5.0 serpentine belt walking off crank pulley - Ford Truck Enthusiasts Forums



5.0 serpentine belt walking off crank pulley

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Old 05-05-2009, 08:53 PM
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5.0 serpentine belt walking off crank pulley

'92 5.0 f150 with stock brackets with smog pump removed. I tried several different belt sizes and then tried a 88.2 at the recommendation of another post I found on this site. Problem is after cranking 5 or 6 revs and I look down at the crank pulley, it looks like the belt has moved over one groove and is walking toward the radiator. This 88.2 belt is extremely tight, and the tensioner is at almost a 90 degree angle. I had to fight to slip belt under tensioner and it only pushed belt down a little when released. Routing is over the alt., under the tensioner, over the a/c comp., around the ps pump, the back side over the top of the water pump, around the crank and back to alt. The alignment of the pulleys looks pretty good. I am pretty sure I bottomed out the ps pump pulley when I reinstalled pulley. Any ideas? Belt too tight?
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Old 05-06-2009, 12:24 AM
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Take the belt off and see if there is any slop in the water pump, it might not be running true to the crank making it walk of the crank pulley.
-Johnboy
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Old 05-06-2009, 02:45 AM
JJ98 JJ98 is offline
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also check to see if everything is in line did u change somthing water pump or anthing before this started to happen
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Old 05-06-2009, 07:34 AM
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I am going to post a pic of the PS pump showing the distance. I had the pulley off of it, and I thought I had it bottomed out, but I am thinking the pulley was closer to the mount. I can see where the belt should ride by the wear markings on the waterpump pulley and since the belt goes directly from ps pump to water pump the only thing it could be is the ps pump pulley is not bottomed out. I put a straight edge across the ps pump and crank and the ps pump pulley is still about 1/2 to 3/4 further out (toward the front), which would make the belt align itself on the waterpump, thus walking the belt forward 1 groove on the crank. Am I thinking right? I will post a pic shortly.
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Old 05-06-2009, 09:45 AM
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Here are the pics....






Is it me...or does it look like that PS pulley needs to go on more? Looking at this pic now...looks like the belt is at an angle going down to the pump. If anyone has a '92 - 96 f150 with these brackets I would appreciate a pic or a meaurement from the pulley to the bracket.

Do you think the 88.2 belt will be ok as far as tension (due to the tensioner only moving about 1/2" when released)?
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Old 05-07-2009, 02:26 AM
Beanscoot Beanscoot is offline
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That belt looks really crooked and it sounds like it's much too tight. Pulleys don't usually change their location, but carefully check over all your accessories to determine which one is out of plane with the crank pulley.
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Old 03-17-2014, 08:28 PM
coop589 coop589 is offline
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Hi,

Looking through old posts to look and learn how others solved this issue. Did you ever resolve this problem. My Dad's 1990 E-250 5.0L is doing the same thing at the crankshaft. Keeps chewing up the outer edge of the belt. Not sure if it may be the tensioner, or idle pulleys or both.

-Glenn
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Old 03-19-2014, 07:08 PM
jimbbski jimbbski is offline
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First you need to confirm that all of the pulleys are all in alignment. Until you do then nothing else you do will help.
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