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Old 10-18-2011, 05:55 PM   #1 (permalink)
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Desert Fox info needed

i picked up kind of a rough d.f. on ebay on impulse.
i redid all the seals with a kit from i.c.d.
it had a leak down the barrel so i did some searching on here and noticed a ball bearing in the valve.
mine didnt have this so i bought a few different sizes at the hardware store.
can someone measure the size that is supposed to be in there?
one i have that fits inside the cage still has a leak down the barrel afterwards after its installed.
thanks
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Old 10-18-2011, 07:33 PM   #2 (permalink)
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You probably have a 98 Fox. Those didn't have the ball bearing. Replace the small oring that seals the bolt stem. Should be the same as on an automag.

Read this page: http://www.cognitivevent.com/icd/fox_main.html
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Old 10-18-2011, 07:38 PM   #3 (permalink)
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i replaced that o-ring before. there is a flat disc inside the bolt w/ a o-ring around the outside that seals against the front of the threads on the reg housing.
in the center of that disc is an indent w/ a poly looking seal that isnt an oring that i have no replacement for. it's shaped like a ball bearing could seal in it.
youre probably right though.
ill have to shoot some pics of it and get the ser #
i read in another post a guy screwrd up the bolt tip by taking it off w/ pliers and this one has plier marks all over it...
thanks
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Old 10-18-2011, 07:46 PM   #4 (permalink)
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You can clean up the bolt tip with some emery paper.
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Old 10-18-2011, 07:54 PM   #5 (permalink)
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i found some diagrams at http://cognitivevent.com/icd/images/..._schematic.gif
i have this wich i geuss is the older troublesome valve...
i see im missing one o-ring at location 22 and the ball bearing size is listed here.
ill give that a wirl tomorrow
is it the ouside of the tip that gives issue?
pushing it out of alignment so it wouldnt seal right or something?
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Old 10-18-2011, 08:00 PM   #6 (permalink)
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I think you're ok with wrench marks on the outside of the valve housing tip, so long as it isn't crushed out of round. Polishing them down is definitely an option, for aesthetics.

The main wear o-ring in a 'Fox is #21 on your schematic... I believe it's an 010-size, 90 durometer urethane o-ring. So long as there's nothing wrong with your reg, it's the o-ring that would cause a leak-down-the-barrel type symptom.
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Old 10-18-2011, 08:08 PM   #7 (permalink)
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i see what you mean riddler. that o-ring is the last one that gas passes on its way out.
i have replaced it. ill have to look at the o-ring and shaft and make should they are smooth.
if not it must be coming from further back.
thanks man
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Old 10-18-2011, 08:21 PM   #8 (permalink)
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Yar! I picked up a 'Fox, myself, recently, and had to replace all of the o-rings upon receipt of it. Mine's a '98, though, so I don't have any of that ball bearing shenanigans.
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Old 10-19-2011, 06:59 PM   #9 (permalink)
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thanks for the help so far. today i screwed w/ it a minute, heres some findings
i took it back apart and put another seal in the front its the same clearish poly o-ring
still leaks a bit.
when i crank down the reg so far that the bolt doesnt have enough force to recock itself
and turn the reg back up it doesnt leak with the bolt slightly forward. so i think that tells me that the ball bearing is doing its job as a shut-off.
i thought i might try finding a rubber o-ring that is the same size as the clear piston o-ring. what do you think of that?
i had a similar problem w/ a alley cat the cupseal was a hard material in a rebuild kit i got and it wouldnt seal.
another thing i was thinking was to teflon tape the piston/valve housing threadds incase that is where the leak is coming from. its hard to isolate it w/out being able to pressurize the valve off the gun.
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Old 10-19-2011, 08:39 PM   #10 (permalink)
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Dunno about that... It's THE major wear o-ring in the marker... I'd leave a 90 duro one in there if possible. Are you sure that you're using an 010? And a bit of lube? Sounds simple, but sometimes a bit of lube solves everything.
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