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Old 04-11-2016, 07:38 PM #1
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Possible to repair Cocker Valve? ? ?

I'm building a 2k1-2k2 STO from the ground up and seem to have a bad valve. Visual inspection looks ok but it doesnt seem to want to seat correctly. played with the pressure but couldnt get the leak to go away only to slow may need a stiffer valve spring or softer main but i would like to avoid buying a new valve any thoughts on repairing sanding, polishing to make it seat better?
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Old 04-11-2016, 07:55 PM #2
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Have you checked the valve oring? Is it a stock or aftermarket valve?
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Old 04-11-2016, 08:49 PM #3
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why would you think its the valve over the cup seal? also did you check the valve oring?
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Old 04-11-2016, 10:27 PM #4
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Does leak with the hammer cock?
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Old 04-12-2016, 11:15 AM #5
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Quote:
Originally Posted by painter4life05 View Post
Have you checked the valve oring? Is it a stock or aftermarket valve?
I was referring to the completed valve assembly as the "Valve" but I do think it is the actual cup seal.

Tried backing off the IVG and turning up the pressure slowed but still leaks more than is really uasable. I have a 45/45 and would be out of air before a game was over. I will pull it back out tonight and take a closer look at the o ring. Pushing on the cocking rod didnt do anything to the leak although with the backblock all the way back it does slow a bit but nothing stops the leak. Oh and its a stock WGP brass valve with a white teflon cup seal. Bought it on ebay for 20 ... may have gotten hosed...
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Old 04-12-2016, 11:17 AM #6
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why would you think its the valve over the cup seal? also did you check the valve oring?
Can you easily tell the difference based on leak or just visually?
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Old 04-12-2016, 11:18 AM #7
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If its leaking down the barrel there's a good chance its the cup seal.
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Old 04-12-2016, 11:21 AM #8
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Does leak with the hammer cock?
yes, it leaks cocked or not. There is a chance the main spring is too stiff it feels stiffer than normal but it still leaks even when cocked so its not pushing on the valve stem making it leak...
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Old 04-12-2016, 11:23 AM #9
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If its leaking down the barrel there's a good chance its the cup seal.
I'm pretty sure that's it, has any one tried to carefully sand or turn a cup seal? I'm thinking about putting it in my drill press and carefully resurfacing the plastic face where it seats on the valve body...
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Old 04-12-2016, 11:41 AM #10
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Quote:
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I'm pretty sure that's it, has any one tried to carefully sand or turn a cup seal? I'm thinking about putting it in my drill press and carefully resurfacing the plastic face where it seats on the valve body...
I've never tried that, but I guess it can't hurt if the alternative is to buy a new one. I shoot mostly CCM guns where the cup seal has an actual o-ring that can be replaced.
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Old 04-12-2016, 12:03 PM #11
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I've never tried that, but I guess it can't hurt if the alternative is to buy a new one. I shoot mostly CCM guns where the cup seal has an actual o-ring that can be replaced.
here goes nothing haha Does anyone know of a cheap place to get a new cup seal when i botch this up? The cheapest new one i could find was 8 bucks but 5 shipping ugh .... its just a little piece of plastic...
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Old 04-12-2016, 10:50 PM #12
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I have tried tapping the valve into the cupseal before. Fixed the problem for me.
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Old 04-13-2016, 10:09 AM #13
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So I tried it last night. Pulled the valve and found that the o ring on the body was trash so i put a new one on then put the cup seal in the drill press and used my pocket knife to lightly shave the surface of the seal flat again it looked pretty good but there was a tiny tiny notch in the plastic. I finished the seal off with a really fine file to make it completely smooth again. Seemed to work perfectly. The only problem is now I'm out of air so I can't test it. It's kind of killing me to know.
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Old 05-05-2016, 03:23 PM #14
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It worked! New o ring and re facing the cup seal = no leaks!
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Old 05-05-2016, 05:34 PM #15
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Nice!
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