Community Forums

gramps66 · 03-23-2020, 10:12 AM

Stranded south of Birmingham Alabama in need of a serpentine belt Rev group is of no help Cummins says belt according to Engine serial number is just a water pump are there two belts or one big belt I have a 400 Cummins 09 holiday rambler endeavor on a roadmaster chassis
Need part number(s)
Any help is very much appreciated thank you in advance

photopilot · 03-23-2020, 10:53 AM

Nobody has answered you, so I’ll let you know what I have, though it’s on a 2006 400 ISL.

Alternator Belt: Dayco 3911581
Air Conditioner Belt: Dayco 15465

You might want to check your tensioner, as a bearing failure will shred the belt.

Walt

gramps66 · 03-23-2020, 10:57 AM

Quote:

Originally Posted by photopilot

Nobody has answered you, so I’ll let you know what I have, though it’s on a 2006 400 ISL.

Alternator Belt: Dayco 3911581

Air Conditioner Belt: Dayco 15465

You might want to check your tensioner, as a bearing failure will shred the belt.

Walt

Do you know off hand your alternator belt does it go around the water pump also right now I do not care about the air conditioner and I have two idler pulley‘s they seem fine spin real easy no excessive play

Martind4 · 03-23-2020, 10:58 AM

Be sure to understand the root cause of the shredded belt, they usually don't fail on their own.

Our AC compressor seized up and it didn't take long for the serpentine belt to fail.

96 Wideglide · 03-23-2020, 10:59 AM

I was going to reply with my belt number (just one), till I realized his Endeavor has a rear radiator, and probably a totally different belt length than my side radiator coach.

gramps66 · 03-23-2020, 11:04 AM

Quote:

Originally Posted by Martind4

Be sure to understand the root cause of the shredded belt, they usually don't fail on their own.

Our AC compressor seized up and it didn't take long for the serpentine belt to fail.

Air compressor pulley spins freel

n2zon · 03-23-2020, 11:27 AM

Call Cummins back with the engine serial number. Ask what the part number is for the belt. That's how I found out what mine was.

photopilot · 03-23-2020, 11:47 AM

To answer your question, yes, the alternator belt also turns the water pump. The A/C belt turns the compressor only. As mentioned above, the Camelot has a side radiator like the Scepter, so I’m not sure if the belt is different. I’m not sure what runs your radiator fan.

Walt

grldst · 03-23-2020, 12:09 PM

I don't think Cummings will be able to help you. You will need to call the chassis manufacturer.

gramps66 · 03-23-2020, 12:25 PM

Quote:

Originally Posted by grldst

I don't think Cummings will be able to help you. You will need to call the chassis manufacturer.

I have called multiple RV dealerships that work on motorhomes I have called Cummins a couple times I have called red group which is the parent company for Monaco holiday rambler they all give me the same number but the mechanic says it is too short

RVThere · 03-23-2020, 12:53 PM

Are you sure he is routing it the right way?

https://www.irv2.com/photopost/showfull.php?photo=19954

Link is for the routing on my ISL 400 on Freightliner but you should be able to get one for your Roadmaster.

clifford j · 03-23-2020, 01:05 PM

Gramps66, google Serpentine Belt Diagram Cummins 2009 400 and see if that is what you have

CLIFFORD

grldst · 03-23-2020, 01:58 PM

If you're sure about the routing....the numbers on the belt you bought will correspond in "mm" the length of the belt. Go back to where you bought the belt and see if they have one that's a bit longer.

Tigerfan1 · 03-23-2020, 02:16 PM

Quote:

Originally Posted by photopilot

Nobody has answered you, so I’ll let you know what I have, though it’s on a 2006 400 ISL.

Alternator Belt: Dayco 3911581

Air Conditioner Belt: Dayco 15465

You might want to check your tensioner, as a bearing failure will shred the belt.

Walt

X 2. I shredded two belts on my last coach. First belt lasted about 70 k miles. Second one only a few thousand. The last belt change I also changed the tensioner and all was good after that.