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Changing serpentine belt


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Getting ready to change out my serpentine belt on rear radiator Knight. Couldn’t find the belt info on any of my books, but did manage to get numbers off the current belt. More of a preventative maintenance so I don’t have to do it on side of road. I have the belt ordered and looking for any tips or tricks to make it go as easy as possible as I know it will not be easy. 
Oh and if anyone has the belt number for the AC compressor, that would be much appreciated as I did not see any numbers on it. 
thanks, Steve
 

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Take the advice of one who has been there and attempted that.  Go to your Cummins authorized distributorship dealer and let them do it for you.  Once you take the belt off and cannot put the new belt on, you are stuck dead in the water.  It's not worth the few bucks you save.  Chuck B Former Diplomat owner.  

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Just changed my serpintine belt on my 2006 Diplomat 400 Cummins. Was not really that difficult especially with 2 people. One person under and one up top . Took us 1hour 15 min. I don't have a seperate belt belt for the AC.  Ray is right, Yes, do change the tensioner at the same time. That is the easy part.

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I have had to change the S-belt twice.  Once when the water pump bearings froze up, and once when the alternator bearings froze up.  You are lucky to be able to pick your time to replace it.  I was on the side of the road both times on a Sunday night!

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  • 3 weeks later...

Following upon this. Got the belt changed.  Not that bad of a deal, well if I have to ever change it again it shouldn’t be. The adjustment bolt on the AC compressor was stuck. Ended up removing the 2bolts that held compressor on, moved it out of the way which allowed me to get to the adjuster. I then removed the whole assembly, took it into the shop and cleaned and lubed it up. As for the belt, inserted a ratchet in the tensioner and then slide a 16” cheater bar over the handle. This gave me leverage as well as got the handle up to where it was easy to get to. Then basically release tension, remove belt and install new one in reverse order. Once belt was off, was able to get to tensioner bolt from bottom and replaced it.  Reattached the compressor and tightened adjuster. 13mm and 15mm to loosen mount bolts, 18mm for compressor adjuster and 1/2” ratchet with 16” cheater for tensioner. 

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