David Stroud IM Roadster D posted: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.
the problem with the pulleys is old stock ones get worn and begin to have play on the hub or the portion the outer pulley slides over. the hub will have a groove or wear marks on it. if that's fine then the outer portion may be loose or worn where it contacts the hub. we done enough of these I don't bother looking for a good old stock one that we just use the billet cb one. it comes polished, chrome, and black. [sounds like an ad].
other noises the pulleys contribute to is one thinks the fan is rubbing and it's the pulley. or the fan is loose on the hub.
I apologize for the late response, work called.