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Could be a few things:
Given the belt is shared, and the brackets on accessories can wear out, you may have belt alignment issues. Give it a good eye over- the generator bracket is notoriuos for this. If worn, replace with new / or have a local machine shop re-bush it.
Is there a clatter at all associated? Fiber timing gears failing is very common.
I'd drop a tid bit of oil on every shaft and see if it improves with each item lubed - Generally if the pump were wearing out, you'd have a leak.
Jim
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Jim - '67 122, '71 1800E, '82 242 GLT, '89 240 DL, '95 850 T5
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