Serpentine belt has me stumped - Mustang Evolution

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Old 08-14-2016, 06:25 PM   #1
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Serpentine belt has me stumped

I've now replaced 2 serpentine belts on my 2003 GT due to them being ripped along the width. I cannot understand what is causing it.

Engine bay is stock aside from a vortech v2 supercharger. Could this be due to a bad belt tensioner? Notice in the photos it keeps ripping off the 6th rib on the belt..Click image for larger version

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Old 08-14-2016, 08:50 PM   #2
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Possibly misalignment? Check to make sure all brackets are OK. No missing bolts, bent, cracks and such. Nothing rubbing? Best of luck to Ya.
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Old 08-15-2016, 12:10 AM   #3
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Looking at the pictures, it appears that the idler, tensioner pulley is not aligned properly. That pulley doesn't have any grooves or walls to stablize the belt though. I don't know how that pulley would do anything more than make noise if it was out of alignment.

It is possible that something in the line of accessories is torquing under the load of the supercharger. Have you checked to make sure everything, including the supercharger, A/C compressor, and alternator all all freely spining.

Also pull and push on all of the accessories and their respective pulleys. There should not be any flex or play.

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Old 08-17-2016, 11:37 AM   #4
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Had the same problem with my Procharger. It was out of alignment. Added washers to shim it and now is fine.

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Old 08-18-2016, 08:56 PM   #5
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I'm not running a Paxton but a Kenne Bell blower and had the same problem - eating belts. When I called KB they suggested I contact Thumper Racing in New Jersey and checkout their tensioner so. (They supply Ford Racing with tensioners for their Cobra Jet Mustangs.) It was almost a straight swap for the stock tensioner, since then I've put 10,000 miles on the belt without a problem. An additional point if you bump off the rev limiter with the stock tensioner it causes the belt to "flap" as the tensioner bounces with the rev limiter fluttering. The Thumper tensioner cured the problem - only problem is the price being about $400! Hope this helps.
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Old 08-18-2016, 08:59 PM   #6
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Quote:
Originally Posted by Gil05GT View Post
I'm not running a Paxton but a Kenne Bell blower and had the same problem - eating belts. When I called KB they suggested I contact Thumper Racing in New Jersey and checkout their tensioner so. (They supply Ford Racing with tensioners for their Cobra Jet Mustangs.) It was almost a straight swap for the stock tensioner, since then I've put 10,000 miles on the belt without a problem. An additional point if you bump off the rev limiter with the stock tensioner it causes the belt to "flap" as the tensioner bounces with the rev limiter fluttering. The Thumper tensioner cured the problem - only problem is the price being about $400! Hope this helps.
That is an expensive tensioner. Power costs money though.

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