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Old 01-17-2022, 04:24 AM   #1
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Serpentine belt size

New to us 2012 Phaeton 42QBH - several recommended a spare belt as part of the “save a trip” kit. However I’ve looked in the tiny Cummins engine book and the Freightliner RV chassis book and have yet to find the part number or sizes for the belt. Can someone steer me in the right direction?

And follow-up: is the belt accessible form the hatch in the bathroom?
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Old 01-17-2022, 05:20 AM   #2
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Good idea to also have a spare tensioner. I think the tensioner is as or more likely to fail as the belt and not much point changing one w/o the other. Some have replaced the bearing only but spring tension / weakness is another concern.
On my Freightliner / Cummins ISB they were able to change both from below without having to move / remove much. I think they did remove an exhaust extension. I found the parts listed @ Cummins parts online.
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Old 01-17-2022, 08:04 AM   #3
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FWIW. If the serpentine belt also runs the AC compressor like my 450 ISL does, I recommend two different belts. One would be a replacement for what you have and a second shorter belt to use in the event your AC compressor should seize up like they sometimes do. It happened to me once and fortunately, Tiffin had included that shorter bypass belt for just such an event. It took three hands to install it, but it also saved a very long delay plus a tow. Call Tiffin and they will give you the part numbers of both belts for your coach.
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Old 01-17-2022, 09:13 AM   #4
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Quote:
Originally Posted by joshjack View Post
New to us 2012 Phaeton 42QBH - several recommended a spare belt as part of the “save a trip” kit. However I’ve looked in the tiny Cummins engine book and the Freightliner RV chassis book and have yet to find the part number or sizes for the belt. Can someone steer me in the right direction?



And follow-up: is the belt accessible form the hatch in the bathroom?


Look at the belts on your coach now. You can see the size printed in the belt.

Click image for larger version

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ID:	354012
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Old 01-17-2022, 09:19 AM   #5
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Quote:
Originally Posted by Crasher View Post
FWIW. If the serpentine belt also runs the AC compressor like my 450 ISL does, I recommend two different belts. One would be a replacement for what you have and a second shorter belt to use in the event your AC compressor should seize up like they sometimes do. It happened to me once and fortunately, Tiffin had included that shorter bypass belt for just such an event. It took three hands to install it, but it also saved a very long delay plus a tow. Call Tiffin and they will give you the part numbers of both belts for your coach.
Interesting post since I've been looking to get a set of belts for my Tiffin. I called Cummins for the main Belt and they provided the Part number for that which was in short supply over the last 6 months I've been looking for one. Tiffin has to provide me with the part number for the shorter one which I assume and from what I can see is the one for the AC. I called last week no answer but left a VM. Got a call back but couldn't answer it so need to call today. I would assume since I have 2 belts already that should cover me for either case. Though I'm wondering would it be back to Cummins for the Belt Tensioner or does someone have one for my year 450ISL?
Thxs to the OP for posting this question got me to think about the tensioner?
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Old 01-17-2022, 09:22 AM   #6
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Look at the belts on your coach now. You can see the size printed in the belt.

Attachment 354012


On the 450 Cummins here is the belt that eliminates the A/C compressor in case you have an enroute A/C compressor locks up so you can continue on your trip.

Click image for larger version

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Old 01-17-2022, 01:30 PM   #7
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So where did you take this picture from? When I open the rear compartment all I see is radiator. Access thru bathroom floor?
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Old 01-17-2022, 04:33 PM   #8
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Originally Posted by jlturner View Post
Look at the belts on your coach now. You can see the size printed in the belt.

Attachment 354012
So how did you access your engine to get this view? Through the rear bathroom floor access?
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Old 01-17-2022, 05:53 PM   #9
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Originally Posted by jlturner View Post
On the 450 Cummins here is the belt that eliminates the A/C compressor in case you have an enroute A/C compressor locks up so you can continue on your trip.

Attachment 354013


Do you know what years? I have a 2015 ISL 380hp.

Also, is it only the compressor that is eliminated or are there other pulleys (e.g., idler)?
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Old 01-20-2022, 08:39 AM   #10
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So how did you access your engine to get this view? Through the rear bathroom floor access?
I'd go under the coach where the engine is and see if you can see the numbers on the belts. That would be the easiest way.

If that doesn't work, remove the floor and see if you can see the belts. Not sure how it is in a 42QBH, but in my 40QTH I was surprised how hard the screws were to find in the carpet.
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Old 01-20-2022, 09:44 AM   #11
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I'd go under the coach where the engine is and see if you can see the numbers on the belts. That would be the easiest way.

If that doesn't work, remove the floor and see if you can see the belts. Not sure how it is in a 42QBH, but in my 40QTH I was surprised how hard the screws were to find in the carpet.
I haven't tried removing it yet, but in the bathroom tile floor there is a large, square hatch that should be directly over the engine. But I will take a look from underneath as well. I haven't had time to really familiarize myself with everything on the coach yet.

I did call Tiffin to ask for the part number and they couldn't pull it up so they sent me to Freightliner who pulled it up right away. But I'm curious to get underneath and verify the PN before ordering one online.
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Old 01-28-2022, 03:38 PM   #12
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Quote:
Originally Posted by jlturner View Post
On the 450 Cummins here is the belt that eliminates the A/C compressor in case you have an enroute A/C compressor locks up so you can continue on your trip.

Attachment 354013
Jeff is that belt good for any year Cummins 450? I'm in the process of getting the two belts plus the belt tensioner but this might still come in handy as well.
Thxs
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