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Belt tensioner came apart
Mine did the same thing. I first discovered my belt was shredding lengthwise. About 3 of the 8 grooves were gone and a long piece had been whipping around under my hood tearing up my hood sound insulation.
With 168k miles, I assumed the belt had just finally given out. No big deal, 168k was pretty good.
I bought a new belt (about $40 at Autozone) and put it on, but when I tried it the belt immediately ran off of the AC pulley. I tried a couple more times with the same result. It looked like the smooth wheel on the tensioner was not lined up.
As it turned out, I was able to pull the tensioner apart by hand. The tensioner is made up of two "cups" and a spring. The spring is enclosed in the cups, and one cup rotates around the other. I don't know what is supposed to hold the two cups together, but that is the part that failed on mine allowing the cups to separate and putting the wheels out of alignment.
Autozone had a new tensioner for about $65, but I went ahead and bought a new one from the Ford place for about $126. Put it on and now the belt is staying on.
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99.5 F-250 Lariat Crew PSD, SWB, auto trans, 3.73, 255/85/16D tires, Line-X
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