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| [GMCnet] Air bag plumbing size [message #250296] |
Wed, 21 May 2014 20:38  |
<rallymaster
Messages: 361
Registered: May 2014
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Anybody know what size & what thread the airbag inlet is? I have a 45
degree ell, a Schraeder valve and a shutoff valve valve then the air
hoses to the on-board airline plumbing. I'd really like to have the
parts on hand before disassembling anything.
the ell leaks where it is screwed into the airbag, and the valve lever is
broken off the valve, so I can't add air from the coach compressor. It
will leak from about 80 psi to near zilch in 4 or 5 hours.
Or, maybe the airbag fitting leaks where the ell is screwed in. Can I
use somthing to seal the threads when I put it back together?
What are the odds that replacing the ell and the valve will solve my
problem??
Thanks,
RonC
Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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| Re: [GMCnet] Air bag plumbing size [message #250299 is a reply to message #250296] |
Wed, 21 May 2014 21:36  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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That is a problem with adding all of that extra hardware on the end of the air bag fitting. The airbag is constantly bouncing as you drive down the road and the weight of the extra hardware has to be supported by the "elbow" screwed into the bag as it bounces around.
If the air system works correctly then get rid of all of that extra stuff and screw the air hose connector directly into the airbag as GM designed it. If it bothers you that someday you might need to air the bag up separate from the on board compressor, then carry one or two schrader valves and screw them into air the air bag(s) when necessary. I carry two of them in my coach and have never needed them.
I took a local black list call a few years ago from someone who was stranded along the Interstate with what they said was a blown bag. When I got there with a spare bag I found that the problem was not the bag but instead was that first fitting in the bag had broken off flush with the end of the threads of the bag. I ended up installing the spare bag and brought them to my hangar. It took me a couple of hours to extract the old broken piece out of the original bag. By this time it was dark so they stayed over night and we reinstalled the original, now repaired, bag back on the coach the next morning. We also removed all of that extra hardware on the other side and changed it back to stock.
That whole incident added about 1.5 days to their vacation and was caused by something that was totally unnecessary in the first place.
JMHO
I believe all of that stuff is 1/4" pipe thread.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Air bag plumbing size [message #250313 is a reply to message #250299] |
Wed, 21 May 2014 23:44 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Sealing thread can be done with liquid thread seal. Do not use nylon tape that you might use in the house plumbing
On Olga all the hardware in mounted in the wheelwell Thus no extra load is put on the bagconnection
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] Air bag plumbing size [message #250315 is a reply to message #250296] |
Thu, 22 May 2014 00:01 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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1/4" npt
Some may say that adding onto the airbag with shut offs and fill valves is bs but it sure is handy. They will not break off unless over tightened or impacted
IMHO
Todd Sullivan
Sully
77 royale
Seattle
> On May 21, 2014, at 6:38 PM, wrote:
>
>
> Anybody know what size & what thread the airbag inlet is? I have a 45
> degree ell, a Schraeder valve and a shutoff valve valve then the air
> hoses to the on-board airline plumbing. I'd really like to have the
> parts on hand before disassembling anything.
>
> the ell leaks where it is screwed into the airbag, and the valve lever is
> broken off the valve, so I can't add air from the coach compressor. It
> will leak from about 80 psi to near zilch in 4 or 5 hours.
>
> Or, maybe the airbag fitting leaks where the ell is screwed in. Can I
> use somthing to seal the threads when I put it back together?
>
> What are the odds that replacing the ell and the valve will solve my
> problem??
>
> Thanks,
>
> RonC
>
>
> Ron & Linda Clark
> 1978 Eleganza II
> North Plains, ORYGUN
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Air bag plumbing size [message #250317 is a reply to message #250296] |
Thu, 22 May 2014 00:24 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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To find a leak in the air system it is much easier if large portions can be ruled out. The simplest and fastest method I have found is to install a reliable shut off valve on the airbag itself. Once this is done the system can be set to ride height and the bag isolated with the ball valve. If the coach still drops in a similar amount of time then the problem can be isolated to the bag. Sometimes the bags will leak minutely from a multitude of sources which combined are substantial but are hard to detect with soap and water. If the coach still drops with the bag locked out then the bag is at least one of the sources so replace. If the system remains at set height when the bag is locked out then get out the soapy water spray bottle and work your way back to the compressor.
Todd Sullivan
Sully
77 royale
Seattle
> On May 21, 2014, at 6:38 PM, wrote:
>
>
> Anybody know what size & what thread the airbag inlet is? I have a 45
> degree ell, a Schraeder valve and a shutoff valve valve then the air
> hoses to the on-board airline plumbing. I'd really like to have the
> parts on hand before disassembling anything.
>
> the ell leaks where it is screwed into the airbag, and the valve lever is
> broken off the valve, so I can't add air from the coach compressor. It
> will leak from about 80 psi to near zilch in 4 or 5 hours.
>
> Or, maybe the airbag fitting leaks where the ell is screwed in. Can I
> use somthing to seal the threads when I put it back together?
>
> What are the odds that replacing the ell and the valve will solve my
> problem??
>
> Thanks,
>
> RonC
>
>
> Ron & Linda Clark
> 1978 Eleganza II
> North Plains, ORYGUN
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Air bag plumbing size [message #250318 is a reply to message #250296] |
Thu, 22 May 2014 00:26 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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I also wrap all pipe thread connections with 1 1/2 wraps of Teflon tape AND a thin batter of Teflon pipe thread paste. Never had a leak when using both even when breaking the rule of never backing a fitting up a little for alignment.
Todd Sullivan
Sully
77 royale
Seattle
> On May 21, 2014, at 6:38 PM, wrote:
>
>
> Anybody know what size & what thread the airbag inlet is? I have a 45
> degree ell, a Schraeder valve and a shutoff valve valve then the air
> hoses to the on-board airline plumbing. I'd really like to have the
> parts on hand before disassembling anything.
>
> the ell leaks where it is screwed into the airbag, and the valve lever is
> broken off the valve, so I can't add air from the coach compressor. It
> will leak from about 80 psi to near zilch in 4 or 5 hours.
>
> Or, maybe the airbag fitting leaks where the ell is screwed in. Can I
> use somthing to seal the threads when I put it back together?
>
> What are the odds that replacing the ell and the valve will solve my
> problem??
>
> Thanks,
>
> RonC
>
>
> Ron & Linda Clark
> 1978 Eleganza II
> North Plains, ORYGUN
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Air bag plumbing size [message #250321 is a reply to message #250296] |
Thu, 22 May 2014 00:34 |
<rallymaster
Messages: 361
Registered: May 2014
Karma: 2
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Senior Member |
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I found the leak at the junction of the ell and the bag fitting, using
the bubble stuff from the toy store.
That was the first place I squirted, and I saw bubbles immediately.
Maybe a leak elsewhere, also, but that was a big one.
Ron
On Wed, 21 May 2014 22:24:04 -0700 Todd Sullivan
writes:
> To find a leak in the air system it is much easier if large portions
> can be ruled out. The simplest and fastest method I have found is to
> install a reliable shut off valve on the airbag itself. Once this is
> done the system can be set to ride height and the bag isolated with
> the ball valve. If the coach still drops in a similar amount of time
> then the problem can be isolated to the bag. Sometimes the bags will
> leak minutely from a multitude of sources which combined are
> substantial but are hard to detect with soap and water. If the coach
> still drops with the bag locked out then the bag is at least one of
> the sources so replace. If the system remains at set height when the
> bag is locked out then get out the soapy water spray bottle and work
> your way back to the compressor.
>
> Todd Sullivan
>
> Sully
> 77 royale
> Seattle
>
>> On May 21, 2014, at 6:38 PM, wrote:
>>
>>
>> Anybody know what size & what thread the airbag inlet is? I have
> a 45
>> degree ell, a Schraeder valve and a shutoff valve valve then the
> air
>> hoses to the on-board airline plumbing. I'd really like to have
> the
>> parts on hand before disassembling anything.
>>
>> the ell leaks where it is screwed into the airbag, and the valve
> lever is
>> broken off the valve, so I can't add air from the coach
> compressor. It
>> will leak from about 80 psi to near zilch in 4 or 5 hours.
>>
>> Or, maybe the airbag fitting leaks where the ell is screwed in.
> Can I
>> use somthing to seal the threads when I put it back together?
>>
>> What are the odds that replacing the ell and the valve will solve
> my
>> problem??
>>
>> Thanks,
>>
>> RonC
>>
>>
>> Ron & Linda Clark
>> 1978 Eleganza II
>> North Plains, ORYGUN
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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| Re: [GMCnet] Air bag plumbing size [message #250323 is a reply to message #250296] |
Thu, 22 May 2014 00:53 |
<rallymaster
Messages: 361
Registered: May 2014
Karma: 2
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Thanks to all who have shared info with me.
Ron
On May 21, 2014, at 6:38 PM, wrote:
Anybody know what size & what thread the airbag inlet is? I
have a 45 degree ell, a Schraeder valve and a shutoff valve valve then
the
air hoses to the on-board airline plumbing. I'd really like to have
the parts on hand before disassembling anything.
the ell leaks where it is screwed into the airbag, and the valve
lever is broken off the valve, so I can't add air from the coach
compressor. It will leak from about 80 psi to near zilch in 4 or 5
hours.
Or, maybe the airbag fitting leaks where the ell is screwed in.
Can I use somthing to seal the threads when I put it back together?
What are the odds that replacing the ell and the valve will solve
my problem??
Thanks,
RonC
Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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| Re: [GMCnet] Air bag plumbing size [message #250327 is a reply to message #250324] |
Thu, 22 May 2014 06:09 |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Senior Member |
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I like that setup. Just the right amount of overkill and attention to detail. 
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: [GMCnet] Air bag plumbing size [message #250361 is a reply to message #250359] |
Thu, 22 May 2014 12:18 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Blue on passenger side, Grey on driver side for supply air to the bags.
Three different systems. Early with compressor, air tank, and valves all in
front with ride height valves in the wheel wells. Mid production systems
have Compressor and tank
amid ships with rocker switches up front. Still uses pneumatic ride height
valves in wheel wells. Last model is electronic controlled ride height, has
two small compressors, no air tank and fewer hoses. All have their own
quirks , and all work well properly maintained.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On May 22, 2014 9:51 AM, wrote:
>
> Not that bad, Appie, gray might have been better, but it keeps the tubing
> from flopping around.
> I have a 78, so it's a little different.
>
> Looks like Olga has from top to bottom:
> Blue airline-incoming air
> incoming shut-off valve
> Red airline and shut-off to ?? and Schraeder valve.
> Air pressure gauge
> Blue airline and shut-off to ??
>
> Are the lower red and blue airlines for this side air bag and the other
> side airbag?
> Thanks,
> Ron
>
> On Thu, 22 May 2014 02:15:39 -0600 lenze middelberg
> writes:
>> here you go, please disregard that ugly blue plastic box the po
>> mounted
>> http://www.gmcmhphotos.com/photos/data/6489/wheelwell.jpg
>> --
>> Appie
>> eleganza 76 "Olga" ( pictures at
>> http://www.gmcmhphotos.com/photos/g6489-olga.html
>> Volvo v70
>> Denmark
>> _______________________________________________
>> GMCnet mailing list
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>>
>
>
> Ron & Linda Clark
> 1978 Eleganza II
> North Plains, ORYGUN
>
> _______________________________________________
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>
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| Re: [GMCnet] Air bag plumbing size [message #250363 is a reply to message #250296] |
Thu, 22 May 2014 12:38 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Senior Member |
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Top blue. Air in
Blue bag1
Red bag 2
Quadrabag
Same setup in other wheelwel. This allows to control each wheel seperately
After I fixed the hole in one tube it works great
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] Air bag plumbing size [message #250406 is a reply to message #250359] |
Thu, 22 May 2014 18:15 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ron,
You have a 1978 GMC with an Electrolevel III system which is very different from Appie's 1976 GMC with a PowerLevel System.
See MM-X-7725 / Section 4 - REAR SUSPENSION / Page 4B-20 / Figure 27 - Electronic Height Sensor Assembly.
If you don't have that manual here's a link where you can download it:
http://www.bdub.net/factory-manuals.html
Regards,
Rob M.
-----Original Message-----
From: rallymaster@juno.com
Not that bad, Appie, gray might have been better, but it keeps the tubing
from flopping around.
I have a 78, so it's a little different.
Looks like Olga has from top to bottom:
Blue airline-incoming air
incoming shut-off valve
Red airline and shut-off to ?? and Schraeder valve.
Air pressure gauge
Blue airline and shut-off to ??
Are the lower red and blue airlines for this side air bag and the other
side airbag?
Thanks,
Ron
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Air bag plumbing size [message #250423 is a reply to message #250406] |
Thu, 22 May 2014 22:38 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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USAussie wrote on Thu, 22 May 2014 17:15Ron,
You have a 1978 GMC with an Electrolevel III system which is very different from Appie's 1976 GMC with a PowerLevel System.
See MM-X-7725 / Section 4 - REAR SUSPENSION / Page 4B-20 / Figure 27 - Electronic Height Sensor Assembly.
If you don't have that manual here's a link where you can download it:
http://www.bdub.net/factory-manuals.html
Regards,
Rob M.
-----Original Message-----
From: rallymaster@juno.com
Not that bad, Appie, gray might have been better, but it keeps the tubing
from flopping around.
I have a 78, so it's a little different.
Looks like Olga has from top to bottom:
Blue airline-incoming air
incoming shut-off valve
Red airline and shut-off to ?? and Schraeder valve.
Air pressure gauge
Blue airline and shut-off to ??
Are the lower red and blue airlines for this side air bag and the other
side airbag?
Thanks,
Ron
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78's had either a EL I or a EL II depending on when they were built.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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