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Have a knocking noise on belt tensioner?

the bearing appears to be fine, is the spring goning bad in the tensioner to cause this noise? 3.8 litre buick 1991 year.
dave s., July 2010
some bearings can appear to be ok but when a load is exerted they can whine and rumble,wouldn`t take any chances,replace the tensioner.

wickham, July 2010
link Click here to see other fixes for Buick 3.8 litre.