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New Serpentine Belt Shredded


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My neighbor's 1990 LS400 had the alternator replaced 1 month ago. After about 1000 miles the new serpentine belt started coming apart. the outer two cords (toward the front of the car) have seperated. i will put a new belt on tomorrow. I checked that the alt was not loose, that all the pulleys line up (they appear to) and that the pulleys are not damaged. Any suggestions based on experience why a new belt breaks up after an alternator replacement? i dont think the alternator has any spacers so i douby it could be mounted wrong. I will check the tensioner tomorrow as well well as the damaged belt's length.

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