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Q: squeaky idler pulley

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my issue is i know my pulley needs to be replaced because its squeaking and rubbing but i'm not sure if its best that i replace the just the pulley or the whole tensioner assembly. the belt is fine

A: Replace the entire tensioner assembly since...

Replace the entire tensioner assembly since the tension is what caused the pulley to go bad. You should also replace the belt if any damage is noted.

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