Home » Public Forums » GMCnet » [GMCnet] I keep blowing out my compressor outlet hose!
| [GMCnet] I keep blowing out my compressor outlet hose! [message #82977] |
Mon, 03 May 2010 23:20  |
glennbrien
Messages: 4
Registered: June 2009
Karma: 0
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Junior Member |
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Relative Newbie here (1 year), looking for advice!
When I bought my coach last year, it had a blown air bag, but it came with all required repair parts and the "threaded rod" in place for transport. I installed the new bag and valve, The system pumped up, and not knowing how long to leave it on or how high it would go, I left it on until the red hose coming out of the second stage of the compressor blew open (I assumed from compressor heat). Fortunately, the check valves kept the system pumped up, and I replaced it (with 160 psi rated ice maker hose and brass compression fittings). Now, whenever I'm warming it up and running the compressor, and I get sidetracked for a bit, it blows that hose (after about 5 minutes or so). I've blown and replaced it about 4 times now.
Now, I figure I've got a stuck pressure relief valve somewhere, since it doesn't seem like GMC would build it without a fail-safe. I've considered replacing it with a run of copper, or a 3000 psi flared hose I have left over frome some equipment I used to work on, but I figure it will just blow at the next weakest point. Can anyone shed any light on this dilemna?
It always blows close to the pump head where it is hottest. I've also considered the possibility that the first hose was 33 years old and the ice machine hose, though 160 psi rated, loses integrity when hot.
Thanks in advance,
Glenn Brien
1976 Eleganza II
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| Re: [GMCnet] I keep blowing out my compressor outlet hose! [message #82980 is a reply to message #82977] |
Mon, 03 May 2010 23:46  |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma: 2
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Senior Member |
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Glenn,
I know you will get lots of responses on this one but I'll start. There is supposed to be a limit switch on the air system that will shut the compressor off when it reaches the maximum pressure - about 125lbs. Apparently that is not working - either broken or out of adjustment. The hoses and fittings in the system are DOT specified for use on air brakes. You should be replacing things with the proper materials for safety's sake. All of these parts are available from one of our suppliers - Jim K at Applied GMC or Jim Bounds at the GMC Coop and others.
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org
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| Re: [GMCnet] I keep blowing out my compressor outlet hose! [message #82981 is a reply to message #82977] |
Mon, 03 May 2010 23:47 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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Does your coach have the original compressor or has it been replaced? There should be a pressure switch that shuts off the compressor when a certain pressure is reached. Removing the cover will reveal a spring loaded switch, and it should be adjustable to turn off the compressor when the correct pressure is reached. Mine seems to shut off at ~140 psi.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] I keep blowing out my compressor outlet hose! [message #82982 is a reply to message #82977] |
Mon, 03 May 2010 23:46 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
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Senior Member |
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Glenn, Glenn here.
The compressor should shut off well before any hose blows. Follow the hose
from the compressor. First stop should be a pressure shut off switch. My
'73 has it mounted on the frame of the radiator, drivers side. Yours could
be busted, disconnected, or even missing.
On Mon, May 3, 2010 at 9:20 PM, <glennbrien@earthlink.net> wrote:
> Relative Newbie here (1 year), looking for advice!
> When I bought my coach last year, it had a blown air bag, but it came with
> all required repair parts and the "threaded rod" in place for transport. I
> installed the new bag and valve, The system pumped up, and not knowing how
> long to leave it on or how high it would go, I left it on until the red hose
> coming out of the second stage of the compressor blew open (I assumed from
> compressor heat). Fortunately, the check valves kept the system pumped up,
> and I replaced it (with 160 psi rated ice maker hose and brass compression
> fittings). Now, whenever I'm warming it up and running the compressor, and
> I get sidetracked for a bit, it blows that hose (after about 5 minutes or
> so). I've blown and replaced it about 4 times now.
> Now, I figure I've got a stuck pressure relief valve somewhere, since it
> doesn't seem like GMC would build it without a fail-safe. I've considered
> replacing it with a run of copper, or a 3000 psi flared hose I have left
> over frome some equipment I used to work on, but I figure it will just blow
> at the next weakest point. Can anyone shed any light on this dilemna?
> It always blows close to the pump head where it is hottest. I've also
> considered the possibility that the first hose was 33 years old and the ice
> machine hose, though 160 psi rated, loses integrity when hot.
> Thanks in advance,
> Glenn Brien
> 1976 Eleganza II
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] I keep blowing out my compressor outlet hose! [message #83033 is a reply to message #82977] |
Tue, 04 May 2010 13:41 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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| glennbrien wrote on Tue, 04 May 2010 00:20 |
Relative Newbie here (1 year), looking for advice!
When I bought my coach last year, it had a blown air bag, but it came with all required repair parts and the "threaded rod" in place for transport. I installed the new bag and valve, The system pumped up, and not knowing how long to leave it on or how high it would go, I left it on until the red hose coming out of the second stage of the compressor blew open (I assumed from compressor heat). Fortunately, the check valves kept the system pumped up, and I replaced it (with 160 psi rated ice maker hose and brass compression fittings). Now, whenever I'm warming it up and running the compressor, and I get sidetracked for a bit, it blows that hose (after about 5 minutes or so). I've blown and replaced it about 4 times now.
Now, I figure I've got a stuck pressure relief valve somewhere, since it doesn't seem like GMC would build it without a fail-safe. I've considered replacing it with a run of copper, or a 3000 psi flared hose I have left over frome some equipment I used to work on, but I figure it will just blow at the next weakest point. Can anyone shed any light on this dilemna?
It always blows close to the pump head where it is hottest. I've also considered the possibility that the first hose was 33 years old and the ice machine hose, though 160 psi rated, loses integrity when hot.
Thanks in advance,
Glenn Brien
1976 Eleganza II
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GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sir: just a thought... compressed air is hot. 160* icemaker tubing might not be enouch. Maybe go to a big truck parts store and get the real airlines like going to the airbag. There is a difference.
C. Boyd
76 Crestmont
East Tennessee
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