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Old 06-23-2021, 06:07 PM   #1
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Serpentine belt

Does anybody out there know the routing of a serpentine belt on a cummins ISL9 450hp eng. It's a Winnebago Tour 42qd.
I've tried to pull it up but none match what I have.
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Old 06-23-2021, 06:36 PM   #2
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Quote:
Originally Posted by gouts View Post
Does anybody out there know the routing of a serpentine belt on a cummins ISL9 450hp eng. It's a Winnebago Tour 42qd.
I've tried to pull it up but none match what I have.
All ISC/ISL should be basically like this -

https://rvchassisparts.visonerv.com/.../M120292/s1.pl

I guess if your's has an integrated AC it could be this

Used Caterpillar Motors USED CUMMINS DIESEL MOTOR | CUMMINS DIESEL ENGINE FOR SALE 8.9L ISL425 2007 Cummins Diesel Motors | CUMMINS MOTOR ENGINE FOR SALE ISL425 2007 | caterpillarenginestn.com
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Old 06-23-2021, 07:27 PM   #3
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The bottom one is correct for the ISL. I just had to replace the AC compressor and the belt. If your AC compressor is above the alternator on the drivers side of the engine, then yours is like my ISL 450.

This: https://www.irv2.com/photopost/showp...hp?photo=19954

The diagram on the left is for a rear radiator and the right for a side radiator
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Old 06-23-2021, 09:51 PM   #4
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Thank you
Will try it on Thursday when I get back to the coach.
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Old 06-24-2021, 05:42 AM   #5
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Reminds me I need to take a picture and save under my motorhome folder on my phone.
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Old 06-24-2021, 06:44 AM   #6
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Thank you
Will try it on Thursday when I get back to the coach.
It will be easy with a third hand to hold the tensioner idler with a 1/2" flex handle while you thread the belt.
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Old 06-24-2021, 04:26 PM   #7
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I recently changed the belt on our 42QD and below is the write up that I posted.

Yes and it is kinda of a PITA. You cannot do it from the bottom only you also need access from the top. On my unit the 42QD I removed the divider of the bathroom sink between the cabinet doors then the cabinet bottom, 2 pieces, below that remove the pine wood frame that the cabinet bottom screws to. The frame is to big to get out of the cabinet so I just lifted it up and out of the way so I could then remove the metal access hatch to get to the rear of the engine.
Get under the engine and take the pressure off of the tensioner so you can slip the belt off of the pulleys then go back on top. You will need to remove a small nut and bolt from a bracket that spans from the engine to the outer fan hub and unplug the wire harness it supports so you can remove the belt. Put the new belt on in reverse order. I did most of the work myself except putting the new belt back on since the new belt is smaller and hasnít been stretched out yet. I needed help with the tensioner below so I could reach down through the access hatch and slip the belt onto the idler pulley after it has been placed over all the other pulleys.
The first photo shows the bathroom cabinet with the pine frame in place and the second is looking down through the engine access hatch showing the bracket that you have to take apart.
I can say that now that I have done it I could do it much quicker if I ever needed to.
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