Help Me Find My Air Reservoir Leak
I have an Edgun .25 R3M that I got at the beginning of this year. A couple of weeks ago I grabbed my gun to go shoot it and it was down to 110bar. I thought maybe I had forgot to fill it up from the last time I shot it. So I filled up the gun again and the next weekend I grabbed the gun to shoot it and it had leaked out 30-40 bar. Last weekend I followed Ed’s youtube video and disassembled the gun to gain access to the o-ring on the screw on the fill valve (not sure it correct name for this part?). I inspected this o-ring for any dirt or debris and it looked fine so I cleaned and regreased the o-ring and put the screw back in and hand threaded it in until the o-ring touched the surface and then tightened it another half of a turn. I reassembled the gun and aired it up and let it sit. So far it is still slowly leaking; It seems to be losing around 2-3 bar per day. Any ideas for me to get this fixed?
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Replacing this o-ring seems to have taken care of my leak, it has been holding air all week so far.
I took the gun apart today and submerged the air reservoir in water. The leak was coming from the small hole in the reservoir. I took it apart and found one of the regulator o-rings had a small gash in it (see pic below). I put new orings on the regulator and put it back together. Now I just have to wait to see if it holds air.
Remove the resevoir and put the air gauge end under water in a clear glass bowl and look for bubbles. You will most likely see small bubbles coming from the fill port.
Even the slightest damage to the oring around the screw will leak. Having the screw too loose will also mean leakage.
If no bubbles from that end try the other end and replace rings as needed.
You have given me some ideas Cad. I think I will remove the air reservoir from the gun to do some more testing to see where the leak is coming from. I will let you know what I find.
It could also be possible that one of the o rings was nicked when you put the reg back in the air- tube, those edges are quite sharp !
You could just put a small bit of spit over the small vent hole on the air tube to see if it’s venting through there, that would tell you if one of the reg o rings is not sealing correctly.
Hope this helps !
The Cad
Great advice CAD, I had forgot the vent hole all together.
A trick I’ve used in the past is to put a balloon over the end of the barrel to see if air is leaking through there (or some other such latex bag :whistle: )
It could also be possible that one of the o rings was nicked when you put the reg back in the air- tube, those edges are quite sharp !
You could just put a small bit of spit over the small vent hole on the air tube to see if it’s venting through there, that would tell you if one of the reg o rings is not sealing correctly.
Hope this helps !
The Cad
Thanks for the reply. The gun only has around 500 rounds through it so far. I removed the regulator and took it apart while I had the gun disassembled last weekend. I looked at the valve stem and I didn’t notice anything wrong with it, although I wasn’t specifically looking for a crack in it. I also but a light layer of grease on the regulator o-rings when I reassembled it. I didn’t know if it was possible for a bag air gauge to cause leak like this? I was thinking about taking the gun apart and setting the air tube in the bath tub full of water to see if I could see where the air was leaking from. I didn’t know if the water could damage or corrode anything?
There is only a couple of potions, leaking around the end plug o-ring or fill screw /check valve deal. Leaking past the reg. o-rings and out the end of the tube, or going through valve stem. How many rounds through the gun, some .25 guns have had stems fail much sooner than smaller calibers but not nearly as fast as the 30’s. It could be that it is cracked but not yet broke. Change out all the needed o-rings, inspect the stem and seat and see what it does, likely will seal, none of my Ed’s have been leakers of that magnitude.
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Good to hear it’s all sorted, I’ve nicked one of these o rings myself when putting the reg back in the air tube – I learnt the hard way with that :whistle:
The Cad