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either the bolts are loose, bolts are not number 8 bolts, or the belt is to tight and out of alignment

[ADDED] Another possibility is that they were removed and replaced at some time, but over-tightened so over-stressing them. A too-tight belt may or may not affect the bolts, but it will shorten the lives of not only itself, but also the bearings on all the shafts it drives.

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Q: Why does the bolts of the bracket that holds the power steering pump in place breaks for a 1989 Chevy astro van?
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