Getting sick of my squeaky fan belt when I got the truck fan belt was old and crapy put a new one on first day it jumped over shredded half of it tensioner bearing was gone replaced the bearing put another new belt on watched it jumped over again but caught it in time all bearing are good other than the power steering pump slides over but I here that's normal what else could it be?

 

Did change the tensioner pulley or the whole assembly?

 

Just the bearing in the pulley

 

Did the arm have a good pull back to it or was it kid of easy to move ?

 

Seemed pretty hard to me

 

Was your old belt wearing on the outside edges at all? If so, something is out of align.

 

Yea wore out on both sides what could be out of line ? And how do I check

 

Double check and make sure your routing is correct. I'm unsure about the 7.3 but many trucks you can route wrong.

 

Yea it's on right and tight but keeps moving over I have the old one on there now it's only half of a belt but it stays on there fine doesn't move

 

You might check the hub on the water pump. I had one that started to come off the shaft, and the belt would ride to the inside, and wore a couple of ribs off the belt.

 

Might be time for the SD tensioner mod.


https://www.ford-trucks.com/forums/1...rade-pics.html

 

Did you get the correct belt? Depending on year some are 6 rib and some are 7 rib, IIRC.

 

It fits on there fine

 

Check the water pump pulley like Tom said. Mine walked on me as well. Look above the miter and line it up between the crank and some other pulleys.

 

^^^^^ Just eye-balling the pulleys from either side (fender) of the engine might identify a pulley that's out of alignment, either one that's too far forward / too far aft, or one that's not in the same "plane" (at a bad angle) as the other pulleys.

In particular, wind up the tensioner and unwind it again, and watch the pulley as you do so. Even if the spring is tight, if there's wear in the body of the tensioner, you'll notice that the angle of the pulley changes as the spring unwinds and it tensions the belt. That can chew up a belt.