Know the part# for your Alpine fan belt??

[Jim&MaryJo]

My buddy who owns a 99 Safari Sahara lost a fan belt, while traveling to meet us in Solvang last week.

I used www.truckdown.com to locate an independent mobile diesel truck repair service nearby to get him fixed on the road and avoid a costly tow.

Found a Ventura based service that responded very quickly ($150 charge for the trip and repair), but discovered that you cannot get the belt part number from Cat or Cummins, since they do not sell their engines with accessories (e.g. ac compressor) added by the coach maker.

ABout the time he was preparing to use string to determine the needed fan belt dimension, he found the shredded remains of the old belt and luckily found a piece with the part number.

My buddy had him pick up an extra. On my list of to-dos is to climb under or raise the bed and find the belt part number; maybe order an extra too.

Just thought I'd share this experience...

[Algoma]

The part numbers are listed on the first page of the Maintenance Schedule in your owner's manual.

[EngineerMike]

1. Serpentine Belt, model year 2006 (ISL engine serpentine engine belt + A/C V-belt)
   Serpentine belt= Cummins Part No. 3289224, or Dayco aftermarket part no. 5080685, 8 rib, 1.09” wide, Metric No. 8PK1740, Effective Length 68.5”
   Air Conditioner belt = Dayco #17475, Top Cog GOLD LABEL V-Belt

[Ted III]

I got both of My belts from Cummins. My Serpentine belt is the same as Mike's # 3289224. My A/C belt is Dayco # 17480GL Gold Label V Belt.
This is for my 2005 Alpine W/ 400 ISL Cummins

[Ted III]

I just found my P/L from Cummins & their # for the A/C cog belt is #3040307.

[Jim&MaryJo]

Checked my manual (Thanks Algoma!, didn't consider that...)

My 04 manual lists the drive belt as: Cummins 3912004;
And the AC belt as: Dayco 17475

I would have thought the 04/05 would be the same, but expected 06 to be different.

[RVThere]

Make sure you get a diagram on how the belt goes on.

My Cummins belt snapped last month and the mechanic had no idea on how to route the new belt around 6 pulleys. I called Freightliner with my VIN and they emailed me the diagram within 10 minutes.

[EngineerMike]

Just my opinion, but as to routing, if the mechanic can't figure that out- he needs a lesson.
There are some gas engines these days with bizarrely long belts and I could understand with those; usually the diagram is on a sticker under the hood for passenger vehicles for that reason. But the Cummins is easy; all you have to do is start w/the crank pulley and use common sense from there. On mine the AC pulley is also on the serpentine belt, but still simple starting from the crank pulley (hint: smooth pulley gets smooth side of belt, ribbed gets ribbed).

[Ted III]

Jim & MarJo,
I found the two belts being different be a little odd also so I investigated a little. The 17480 is 48" long and the 17475 is 47.5" long. Otherwise identical. So naturally this makes my belt better than Mike's belt !!!

[RVThere]

Mike - totally agree but I didn't want the mechanic to learn his lesson on my coach while I'm a day late in getting to Williamsburg.

I was up under the engine with him putting the belt on in the confined space between the rear radiator and engine. Not much room (or daylight) to step back and visualize where the belt goes. Since the crankshaft is high and the fan low with the water pump in between, its possible to put the backside of the belt on the water pump from the wrong side and turn your pump in reverse. As a fellow engineer, 'guessing' is not an option when you got a schematic.

PS - Cummins did not have the routing diagram as they just sell the raw engine to FCCC. Plus no sticker anywhere showing the routing.

[EngineerMike]

Tom- I feel for you in that cramped location; not my first choice of duty, but we get what we get.

Since I travel places where the only service is me, I try to anticipate easily solved problems like this. Belt tensioning can be one of those trying problems that there is no common sense method that presents itself. I recommend doing a dry run on engine belt(s) R&R. Buy the spare(s), assemble the tools, take the old belt(s) off & put them back on, have a beer. You may find the process requires tools not ordinarily stocked on board or a study of the method to make it manageable by the side of the road.

On my 06, I found that the AC belt didn't have a pivot type tensioning method, more like sliding the AC compressor on its mounts, and no room to swing a rubber mallet or apply a pry bar. A 3" or 4" C-clamp worked like a charm. So I clamped one on the AC bracket and there it rode. Only needed it once, but there it was. At any rate I knew what the process was, and that the necessary tools were on board.

[D & D Rich]

Jim & Mary Jo,

Good news Mary Jo you don't need to go under the coach or under bed to find your fan belt info. Just lift the rear engine door and the're looking right at you.

First off, I would not trust the manual for the belt info. I would get the numbers off the belts on your coach. If your lucky the numbers will be where you can read them. You can also use a mirror, but you need to read backwards. Or you can check each time you stop the engine until your number comes up. The reason I say don't trust the manual is because I also have a 2004, ISL 400 and the original belts on the coach is Cummins 3289179 and the AC belt is Dayton 17475 13A120 So as you can see the numbers on my ISL400 doesn't match the manual.

I have carried spares for years, because you'll never need them if you have a spare.
My spares for a 2004, ISL 400, are Gates Micro-V K080680 [28mm x 1745mm O.C.. The AC belt is Gates XL 9476 13A1205[1/2" x 47 7/8" 12.5 / 13mm x 1215mm])

I agree with eMike, if your mechanic can't replace the belt without a diagram, get a different mechanic!!!!

Dan R.
2004 FDTS40

[Jim&MaryJo]

Originally Posted by D & D Rich

Jim & Mary Jo,
First off, I would not trust the manual for the belt info. I would get the numbers off the belts on your coach.
Dan R.
2004 FDTS40

Thanks Rich!
I was having trouble trusting the manual, after encountering too many instances where my coach did not track with WRV's supplied documentation.

[Ted III]

This is the best source I have found for Cummins parts and identification https://quickserve.cummins.com/info