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| Re: [GMCnet] Air bag isolator kit [message #289383 is a reply to message #289379] |
Sun, 25 October 2015 14:53   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Your concern is justified, however we have not had any fail due to fatigue
from vibration in 10 years we have been supplying them.( sold over 300
pairs)
Should the tire separate, it can catch it and shear off .
On Sun, Oct 25, 2015 at 12:42 PM, A. wrote:
> Jack Ramsey wrote on Sun, 25 October 2015 10:24
>> Installed the air bag isolator kit last night so I could start on the
> rest of the air system.
>> That's a bit of weight hanging off a moving suspension piece. Possibly I
> am being overly cautious, but practical
>> physics tells me not to drive across the country like this unless I have
> to.
>>
>>
> http://www.gmcmhphotos.com/photos/mechanical/p59380-air-bag-isolator-kit.html
>>
> http://www.gmcmhphotos.com/photos/mechanical/p59382-air-bag-isolator-kit.html
> I agree. An alternative is to mount the isolator kit on the fender well
> and run a line from it to the bag. That adds another connection that might
> leak some day.
>
> A lot of people just carry a couple of Schrader valves and when they need
> to isolate the bag, take the plumbing out at the bag and install the
> Schrader directly into the bag. Takes a bit longer that turning a valve,
> but will still get you moving again.
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> Upper Alabama
> There will always be a demand for scapegoats. The job sucks, but the work
> is steady.
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Air bag isolator kit [message #289411 is a reply to message #289383] |
Sun, 25 October 2015 18:43 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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I had no trouble with this kit or a similar design on either of the two GMC's that I owned (down to one). It is very nice to be able to isolate the bag in case of a air system failure, or a difficult to find slow leak.
My 4 bag set-up has the cut-offs mounted on the inner fender liner, and I have had no problems with that method either.
Reduce weight on your suspension system by installing JmK's beautiful Eagles or Alcoas. This drops about 30 pounds per wheel immediately. I don't think the little shut-off valve weight would even be noticed in a suspension that was designed for the 16.5" OEM Steel Wheels.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Air bag isolator kit [message #289413 is a reply to message #289379] |
Sun, 25 October 2015 19:27 |
Jack Ramsey
Messages: 82
Registered: December 2012
Location: Tulare, CA
Karma: 1
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Cool..thanks Jim. Nice to hear. Certainty easy to install. Your parts and support has been 100%.
Thanks again,
Jack
Jack Ramsey
Tulare, CA
TZE165V101526
1975 Palm Beach
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| Re: Air bag isolator kit [message #289420 is a reply to message #289413] |
Sun, 25 October 2015 20:59 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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I too was concerned with the valve attached at the air bag. I do realize that many have it installed that way, apparently with no ill effects but it just didn't feel 'right'. I mounted the valve with schrader on the wheel housing and ran the air line to the bags. I suppose the air line could fail and there are now two fittings which are added to the equation that might fail. Not a perfect world I'm afraid. 
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] Air bag isolator kit [message #289423 is a reply to message #289420] |
Sun, 25 October 2015 21:11 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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One more point about the valves: I agree that the valve adds too much
weight to the end of a somewhat delicate plumbing arrangement -- especially
with brass fittings. But that's been well covered; with my 4-bag
manifolds, I went one step farther than anyone's mentioned: It's common to
mount those manifolds on the wheel well liner. Since I didn't like the
prospect of trying to reach them if the bags are deflated, I moved them.
Inside each of the rear doors (Generator and LPG) is where I relocated the
manifolds so that their meters and valves are always accessible, and clean
enough to read.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com
On Sun, Oct 25, 2015 at 9:59 PM, Hal StClair
wrote:
> I too was concerned with the valve attached at the air bag. I do realize
> that many have it installed that way, apparently with no ill effects but it
> just didn't feel 'right'. I mounted the valve with schrader on the wheel
> housing and ran the air line to the bags. I suppose the air line could fail
> and there are now two fittings which are added to the equation that might
> fail. Not a perfect world I'm afraid. :roll:
> Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586,
>
> 1974 Eagle Bus 45',w/slideout
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Air bag isolator kit [message #289428 is a reply to message #289359] |
Sun, 25 October 2015 21:48 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Jack Ramsey wrote on Sun, 25 October 2015 10:24Installed the air bag isolator kit last night so I could start on the rest of the air system.
That's a bit of weight hanging off a moving suspension piece. Possibly I am being overly cautious, but practical
physics tells me not to drive across the country like this unless I have to.
http://www.gmcmhphotos.com/photos/mechanical/p59380-air-bag-isolator-kit.html
http://www.gmcmhphotos.com/photos/mechanical/p59382-air-bag-isolator-kit.html
I agree with your concern. I have seen 2 failures. On was on a Black List call one afternoon on a relatively smooth stretch of Interstate where the bag suddenly went flat. I was happy that the weather was good at the time. The piece of pipe entering the air bag snapped completely. I had to remove the bag and take it to the airport where I had the tools to extract the broken piece of pipe from the bag. The other one was a coach where the bag had a slow leak. Tracking down the leak with gas leak detector we found that the pipe into the bag had a slight crack in it which over time might have been an on the road failure like the first one. I do not have shutoffs installed and have never needed them. I carry a pair of schraders for an emergency. I have never used them. If I were to install shutoffs I would mount them somewhere else and run hose to the bags. There are lot of people running them without a problem (so far).
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Air bag isolator kit [message #289439 is a reply to message #289430] |
Mon, 26 October 2015 08:18 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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On resting the boogies on blocks of wood. I used two pieces (per side) of 4 X 6, about 12 inches long. Placing them in a "T" formation, they fit perfectly under the boogies and carry the load while the GMC is parked. Just used a floor jack to gently lift the coach about 1/2 " so they would slide under the boogies, then released the jack. Makes for a nice stable platform while working inside the coach.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
[Updated on: Mon, 26 October 2015 08:18] Report message to a moderator |
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| Re: Air bag isolator kit [message #289441 is a reply to message #289359] |
Mon, 26 October 2015 08:25 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I crib the bogies with three 4x4s, one on 2. Run the air up, slide them under, and then leave the valves in Lower.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Air bag isolator kit [message #289443 is a reply to message #289430] |
Mon, 26 October 2015 08:57 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Well maybe here
http://www.gmcmhphotos.com/photos/g3174-airbag-cutoff-valve.html
On Sunday, October 25, 2015, Kelvin Dietz wrote:
> On 10/25/2015 7:48 PM, Ken Burton wrote:
>
>> Jack Ramsey wrote on Sun, 25 October 2015 10:24
>>
>>>> Installed the air bag isolator kit last night so I could start on the
>>> rest of the air system.
>>>> That's a bit of weight hanging off a moving suspension piece. Possibly
>>> I am being overly cautious, but practical
>>>> physics tells me not to drive across the country like this unless I
>>> have to.
>>>>
>>>>
>>> http://www.gmcmhphotos.com/photos/mechanical/p59380-air-bag-isolator-kit.html
>>>>
>>> http://www.gmcmhphotos.com/photos/mechanical/p59382-air-bag-isolator-kit.html
>>>
>>
> My version is a little less ... "dangly". Been hanging in there for 10+
> years but only about 20,000 miles.
> I don't use the shutoff valves much anymore but there have been a few
> occasions. These were installed before I figured out the whole air system
> so they were used ALL the time for a few years. They unscrew easily, too.
> I rotated my bags every year for the first couple I owned it so that was
> handy. Now I air down and rest the bogie box on a block of wood. Haven't
> rotated the bags in years and no hot-dogging.
>
> This and the next three pics. Just another option.
>
> http://www.gmcmhphotos.com/photos/fresh-paint-dec-2012/p55318-clearance-light-delete.html
>
> Kelvin
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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