The bearings are not affected by tightening that bolt. However, I glad you mentioned it. Does the pulley have any glaze or anything on it? Are you sure they are making it tight enough? Is there a keyway on it?
Try this, before replacing the alt, clean the alt pulley really well with a good cleaner (something like brake cleaner would take all dirt, grease, glaze off. Just don't spray it on anything too hot or where there could be a spark. It is very flamable.
Let me know if that makes a difference.
Wednesday, July 21st, 2010 AT 11:53 PM