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Old 08-22-2010, 05:25 PM   #1 (permalink)
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Belt tensioner

How do you tell if the belt tensioner is wore out?? My belt is being pushed into the a/c compressor eating the inner 2 ribs of the belt. Belt does have some slack as it comes up from the a/c compressor to the alternator.
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Old 08-22-2010, 05:50 PM   #2 (permalink)
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their is actually a fancy little tool you use for checking the belt tension. something like a fish scale, pull xx pounds of tension and you should have xx amount of deflection. Dont recall the specs, but thats how its done
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Old 10-09-2010, 07:38 PM   #3 (permalink)
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Belt tensioner should move side to side about 1/8 to 3/16 of an inch when idle. more than that replace it.
hitting a/c replace it.
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Old 10-10-2010, 02:22 AM   #4 (permalink)
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Originally Posted by BeeGee View Post
My belt is being pushed into the a/c compressor eating the inner 2 ribs of the belt.
You answered your own question. The two pieces of the tensioner have a teflon disk between them. When it wears out the belt won't run true. Easy to replace, and I recommend you get a genuine Cummins part so you won't have to do it again for quite a few years. (I've only replaced mine once).
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Old 03-25-2011, 10:44 AM   #5 (permalink)
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some pics

So we know what we are talking...
BELT TENSIONER CUMMINS ISB 3912254

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Old 03-25-2011, 02:58 PM   #6 (permalink)
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Can you replace just the teflon piece or is it best to replace the whole tensionor

Also how do you change it I can't get the tensionor to "relax" before my breaker bar hits the fan thanks
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Old 03-27-2011, 10:22 PM   #7 (permalink)
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Originally Posted by Nadep_Cowboy View Post
Can you replace just the teflon piece or is it best to replace the whole tensionor

Also how do you change it I can't get the tensionor to "relax" before my breaker bar hits the fan thanks
I don't think there is a source for the teflon piece. The bearing wears and the spring loses tension, just replace the assy.

I don't know what to tell you. Try using a ratchet.
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Old 03-29-2011, 11:30 AM   #8 (permalink)
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Originally Posted by Nadep_Cowboy View Post
Can you replace just the teflon piece or is it best to replace the whole tensionor
I had problems with the piece of teflon, I had to replace with a rolled steel, which can be disassembled and maintenance of the bearings.

I'm sure you can change the piece of teflon.
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Old 03-30-2011, 12:04 AM   #9 (permalink)
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Is the mount bolt left or right hand threaded.
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Old 03-30-2011, 12:22 AM   #10 (permalink)
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normal thread....
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