BMW M57 X5 Pulley Noise

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Sounds like a bird chirping on start up. This was resolved by replacing harmonic balancer, alternator pulley, and water pump. My guess is the noise was being caused by the alternator pulley.
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Did the sound increase when you accelerated? And did the sound go away after driving for 10-15 min?

-Drein
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Noise 102 % is from crank pulley, i had the same ptoblem, only 10times more sqeek and all the time!

kristapsjurgenbergs