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03-01-2021, 04:30 PM
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#1
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Junior Member
American Coach Owners Club
Join Date: Mar 2018
Posts: 17
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Serpentine belt
Have had to replace this belt four times in 60k miles
Any idea of what maybe causing it to shred
American Coach with freight chassis and 450 Cummins
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03-01-2021, 04:47 PM
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#2
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,385
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Is it installed the right way? I have seen them put on wrong, and they will rub on the motor mount or crossmember. Just can't remember exactly what. 
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand! 
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03-01-2021, 04:49 PM
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#3
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Registered User
Join Date: Feb 2008
Posts: 3,607
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Have you checked the tensioner, pulley alignment, idler bearings, overall belt tension? Any wear patterns on the belt BEFORE it breaks/shreds?
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03-01-2021, 05:05 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,442
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Alignment problems with the auto tensioner can be an issue .
Can you post a picture of the damaged belt ?
Tensioner issues usually start the damage on one edge and can peal the serpentine belt off one grove at a time .
Does your belt drive both the alternator and dash A/C compressor , as well as the water pump ?
A/C compressor over charge can lead to belt slip and overheating then failure.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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03-01-2021, 06:57 PM
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#5
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,746
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Quote:
Originally Posted by Skip426
Tensioner issues usually start the damage on one edge and can peal the serpentine belt off one grove at a time .
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That's what happened to mine. Lost one groove.
Replaced the belt in Yuma, and waited till I got home to replace the tensioner.
As you can imagine Skip, haven't been able to put enough miles on her lately to find out if the tensioner was the issue  !
Belt's running true though!
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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03-01-2021, 09:29 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,897
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The belt tensioner should be replaced when the belt is replaced:
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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03-02-2021, 06:01 AM
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#7
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,228
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I replaced the belt and the tensioner and took off to the CG 125 miles away. When I got there I walked around to the back of the coach and saw a lot of black spaghetti looking "belt" hanging out of the vents in the hood. Got a "close" belt at an auto parts place and creeped home.
After reading and talking here on iRV2 I took off the new tensioner and saw rust on the steel mount that the tensioner mounted to. I guess it was enough to add a little angle, enough that the belt crept over one groove at a time and was shredded by a pulley or something. I ground it all off and painted it. Remounted the tensioner and haven't had a problem since. 
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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03-03-2021, 09:45 AM
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#8
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Junior Member
American Coach Owners Club
Join Date: Mar 2018
Posts: 17
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Serpentine belt
Thanks for the feedback
Because this has happened to many times I check the belt often and have never seen any wear
I am going to have the ac pressure checked however
3 of the 4 times it was after using the exhaust break and I wondered if the high rpm was contributing
Especially if ac was on also and compressor kicking on or off
I had already decided to avoid that combo in the future
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03-03-2021, 01:39 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 6,575
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Gates makes a green Kevlar belt that is supposed to last much longer than a conventional belt. You will have to cross over the part number.
__________________
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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