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Q: How do I know when to replace the idler pully? on 1990 Chevrolet S10

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the serpentine belt came loose from the assembly but did not break. I found the doughnut shaped pully had fallen off from the bearing race. It was laying down under the radiator fan. Are there two pieces or did something break?
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Sounds like the tensioner just came apart and needs to be replaced. Probably a good idea to replace the belt also. Hope this helps
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