine?

Or secondly it could be a belt tensioner wheel that has a dry or worn bearing?
Hi.Thanks for you reply.The workshop have replaced the belt and alternator pully but it seems to have made it worse? Could be worth changing the tensioner

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post #4 of 4 (permalink) Old Aug 1st, 2014, 01:55 PM
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Try the WD40 test first to establish it is the belt making the noise though, and nothing else?
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