Belt tensioner - Dodge Cummins Diesel Forum

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post #1 of 10 (permalink) Old 08-22-2010, 05:25 PM Thread Starter
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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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post #2 of 10 (permalink) Old 08-22-2010, 05:50 PM
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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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post #3 of 10 (permalink) Old 10-09-2010, 07:38 PM
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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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post #4 of 10 (permalink) Old 10-10-2010, 02:22 AM
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Quote:
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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post #5 of 10 (permalink) Old 03-25-2011, 10:44 AM
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some pics

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


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post #6 of 10 (permalink) Old 03-25-2011, 02:58 PM
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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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post #7 of 10 (permalink) Old 03-27-2011, 10:22 PM
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Quote:
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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post #8 of 10 (permalink) Old 03-29-2011, 11:30 AM
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Quote:
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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post #9 of 10 (permalink) Old 03-30-2011, 12:04 AM
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Is the mount bolt left or right hand threaded.

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post #10 of 10 (permalink) Old 03-30-2011, 12:22 AM
So the question is???
 
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normal thread....

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There's a guy floating around here with 780k on his unrebuilt cummins. Now, according to duramax and ford guys, his truck should have fallen completely apart around the engine 7.8 times, since they all know that dodge trucks are junk and only last 100k before they spontaneously disassemble themselves while going down the road. That has happened to me 2.76 times, and both times I was only wearing boxers while driving so it was really embarrassing.
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