xvalve leak

[Boobie817]

I have a leak that i can't fix. This is a reverse xvalve with a lvl x bolt and ULT. First i replaced every O-ring in this gun. It has a new reg piston since i mangled the original trying to open it. It leaks from the vent hole in the back section of the valve. Regardless of the pressure or if im holding the trigger it leaks. I cleaned it out, replaced all the orings and the reg piston and lubed it up. I can't figure out the leak. Any help is appreciated. Thanks

https://youtu.be/rX-Q_JHsU7c

[vintage]

back the velocity ajustment out and see if it stops

[vintage]

back the velocity ajustment out and see if it stops

back it out until it quits then start back in until it starts leaking then out just enough to stop and then chrono it and see what you've got.

[Cyco-Dude]

all right, first carefully examine this exploded diagram and make sure all o-rings are present. disregard the powertube front, as you have a lvl 10 bolt instead of the lvl 7. next, unscrew the regulator and pull out the regulator seat and regulator seat o-ring and make sure there is no debris that could be causing a poor seal.

[Boobie817]

back the velocity ajustment out and see if it stops

Velocity adjustment has no affect on leak. If I keep turning down there's not enough pressure to shoot.

[Boobie817]

I took apart the valve, on off and the power tube sections completely. Cleaned, installed new orings, relubed and this is where I'm at.

[Boobie817]

added a video. someone has to help.

[vintage]

just because the o rings are new doesn't mean they are good, at the operating pressure of a mag a microscopic spec of dirt or bad spot on an o ring can cause your problem. i have an rt classic that i put 2 sets of o rings on the reg piston before i got it to quit leaking. i just noticed you in NYC, 2 of the best techs are very close to you, one on Staten Island and the other in Rutherford NJ. get ahold of BigEvil or Tunaman and they can not only fix it but show you what they did.

[Nobody]

BigEvil uses Jack Daniels and cigar smoke. Tuna uses moonshine and ancient fishing secrets to fix mags.

Joking aside, if you can't fix it, send it to them and ask what was wrong. It very well be a spec of dirt(the mag can be that sensitive) that can cause a leak.

[Cyco-Dude]

"it's leaking from this little vent hole" means the o-rings on the regulator pin assembly are bad, or contaminated with debris. clean or replace. you do not need to remove the little metal 'C' clip on the end; the o-rings can stretch over it. you will have an o-ring, then the split plastic washer, then another o-ring.

take the valve back out and unscrew the regulator. remove the reg seat and reg seat o-ring. the regulator valve pin assembly is inside the valve; pull it out (may take a bit of force). do it over a towel just in case it comes apart and the belleville washers fall off the pin. if they do, make sure to put them back in the correct orientation: ()()()()()

[Boobie817]

"it's leaking from this little vent hole" means the o-rings on the regulator pin assembly are bad, or contaminated with debris. clean or replace. you do not need to remove the little metal 'C' clip on the end; the o-rings can stretch over it. you will have an o-ring, then the split plastic washer, then another o-ring.

take the valve back out and unscrew the regulator. remove the reg seat and reg seat o-ring. the regulator valve pin assembly is inside the valve; pull it out (may take a bit of force). do it over a towel just in case it comes apart and the belleville washers fall off the pin. if they do, make sure to put them back in the correct orientation: ()()()()()

that part is incorrect. the washers are 90 durometer and cant stretch over the c clip. they end up mis shapen, larger in diameter due to stretching and the pin wont go in the valve. i went through a few before i got the clip off. i replaced those already. ive been emailing tuna. unfortunately he stopped responding. thats why i posted the video. I have more coming in the mail. i remember the power tube ones giving me problems too. tolerances are off the wall. no quality control.
the leak is coming from the regulator section. wouldnt that mean that the regulator piston o ring is bad?

[vintage]

I've stretched many of them on and off with no problems. They are snug anyway. I'll bet the problem is somewhere in the pin ass't. We found one at Tunaball that was missing a couple of the washers and that was the problem.

[Cyco-Dude]

that part is incorrect.

that part is correct...i've done it a dozen times. if you're having problems with it, then you're probably doing it wrong...technique is everything. but, if you find it easier to remove the clip, then do it that way. it's just an extra step is all.

the leak is coming from the regulator section. wouldnt that mean that the regulator piston o ring is bad?

no. if the reg seat or reg piston o-ring were bad, it would be leaking from the back of the regulator adjustment nut.

as for no tolerances...i don't know what to say. occasionally i do find some o-rings that are out of whack, but for the most part they've been pretty good.

[athomas]

The leak is definitely one of the two orings on the regulator pin assembly, if the leak is out the side hole in the front half of the valve. If your leak occurs when you air up the gun with the trigger pulled, then the oring closest to the back is the one that is bad. If it only leaks when the trigger is released and sear is forward, then the oring closest to the front is the one that is bad.

It is tough getting the orings off and on, but it is possible. Make sure you inspect the area in the valve where they sit. A piece of dirt here will cause your leak. Wash the end of your regulator pin assembly is light oil to flush and dirt away from the underside of the orings. Just because you can't see any dirt on the outer surface of the orings, doesn't mean there isn't any on the inner sealing surface of the oring and pin.

[Boobie817]

Now that i reread this i think i have the wrong orings in the pin. The one i have are white and hard. Almost plastic, like the lvl x power tube one. I have some 90 durometer that aren't as hard. Just not the size i need. I just ordered some from McMaster. I'm an ass. Thanks guys. I'll update as soon as they come in