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PostPosted: Sat Dec 28, 2013 1:06 pm 
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Joined: Mon Aug 05, 2013 4:35 pm
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Location: Fredericton, NB
just thought i'd share this

in trying to repair my MP 40, i needed a way to test out different material for a seal, but didn't want to lose a CO2 cartridge every time, so i came up with this, i had a spare valve stem in my garage, and a lot of spent CO2 cartridges, so i just drilled a hole in one of them, and after trimming the base of the stem, i just put it in and sealed the deal with JB weld, then the only thing i needed to do was to install the cartridge like i would if it were full, then fill the cartridge with my air compressor, the funny thing is......it works :shock:


BTW, i didn't need new material to repair the valve, i just turned the seal the other side, and it worked, its holding air now

Paul

edit; it was holding out of the gun, but not inside of it, i'll keep looking for other material, at least i won't waste CO2 while doing it


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PostPosted: Sat Dec 28, 2013 2:07 pm 
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Location: New Brunswick
Not a bad idea.

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PostPosted: Sat Dec 28, 2013 3:55 pm 
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Neat idea, but I'd be worried about that valve letting go at an inopportune moment. What pressure were you filling to?


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PostPosted: Sat Dec 28, 2013 4:06 pm 
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this device is only to test for leaks, not shooting, so i fill it and listen, if i can't hear any leaks, i just let the pressure out thru the stem itself, and not by firing the gun

i fill it between 40 and 60 psi, i went as high as 90 for the sake of trying it, or as i see it, not going above the psi the stem was designed to take

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PostPosted: Sat Dec 28, 2013 5:10 pm 
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Nice little device there robipaul 8) but you do realize that some leaks will only show up at a much higher a PSI :wink:

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PostPosted: Sat Dec 28, 2013 5:46 pm 
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ya Ace

i kind of figured that one, wonder what the psi gets to be when using CO2

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PostPosted: Sat Dec 28, 2013 5:54 pm 
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CO2 pressure varies with temperature, but a typical value is 900 psi at room temperature.
So, your leak tester looks neat - but will only capture the big leaks. :drinkers:

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PostPosted: Sat Dec 28, 2013 6:18 pm 
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thx Dukemeister

didn't think it was that high :shock: , good to know

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