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Q: Breaking Belts! Put a new belt on and replaced the tension pulley which was bad. on 2000 Pontiac Grand Am

Worked for a while and broke the second belt. Got a new one and seemed to be fine then it broke also. Noticed a little frey on the outside of the belts before they broke. Most recent belt was destroyed. Notice that the crank shaft pulley was letting the belt walk back off of the pulley. Belt moves back 4 ribs on the crank pulley. The belt is half on and half off the crank pulley. Pulley is tight What would cause this???
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