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How do I know when to replace the idler pully?

(1990 Chevrolet S10)
in Kalamazoo, MI on August 04, 2009
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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Popular Answer
on August 04, 2009
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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Whether your serpentine belt is squealing or you are performing preventative maintenance, follow our step-by-step guide to replace a worn belt on most vehicles.

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