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The tensioner is automatic, no adjustment needed. If you threw the serpentine belt then look for a misaligned pulley or worn tensioner wheel. If you need to move the tensioner to get the belt back on then look for a square hole in the tensioner arm. Use a breaker bar with the appropriate sized square (probably 3/4") to move the arm to get the belt back on.

probably tensioner is bad like a failed bearing

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βˆ™ 2011-03-26 21:54:02
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Q: How do you adjust tensioner to replace thrown belt on 1992 buick lesabre wac v6 4.3?
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