weird classic leak

[rawbutter]

I'm at my wits end here.



I've already replaced all the o-rings in the valve.

If I put this valve on another automag, it leaks. If I put a different valve on this automag, it's okay. So I know it's the valve.

I also know it's not the on/off. I put a brand new RT on/off in there, and it was still acting weird.

Any ideas?

[rawbutter]

Oh, before I forget, the valve back is one of those weird venturi backs with lots of extra holes, just like the one in this picture. Never had one of these before. Could that be part of the issue?

[going_home]

[blackdeath1k]

This may sound really stupid. And I'm saying his because I ran in to this problem a year or so ago. Check the seals that could cause the leak for pet hair. Or very fine nicks or indentions. Both of these things have kicked my but in the past. Had to dismantle a pops asa due to it leaking in October. It had a cat hair somehow get in it and created a leak past the seal. Same thing with one of my RTs. The nicks or indentions in new seals ive seen off and on over the years. Sadly new does not always mean good.

[athomas]

That sounds like a powertube oring issue. If it didn't leak before you changed that oring, then your powertube spacer is probably ok, so try a different oring there. You can confirm if it is a powertube issue or an on-off issue by holding the trigger in. If it shoots and then sputters when the trigger is held, then the problem is the on-off. If it shoots and then there is no sputtering when you hold the trigger in, then the problem is in the powertube.

[Evil1]

That sounds like a powertube oring issue. If it didn't leak before you changed that oring, then your powertube spacer is probably ok, so try a different oring there. You can confirm if it is a powertube issue or an on-off issue by holding the trigger in. If it shoots and then sputters when the trigger is held, then the problem is the on-off. If it shoots and then there is no sputtering when you hold the trigger in, then the problem is in the powertube.

This is also an issue I had years ago and it was the trigger rod.

[rawbutter]

This may sound really stupid. And I'm saying his because I ran in to this problem a year or so ago. Check the seals that could cause the leak for pet hair. Or very fine nicks or indentions. Both of these things have kicked my but in the past. Had to dismantle a pops asa due to it leaking in October. It had a cat hair somehow get in it and created a leak past the seal. Same thing with one of my RTs. The nicks or indentions in new seals ive seen off and on over the years. Sadly new does not always mean good.

I went through the on/off and changed the o-rings a second time, and that seemed to do the trick. It's working better now.

Although now it's shooting on pull AND release sometimes. I haven't decided yet if that's good or bad.

[ghost flanker]

That's bad. That means the sear is failing to catch the bolt when the on/off valve opens. The culprit could be one of these:

- The RT on/off you're using has a pin that is too short. Switch back to an AM/MM on/off that is known to be good.
- The sear is worn. Replace with one known to be good.
- The bolt is worn. Replace with one known to be good.
- The trigger rod is improperly set. Adjust trigger rod so that it is 1mm from the trigger at full-travel-forward while the gun is pressurized.