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
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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