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One of your pulleys is out of alignment or the bearings are going out. Sometimes if the belt is way overtightened it will jump off from metal brackets bending.

The fault is the centrifugal alternator pulley.Buy a new pulley or the easier way is to fit a new alternator,the pulley is very hard to change.

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Q: I own a Renault scenic 19dci 2001 do they do a modified alternator pulley as my belt keep jumping and shredding?
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