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Old 02-27-2012, 10:14 PM   #1
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Problem with gas cock on furnace


Well here is my story... I bought a 91 mobile home and the it has a coleman furnace running off natural gas. I dont have my natural gas put in yet so I converted it over to LP as per the instructions. It was pretty easy. I proceeded to light the pilot tonight and when I turned the gas cock to the pilot postions and pushed down ( this is while I had a long match in the hole) the propane gas started to come out from the gas cock. Scared the crap outta me and the smell was strong. I shut everything off and turned the power off. Do I have to replace the whole valve assembly?

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Old 02-27-2012, 10:21 PM   #2
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Problem with gas cock on furnace


Depending on the gas cock I would say yes. There are some valves that have a nut on the bottom of the valve that you can tighten while holding the top of the valve.

But what is 7 bucks compared to an explosion.

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Old 02-27-2012, 10:33 PM   #3
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Problem with gas cock on furnace


Any reason why they would do that... this was like pushing down on the valve stem of a tire when I pushed down to light the pilot. And ony $7??? I was thinking like 150 bucks?
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Old 02-27-2012, 10:35 PM   #4
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Problem with gas cock on furnace


One of the dozen or so reasons I'd never suggest a DIY work on anything to do with gas.
Please call the gas company and have them take care of it.

Last edited by joecaption; 02-27-2012 at 10:52 PM.
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Old 02-27-2012, 10:37 PM   #5
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Problem with gas cock on furnace


Ok we are not talking about the same thing.

Gas cock = A valve used to turn on/off gas manually by you

Gas Valve = A valve used to control fuel gas into a furnace. Controlled by electronic or switches within the furnace

So, your gas valve leaks when you try to lite the pilot..correct?

Sounds as though when you converted the valve to LP you didn't get the regulator plate back on correctly. If you replaced the spring/
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Old 02-27-2012, 10:38 PM   #6
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Problem with gas cock on furnace


So you converted a valve set up from NG to LG with a spring change kit for the higher pressure for the valve?
I take it you also changed the orifices in the furnace manifold as well?

The valve is not supposed to vent like that and if you soaped it you'd probably find the gas coming out from around the depressed handle.

Yes! Get the valve assy changed. Leaking propane in a confined space is deadly.

I'd also like to hear what you did to switch that unit over to propane?

Last edited by how; 02-27-2012 at 11:05 PM.
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Old 02-27-2012, 10:40 PM   #7
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Problem with gas cock on furnace


Quote:
Originally Posted by joecaption View Post
One of the dozen or so reasons I'd never suggest a DIY work on anything to do with gas.
Please gas the gas company and have them take care of it.


Gas the Gas Company.....Now that's down right funny
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Old 02-27-2012, 10:40 PM   #8
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Problem with gas cock on furnace


Yes you are correct.... I am talking about the gas valve... sorry. Goes from off to pilot then to on.
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Old 02-27-2012, 10:48 PM   #9
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Problem with gas cock on furnace


Quote:
Originally Posted by how View Post
So you converted a valve set up from NG to LG with a spring change kit for the higher pressure for the valve?
I take it you also changed the orifices in the furnace manifold as well?

The valve is not supposed to vent like that and if you soaped it you'd probably find the gas coming out from around the depressed handle.

Yes! Get the valve assy changed. Leaking propane in a confined space is a deadly.

I'd also like to hear what you did to switch that unit over to propane?
No spring was in the kit. And it didnt mention anything about a spring on the directions the on the furnace. Without looking at the diagram on the furnace right now I flipped over the little brass fitting with the plastic cap on top of it to read LP as per instructions... then I pulled the manifold out and changed the orifce out to the .98 LP one. Put it back together and that was it. All the parts where located in the little pouch hanging on the valve assembly.
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Old 02-28-2012, 05:24 AM   #10
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Problem with gas cock on furnace


That is the typical set up for an LP conversion on those Coleman MH furnaces. Sounds like you have a valve with a bad seal in it. Gas valve needs replaced.
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Old 02-28-2012, 12:20 PM   #11
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Problem with gas cock on furnace


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That is the typical set up for an LP conversion on those Coleman MH furnaces. Sounds like you have a valve with a bad seal in it. Gas valve needs replaced.
Thanks. Hope i can find one!
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Old 02-28-2012, 12:23 PM   #12
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Problem with gas cock on furnace


Quote:
Originally Posted by joecaption View Post
One of the dozen or so reasons I'd never suggest a DIY work on anything to do with gas.
Please call the gas company and have them take care of it.
Thats the reason I converted it to propane because the gas wont be put in tell fall.
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Old 02-28-2012, 01:09 PM   #13
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Problem with gas cock on furnace


coleman got taken over by York/Johnson controls but at 22 yrs they may not have a complete paper trail for the parts. try americanhvacparts.com. beware that mobile home units are special and you may have to get it from a RV dealer or mobile home manufacturers service store which specializes in trailer furnace parts. can you get by till fall as you will then have to convert it to gas and make sure the valve is backwards convertible. sounds like a lot of hassle to me. at 22 yrs old the heat exchanger is probably in poor condition so I would think about a new furnace instead. miller/nordyne is the most popular and easy to get parts for.
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Old 02-28-2012, 02:39 PM   #14
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Problem with gas cock on furnace


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Originally Posted by Plumber101 View Post
Gas the Gas Company.....Now that's down right funny
Took me a minute...
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Old 02-28-2012, 06:06 PM   #15
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Problem with gas cock on furnace


Pull that burner assembly and check the heat exchanger before buying a new gas valve. I work on very few of them but have not seen one last more than 15 years before cracking.

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