| [GMCnet] LPG Tank Refinishing [message #122722] |
Fri, 22 April 2011 08:39  |
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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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G'day,
Yesterday I finished up repainting the LPG tank out of Double Trouble and
cleaning up the galvanized compartment it sits in.
I used a soda blaster I got from Harbor Freight to remove the old paint and
loose rust; it worked well.
The instructions that came with the soda blaster noted that it could
generate sparks so to be safe; I purged the tank with shop air for about 5
minutes. I noted the smell of Mercaptan decreased greatly after the purge so
I figured it was safe to proceed and since I am sitting here typing this
obviously I was correct. ;-)
When I removed the gage I noted that the O-ring around the LPG gage sealing
boss was pretty hard.
The o-ring has a square cross section but all I could find were round cross
section o-rings at the local True Value hardware store so I got several
different sizes. They were the typical black material but the box did not
say what the material was.
I put the one with the smallest cross section around the gage float sealing
boss and it looked pretty close to the original o-ring so I installed it.
After applying a bit of anti-seize to the screws I tightened them lightly
until they made contact with the gage face.
From there I screwed them down slowly and sequentially so that it would pull
the gage in straight.
Questions:
1) Is the o-ring a supposed to be a special material?
2) Does anyone know where I can get the correct square cross section o-ring
for the LPG tank gage boss?
John Sharpe mentioned to me that I need to evacuate the cylinder to get the
air out so I did a Google search and found the article below.
http://tinyurl.com/cd36x
http://home.earthlink.net/~derekgore/rvroadiervfulltimingwhatisitreallylike/
id45.html
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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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] LPG Tank Refinishing [message #122730 is a reply to message #122722] |
Fri, 22 April 2011 09:26  |
PettyVTX
Messages: 363
Registered: April 2011
Location: Winder Ga.
Karma: 1
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Senior Member |
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Robert be carefull LP O-Rings are a special material.
We use a lot of O-Rings on out lp tanks for forklifts and they are squared type. But i do know they are SPECIAL we tried regular rings and they disentegrated very quickly. you can get the rings from Amerigas or a lp supplier. some times from an appliance dealer that sells LP stoves.I will look here at the shop and see if we have any laying aroud maybe i can send you one.dont know how fast you have to have one. I will let you know
Ted
Ex Avion now looking for a 23'
Jeep Wrangler Towd
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| Re: [GMCnet] LPG Tank Refinishing [message #122766 is a reply to message #122722] |
Fri, 22 April 2011 12:36 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Rob,
The gauge assembly is made by Rochester Gauges.
This may be close. The gasket material is Buna-N as standard which is
black in color.
http://www.rochestergauges.com/Pages/PDFs/6200.pdf
You could contact them direct or this supplier
http://www.gasequipment.com/newgas/index.html
Regards,
J.R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (Sold)
78 Transmode Custom (Purchase Pending)
1975 Avion (Under Reconstruction)
Michigan
On Apr 22, 2011, at 9:39 AM, Rob Mueller wrote:
> G'day,
>
> Yesterday I finished up repainting the LPG tank out of Double
> Trouble and
> cleaning up the galvanized compartment it sits in.
>
> I used a soda blaster I got from Harbor Freight to remove the old
> paint and
> loose rust; it worked well.
>
> The instructions that came with the soda blaster noted that it could
> generate sparks so to be safe; I purged the tank with shop air for
> about 5
> minutes. I noted the smell of Mercaptan decreased greatly after the
> purge so
> I figured it was safe to proceed and since I am sitting here typing
> this
> obviously I was correct. ;-)
>
> When I removed the gage I noted that the O-ring around the LPG gage
> sealing
> boss was pretty hard.
>
> The o-ring has a square cross section but all I could find were
> round cross
> section o-rings at the local True Value hardware store so I got
> several
> different sizes. They were the typical black material but the box
> did not
> say what the material was.
>
> I put the one with the smallest cross section around the gage float
> sealing
> boss and it looked pretty close to the original o-ring so I
> installed it.
>
> After applying a bit of anti-seize to the screws I tightened them
> lightly
> until they made contact with the gage face.
>
> From there I screwed them down slowly and sequentially so that it
> would pull
> the gage in straight.
>
> Questions:
>
> 1) Is the o-ring a supposed to be a special material?
>
> 2) Does anyone know where I can get the correct square cross section
> o-ring
> for the LPG tank gage boss?
>
> John Sharpe mentioned to me that I need to evacuate the cylinder to
> get the
> air out so I did a Google search and found the article below.
>
> http://tinyurl.com/cd36x
>
> http://home.earthlink.net/~derekgore/rvroadiervfulltimingwhatisitreallylike/
> id45.html
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] LPG Tank Refinishing [message #122773 is a reply to message #122722] |
Fri, 22 April 2011 13:29 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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Rob
From what I understand it is indeed special material. In 2001 when I moved to cold country from Los Angeles my propane tank started pouring liquid propane from that O ring at 1 AM (15 degrees) in a camp ground. After I managed to expell all the propane in the tank I took the old O ring to a local propane co. They had the proper replacement O ring. It has been fine since then.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] LPG Tank Refinishing [message #122836 is a reply to message #122832] |
Fri, 22 April 2011 21:53 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rob,
Just wait 'til you fill that tank! I stopped at Camping World in Byron, GA
today after my usual source in Americus was closed. I expected to take
almost a full tank, 6 gallons. Thank goodness I didn't: 3.6 gallons cost
$14.96!
Ken H.
On Fri, Apr 22, 2011 at 10:07 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> G'day,
>
> Thanks to all the respondents!
>
> Today John Sharpe and I evacuated the LPG cylinder to 28 in hg using his
> air
> conditioning system vacuum pump and charging gage set.
> ...
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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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