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Old 11-08-2015, 07:40 PM   #1
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Alternator belt

The manual for my Endeavor 2006 gives the part number 3911581 (Dayco) for the alternator belt. I would like to buy one as a spare but I'd like to know if I can trust the manual for the part number. I know that one could look at the one that's installed but I don't do my own maintenance and wouldn't know how to do it. When I go on Dayco's website they seem to have replaced 3911581 by 5080830.
Thanks.
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Old 11-08-2015, 07:55 PM   #2
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I can tell you this. When I changed the belt on my '07 Endeavor ISL the part number in the owners manual was wrong. In fact the book called for a separate A/C belt when in reality their was only one belt. I took the belt to NAPA and matched it manually by length and width. Kept the old one as a spare. I found the manuals supplied with my coach to be riddled with errors.
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Old 11-08-2015, 08:59 PM   #3
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If you don't do your own maintenance, next time you go in for a service have them change the belt and then keep the old one as a spare. If possible see if you can watch (video) how to change it. You will need a ratcheting breaker bar to be able to release the tension. On my rig I have to remove the AC belt to replace the serpentine drive belt. It is not hard to change. I changed mine ~7 years ago and will change again this next month & have 2 spares
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Old 11-09-2015, 03:33 AM   #4
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Quote:
Originally Posted by jacwjames View Post
If you don't do your own maintenance, next time you go in for a service have them change the belt and then keep the old one as a spare. If possible see if you can watch (video) how to change it. You will need a ratcheting breaker bar to be able to release the tension. On my rig I have to remove the AC belt to replace the serpentine drive belt. It is not hard to change. I changed mine ~7 years ago and will change again this next month & have 2 spares
Jim,

Not hard for you because you have a side radiator and the belt is right there when you open the engine compartment doors. Us poor folks who have a rear radiator coach have a much more difficult time changing the belt.

Bob
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Old 11-09-2015, 09:00 AM   #5
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You can go to Cummins Quickserve and sign up for your engine s/n. Once you do that you can find the Cummins p/n for your belt in the parts catalog for your engine. You can then go online and cross reference to a Gates or Dayco belt if you want to.

Roy
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Old 11-09-2015, 04:11 PM   #6
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I just changed ours on the old 92 L-10 with a side radiator, The alternator and AC compressor bolts were a bit suborn but some penetrating oil and a breaker bar got everything freed up. The NAPA part numbers were written right on the existing belts so I ordered off of those in advance. We saved the old ones in our tupperware basement bin for any roadside need later.
Total time both belts and checking the alternator bearing was less than an hour
FOR THE WIN!
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