Gordon Nichols posted:
I totally agree with Anthony. Back when VW ran generators, the bearing closest to the fan pulley would dry out and chirp under acceleration. It was pretty common. Install a new bearing and it was cured for a few years. Rinse and repeat.
I have not seen the same thing with the newer alternators (better/bigger sealed bearings?) and totally believe that the back half of the pulley is at fault. Try the rear spacer trick behind the pulley. It’s cheap and easy to do. It’s just a flat washer.
Ok...I haven't had time to get the front pulley apart and Anthony did not answer my question about the possibility of pulley wobble, so Gordon, I'll ask you. What is at fault with the back half of the pulley ? Crooked and wobbles causing belt / pulley chirp ? What would adding a spacer behind the pulley achieve ? Thanks.