I put a new serpentine belt on my 95 f 250 4x4 (351w) 2 weeks ago and seemed to be fine up till a few days ago.Now the belt I bought at advanced auto parts they had 2 so I got the better of the 2 belts they had. I bought the Dayco Poly rib belt was about $35.Anyway now 2 weeks later the surpentine belt is squealing everyday but it doesnt start to do it untill the truck hits 30 to 35 mph and over for some reason.I bought that belt spray stuff sprayed all the pulleys still make the squealing.So someone told me since my trucks has over 200k to change the belt tensioner-pully thing.So I got one right from the ford dealer but the old tensioner wont come off its like its locked on.I sprayed it for a few days with Catalyst spray nothing the tensioner is locked on.I even used a big breaker bar with the wrench to try to bust it lose nothing and I think if I pushed it any harder i would snap the bolt inside the tensioner.How the heck can I get this thing off?The belt squealing is really annoying funny thing though the old belt was on there for to many years like 10 years and never did any squeling at all ever.Any thoughts how to get this thing off and why it only makes the squealing sound at 30 to 35mph and over?any info will help thanks

 

Is the belt tight?

Should have went with the Goodyear...

 

This ^^^^ Gatorbacks FTW..

Are all the pulleys spinning without catching when spinning them by hand?

Smog pump locking up?

Belt even tight?

 

yes all the pulleys are good I checked them all.And yes the belt Is tight.Im wondering even though the belt is new if theres something wrong with it?I really want to change the tensioner im pretty sure its bad with all the miles the truck has on it.They didnt have goodyear I got what they had maybe I will try another brand belt.grrrrrrr

 

Cant beat the goodyear gatorbacks. I get mine from Autozone.

 

I could be wrong here but perhaps the tensioner bolt is left-hand thread? I know the pulley mounting bolt is. I changed my tensioner about over a year ago, cannot recall what thread it is.

You could exchange the pulleys as a test to see if that helps you any. I suspect there is something else going on to cause the squealing, but you need to start eliminating other things.

 

The belts still squealing I called the ford dealer and talked to the guys in parts and im turning the tensioner the right way, it still wont come lose cant figure out why.The squealing is getting really bad.

 

For the time being swap the tensioner pulleys.

One of these come in handy in these situations:


Mechanic's Stethoscope