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I found this on another website. You need a belt tension gauge. Napa has one called a Krikit II which runs about $14 and fits in your pocket like a pen. New belts, ones with less than 15 minutes on them need to be adjusted to 190lbs. Used belts need to adjusted to 160lbs. After 3 week he said his sat at about 170lbs.

After somemore investigation is turn out the Krikit II deflection gauge is made by Goodyear.

Here is a link: http://www.goodyearindustrialproducts.com/polyurethanebelts/bt_method3.html

I'd check with Jeep to comfirm the lbs. of deflection.

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Q: 99 Jeep Wrangler with a mechanical tensioner for the serpentine belt How do you know when the belt is tight enough Right now everything works fine but when the AC is on the belt flutters.?
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