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Old 02-24-2012, 10:11 AM   #1
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serpentine belt shreded

hey guys. the brand new belt on my 91 4.0L is shredding. about 1/8"-1/4" sliver has shredded off all the way around. i'm pretty sure there are no sharp edges on my pulleys. what could cause this? too tight?

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Old 02-24-2012, 10:17 AM   #2
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several things come to mind, one of your pulleys is out of alignment, you cot some crap in one of the pulleys, or one of your idler pulleys is going south, i would check your idler pulley remove the belt and check the idler pulleys make sure they spin freely, and are not binding. good luck

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Old 02-24-2012, 10:18 AM   #3
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Could there be a sharp edge touching the belt other than on the pulley?
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Old 02-24-2012, 10:27 AM   #4
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i just rebuilt the engine and when i did for some reason, the harmonic timing chain was up against the front of the block and the harmonic balancer was touching the timing cover before it was even all the way tight, so i did some figuring and put a 1/8" spacer on the nose of the crankshaft to move the gears and chain off the front of the block AND move the harmonic balancer off the timing cover. but I dont think I got the pulleys out of allignment, it simply would not have gone back together without doing this. eyeballing the pulleys they look fine, idk what else the belt could be rubbing on. i'll all the pulleys real good tomorrow when i replace the belt and check them for edges, but i'm fairly certain they're fine.

what is the best way to tighten the belt to the correct tension without the little tester device thing. (no clue what its called)
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Old 02-24-2012, 10:38 AM   #5
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Go to this website, click on the Tech Writeups tab and find belt change writeup. It's a walk through on the whole belt changing job. About half way through is how to get the correct tension. Hope this helps
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Old 02-26-2012, 01:57 AM   #6
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that happened once on my wife's 95 2.5, the power steering pulley was out of alignment just enough to cut off the first rib of the belt
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Old 02-26-2012, 03:14 PM   #7
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You guys that do a lot of wheelin know this, but some others may not..... When you change out your Serpentine belt ( or any belt for that matter...) If the old one is still good ,it's a good idea to put that used belt under the seat or in your tool box, ya never know where your going to be when your Belt gives up. Hard to get home with no Alternator or water pump ! If you happen to change out the belt tensioner , it might be nice to keep one of those too for emergencies . Might not be you, but your friend that needs it to get home.
Just an idea..... "BH"
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Old 02-26-2012, 06:08 PM   #8
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Quote:
Originally Posted by Baby Huey View Post
You guys that do a lot of wheelin know this, but some others may not..... When you change out your Serpentine belt ( or any belt for that matter...) If the old one is still good ,it's a good idea to put that used belt under the seat or in your tool box, ya never know where your going to be when your Belt gives up. Hard to get home with no Alternator or water pump ! If you happen to change out the belt tensioner , it might be nice to keep one of those too for emergencies . Might not be you, but your friend that needs it to get home.
Just an idea..... "BH"
i never throw a belt away unless its broken completely. i put my old one back on

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