Part arrived and it took less than 10 minutes to replace worn pulley. After several attempts tightening the adjuster head bolt on "center" idler pulley, (again, one at 5pm using the alt as a clock)she now makes NO noise. So nice driving down road without the squeal ! I also learned (and correct me if I'm wrong)that I needed to make sure the adjusting head bolt was pretty tight to alleviate the tiny little squeal still there when I first installed new idler pulley.
I'm hoping this "tightening" sequence doesn't mean that perhaps the alt pulley is making some noise and because I tightened her up pretty good, it quieted it down ? Can anyone tell me just how tight the serpentine belt should actually be ? Mine is on there pretty snug.