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-   -   ac belt routinely pops off 454 (http://www.airforums.com/forums/f159/ac-belt-routinely-pops-off-454-a-13330.html)

IPM 08-16-2004 09:40 AM

ac belt routinely pops off 454
 
anyone else have this problem? My ac belt comes off routinely in my motorhome. I have installed an idler pulley to keep the belt from jumping so much between the compressor and water pump. That works well till the sealed bearing in the idler pulley wears out. Sure need a better solution.

Any solutions out there?

PS

Galax bluegrass festival was great! Parking via the Walley club was well done as well. Weather was overcast but nearly no rain while we were there.

Motorhome pulled the mountains well, temp never got over 180F, of course I don't pull a toad and I'm only 28'.

swebster 08-16-2004 09:50 AM

My AC has two groves in the pulley. The belt runs around the water pump and around the AC and the Power Steering/Brake pump. Could yours just be misaligned?

IPM 08-16-2004 10:01 AM

One grove pulley in mine. Same belt routing as yours. Yep, the water pump pulley may be pressed too far toward the engine. Rather not change the water pump to test that theory....... but I've no problem with the water pump/alternator belt....

ac compressor looks aligned correctly, I've checked that over and over and over......

overlander63 08-16-2004 10:04 AM

Quote:

Originally Posted by IPM
anyone else have this problem? My ac belt comes off routinely in my motorhome. I have installed an idler pulley to keep the belt from jumping so much between the compressor and water pump. That works well till the sealed bearing in the idler pulley wears out. Sure need a better solution.
Any solutions out there?

Do you have V belts or Serpentine belts on your MH? If you have serp belts, you might be able to find an automatic tensioner, basically what you have, only instead of a manual adjustment, it is a pre-tensioned spring. Also, if you are wearing out bearings on your idler pulley, you have the belt adjusted too tight. A LITTLE belt jumping between puleys is normal, and tends to be more pronounced the further the pulleys are apart.
I am sure you checked to make sure your pulleys are not bent, you may want to have the alignment of the pulleys checked.
Terry

IPM 08-16-2004 10:18 AM

v belts, the pre-tensioned Serpentine type tensioner is a great idea, pulleys not bent, waterpump pulley alignment suspect but not much, yep probably over tension the belt.

74Argosy24MH 08-16-2004 10:57 AM

There are short and long water pumps for BB Chevys and different pulleys for each. Short took a flat pulley. Long should have quite a bit of offset back towards the engine. Wrong pulley?

John

thenewkid64 08-16-2004 02:13 PM

Quote:

Originally Posted by 74Argosy24MH
There are short and long water pumps for BB Chevys and different pulleys for each. Short took a flat pulley. Long should have quite a bit of offset back towards the engine. Wrong pulley?

John


When I did the water pump on my 76 all they could get was a short shaft, did not know there was a diff. Belts jumped (100 miles later and would not keep them on) had to shim the water pump pully out about 3/8 of an inch to get to all line up.

IPM 08-17-2004 06:57 AM

That must be the root of my problem. Wrong water pump. Wrong pulley alignment. Wrong pulley?

Not looking forward to replacing the water pump while the radiator is installed. I think I will also check on shimming the pulley out as well first.

thanks ya'll,

MIke

pillageTHENburn 05-17-2005 10:47 AM

...
 
1 Attachment(s)
I realize this is an older thread, I may need to re-post this elsewhere. But I thought I'd give it a try...

I have a '74 Argosy MH, with a Chevy 454 on a p30. It recently lost a belt and I realized because it got hot (H2O pump quit), and now it would appear that it actually is missing 2 belts. I need to get a belt routing diagram! I have no clue how these should be set up. I've attatched a representation of the pulley layout, the numbers in brackets represent the number of pulley spaces on each shaft. There is currently one small belt that runs directly from the crank to the Power Steering (I think it's the ps) and that is it. I have a hunch that it may be incorrect, I have no idea how it was belted prior to me getting it. It may have been jimmy-rigged. Does anyone have any ideas!? No place here could get me a manual either. AGHHH!!

Thanks in advance for all the help!!
-Logan

TomW 05-17-2005 11:20 AM

I have a 454 in my '84 Suburban, and it has three belts. Although I am not near the truck at the moment, I believe one belt services both the smog pump, and the alternator, another belt spins the water pump & power steering, and the remaining belt runs the A/C & water pump.

If you do not get better replies, PM me and I can pop the hood.

Tom

swebster 05-17-2005 12:19 PM

1 Attachment(s)
Serpentine runs from Crank to Smog to Alternator to Water Pump. V Belt belt runs from Water Pump to A/C to P/S and back to Water Pump. "backup" P/S belt runs from Crank to P/S.

I also used to have a second Smog pump (part of the now removed A.I.R. Emissions system) that sat in between the Alt and the AC. But mine now looks like yours.

till 05-17-2005 12:21 PM

FWIW, how old is the belt, and have you tried fliping it around. I had a new belt that kept poping off. I fliped it end for end and the problem stopped.

Hippo 05-17-2005 12:34 PM

I had the same problem years ago. I found the AC compressor was not lined up with the other pulleys. Had to shim it and it worked.
Chuck

pillageTHENburn 05-17-2005 02:39 PM

Mr. Webster, Thank you!! That is awesome!
The only question I still have is that all pulleys are v-belt pulleys...should I replace any of them with serpentine? I can still do what you've drawn with v-belts right?
Thank you again! Now maybe I can get this thing back home!!
-Logan

74Argosy24MH 05-17-2005 02:56 PM

The belt on the LH side of the engine also needs to go around the crank pulley- crank, water pump, ac compessor, power steering. V belts are what you need. My LH belt is about 60" (Dayco 11A1535 15605 and it could be a little shorter that is why I say about 60"), no smog on mine so my length won't help.

John

pillageTHENburn 05-17-2005 09:08 PM

1 Attachment(s)
Thanks John!
Yeah, the more I looked at it the closer I came to that conclusion, this way all three belts hit the drive pulley. Is this what you mean (see picture)?

swebster 05-17-2005 10:04 PM

That matches my setup

74Argosy24MH 05-18-2005 06:01 AM

And a third "that's it."

John

swebster 05-18-2005 07:31 AM

Logan,
I would add that (at least on mine) the passenger side belt is a wide multi groove belt - bascially a serpentine belt. The others are V-Belts

pillageTHENburn 05-19-2005 01:58 PM

2 Attachment(s)
Hey everyone! Thanks for all the help and advice!! Here's what ended up happening...

I was finally able to find a Kragen that would tell me where the belts should go (which pulleys each belt should hit). what they told me is noted in the first image... I tried it and quickly found that the belt from the crank to the AC rubbed on two other pulleys.
So I ended up running it like it is in the second picture. I hope there is no problem with running the AC pump strictly off of the H2O pump...

Thanks again for all the help!! Now I need to tackle the hot start problem (or lack there-of). I think I have it worked out, but as always advice is more than welcome!!
-Logan


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