Wear on alternator belt

[mr_maxime]

When checking belt tension this afternoon, I noticed a line where belt material had been getting thrown off the belt. I recently added DriveStainless's tensioner and I had to remove some washers because the bend wasn't like the one on my car. I can tell the wear is towards the engine, but is there a good way to figure out what is causing the problem? The wear appears minimal right now, so I'd really like to fix this before it gets worse. I did have to retighten the belt though.

https://i.imgur.com/AeCTkyH.jpg

[81dmc]

When checking belt tension this afternoon, I noticed a line where belt material had been getting thrown off the belt. I recently added DriveStainless's tensioner and I had to remove some washers because the bend wasn't like the one on my car. I can tell the wear is towards the engine, but is there a good way to figure out what is causing the problem? The wear appears minimal right now, so I'd really like to fix this before it gets worse. I did have to retighten the belt though.

https://i.imgur.com/AeCTkyH.jpg

Pull the belt and check if your water pump moves freely.

[mr_maxime]

Water pump spins freely and stops when I let go.

[David T]

Very important that each pulley is in line (the same plane) as the others. Any mis-alignment and you get excessive wear on the belt. You check it with a straightedge or a string. Vee belts don't tolerate mis-alignment well.

[mr_maxime]

I had been told to do that in the past but didnt know how. Guess this is what I was looking for:

https://www.myodesie.com/images/wiki/2/V-Belt_Sheave_Alignment_edit.png