Have been having this issue for a while now. Belt will not stop squealing like crazy. When I mount the belt, squealing will stop for a while. Then it will return, seemingly from the water pump pulley. As the belt spins, I’m nearly positive it is moving forward slowly off of the water pump pulley, as it doesn’t seem to line up perfectly after a few rotations. Not 100% sure that’s the source of the sound, but nearly positive.
3rd belt replacement in hopes of that being the issue, mounted the most expensive one I’ve found on SummitRacing. I have tried belt conditioner (I think that stuff is worse than it is better), cleaning the pulleys, and even a bit of deodorant on the belt only silences it for a few minutes. Caused it to slip off the water pump pulley once, so I quickly turned the truck off and replaced it.
1990 MJ 4.0
Any help appreciated, thank you.