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N57S shredding serpentine belts
M550d pre-LCI, so with N57S. engine. Shred two serpetine belts - it has only one long one.
Changed tensioner and checked all the pulleys, all are OK and working smoothly.
Noticed that the standard belt is a bit too long and it made contact to tensioner "bolt" i.e. the knob which You use to turn the tensioner. Put a shorter belt. Now that shorter belt been running OK for a month, now noticed that there's rubber pieces at the backside of the belt, like it scrubbing somewhere... Can't see where? Harmonic balancer seems fine also. Any ideas?
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