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07-30-2022, 04:49 PM
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#1
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Member
Join Date: Oct 2020
Location: Corpus Christi Tx
Posts: 36
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Fan belt
I was doing some maintenance on my bus today and noticed the radiator fan belt was pretty loose. It's always been noisy when it turns on & off. Just wondering if this is normal because I couldn't see a way to adjust it. Thanks, Rob
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 Roberto R.
2014 Allegro 37AP
2020 Jeep Cherokee
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07-30-2022, 04:55 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,492
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Is this a multi grove serpentine belt on a diesel engine ? 
Could be your auto tensioner has seized up .
Have the belt and tensioner ever been replaced ??
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-30-2022, 07:56 PM
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#3
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,124
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I think we have the same MH, 2014 Allegro Bus 37 AP. If so, no that is not normal.
I agree your tensioner is not doing its job. Verify it moves.
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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07-31-2022, 06:56 AM
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#4
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Member
Join Date: Oct 2020
Location: Corpus Christi Tx
Posts: 36
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Thanks but this belt only runs the radiator fan assembly it's not the main belt that has a tensioner.
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Roberto R.
2014 Allegro 37AP
2020 Jeep Cherokee
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07-31-2022, 07:12 AM
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#5
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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Mine is not hear to check, however, I would bet the driven pully is on slotted holes that allow the belt to be loosened, replaced and slid over to tighten it.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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07-31-2022, 08:58 AM
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#6
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,124
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You do have a 2014 Allegro Bus 37AP, correct? (That is what is in your profile. )
If so, you should have this setup. (This is our 2014 Allegro Bus 37AP.)
The pulley for the fan gear box is just to the upper left. The tensioner is bottom right. 
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2014 Tiffin Allegro Bus 37AP
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07-31-2022, 02:59 PM
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#7
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Member
Join Date: Oct 2020
Location: Corpus Christi Tx
Posts: 36
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Thanks DRM901 for the picture, I tried to send you mine but haven't figured out how to attach it. I'm very technically challenged! Lol
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Roberto R.
2014 Allegro 37AP
2020 Jeep Cherokee
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08-01-2022, 03:41 AM
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#8
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Member
Join Date: Oct 2020
Location: Corpus Christi Tx
Posts: 36
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Roberto R.
2014 Allegro 37AP
2020 Jeep Cherokee
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08-01-2022, 06:05 AM
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#9
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,124
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You can see that someone broke the bracket on the tensioner and just replaced the belt without one.
You need to get someone to fix this. Not sure what that person was thinking, and what would have caused the bracket to break. Would make me take it in to a trusted mechanic and have them go over it completely.
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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08-01-2022, 06:38 AM
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#10
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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Now that I see the picture, I remember a problem with that idler bracket breaking. Tiffin came with a modified bracket to replace the OEM one. I found mine cracked and replace it before it broke. I'm not certain, but I think the 2014 model was included in that issue. I remember that it took Tiffin a couple of changes to get the bracket strong enough to hold.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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08-01-2022, 06:43 AM
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#11
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,124
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Tiffin didn't mention it when I checked for any recalls.
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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08-01-2022, 07:10 AM
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#12
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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Quote:
Originally Posted by DRM901
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I don't remember if it was a recall, although I think Tiffin sent it to me at no charge as the coach was only 2 or 3 years old at the time.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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08-01-2022, 08:27 AM
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#13
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Member
Join Date: Oct 2020
Location: Corpus Christi Tx
Posts: 36
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Thanks everyone! Makes sense now, it has no adjustment. I've only had this coach a couple years, have only made small trips while trying to learn about the different systems and work on my retirement. I can now see the broken metal where something is missing! This is my third motorhome I'm impressed with the Tiffin quality over my previous units. Thanks again,
Rob
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Roberto R.
2014 Allegro 37AP
2020 Jeep Cherokee
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08-01-2022, 09:09 AM
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#14
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Senior Member
Tiffin Owners Club Texas Boomers Club
Join Date: Feb 2018
Location: North Texas
Posts: 2,124
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Quote:
Originally Posted by Crasher
I don't remember if it was a recall, although I think Tiffin sent it to me at no charge as the coach was only 2 or 3 years old at the time.
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Your comment made me go out and take a good look at my bracket! Mine looks good.
Sent from my SM-G973U using iRV2 - RV Forum mobile app
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2014 Tiffin Allegro Bus 37AP
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Linear Mode
