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Old 01-23-2022, 04:57 PM   #1
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Cummins 425 ISL Serpentine Belt

I have a 2009 Monaco Camelot with the Cummins 425 ISL (8.9L ?) engine. Any chance someone knows what the serpentine belt number is? It's wore off the current belt and I'm trying to avoid removing it until I have a new one to slap on.
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Old 01-23-2022, 05:10 PM   #2
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This is the belt I use Gates K080745 Micro-V Belt.

My engine is a 400hp ISL, but, would think it would use the same belt.
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Old 01-23-2022, 05:55 PM   #3
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You might check your manual, I have a table toward the back of mine that lists the belt along with other stuff.
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Old 01-24-2022, 04:26 AM   #4
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Quote:
Originally Posted by jacwjames View Post
You might check your manual, I have a table toward the back of mine that lists the belt along with other stuff.

If you don't have a manual, you can download a .pdf version here:
https://www.monacocoach.com/rv-owners-manuals
Then you can search for key words like "belt".

For some reason the last time my Firefox flagged this as an unsafe site but it is fine. Might be security certificate out of date or something like that.
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Old 01-24-2022, 05:22 AM   #5
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I'd take it off, take it with me to an auto parts store, and have them measure it so they can give you the correct replacement belt. Is there a reason you don't want to do that? It's no more work, and you are mostly guaranteed to get the right belt.

BTW, if you can't read the numbers (as you said you cannot), it's definitely time to replace the belt!
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Old 01-24-2022, 07:45 AM   #6
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Originally Posted by n2zon View Post
I'd take it off, take it with me to an auto parts store, and have them measure it so they can give you the correct replacement belt. Is there a reason you don't want to do that? It's no more work, and you are mostly guaranteed to get the right belt.

BTW, if you can't read the numbers (as you said you cannot), it's definitely time to replace the belt!


The ISL runs the water pump off the back of the belt. My numbers “wore off” after about 2 hours on the new belt.
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Old 01-24-2022, 10:46 AM   #7
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Thanks for all the tip guys all very good and helpful! Jacwjames, you were right it was listed in the owner's manual (Cummins 4942431), not sure why I didn't think of that, senior moment I guess...

Thanks again everyone!
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Old 01-26-2022, 10:52 AM   #8
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The ISL runs the water pump off the back of the belt. My numbers “wore off” after about 2 hours on the new belt.
I see. Did you actually go out and look or is this an assumption?

After reading your post, I just had to brave the cold to get into my spares box. (It was a long, difficult trek all the way across the driveway and back to open the compartment, but I made it somehow.)

Here's a pic of the used belt I took off our ISL last year. It was on the coach when we got it, so I don't know the actual mileage. However, we put at least 3-6K miles on it. From its overall condition I'd guess it was in service for 30K miles or likely more, but that's just a guess based on automotive norms for serpentine belt condition.

Whatever its actual mileage and age, the numbers remain legible, as you can see.

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Old 01-26-2022, 10:57 AM   #9
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That's about what mine looked like when I replaced it at about 45,000mi.

Could still get the number off it.
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