Uncontrollable RT effect w/ X-Valve

[JonM]

I’ve tried installing the valve with both a CF single trigger frame and with a Nummech double trigger frame. The on/off is a standard RT on/off with the standard length pin. No matter how hard I try to get a single shot out of it, I can’t. This makes the marker completely full auto and therefore not field legal. What would I need to check to get this thing under control? Until I get it sorted, I had to put the Classic valve into my primary Mag.

[superman]

Does it have all of the orings in the on/off?
can you measure the pin length?

[JonM]

The pin measures 0.744”. I’ve verified that all four o-rings are present.

[superman]

What about the orings on the reg pin/reg seat?

[JonM]

Present and accounted for. From what I can see, the seals appear to be in good condition, although I expect they could be deceptive given the tight tolerances involved. I believe I can see where your train of thought may be headed. Would I be correct to assume that a rebuild kit may be in order?

[superman]

Potentially. I would also check the sear edge that grabs the bolt.

[JonM]

I’ve actually tried two different sears by swapping the valve between markers. The edges are both in great shape.

[William the Third]

Edit: This information is incorrect, check post #7 and #8 for more details.

With no air on the marker, hold the trigger back and air it up. Does it full-auto fire as soon as it's aired up? If so replace these two o-rings. if that doesn't work, the look at the on/off. Last time I ran into this though, it was these two o-rings allowing air to bypass the on/off and flow directly into the dump chamber.

[JonM]

Thanks for the tip. I’ll give it a go and report back. I think I may have 008 o-rings in my kit.

[nak81783]

I want to say those are 006s.

[JonM]

I believe you’re right. I pulled the pin out and this is what I saw. I thought I had seals in my kit, but apparently not. I’ll need to spring for the rebuild kit after all.

[LukeAO]

It looks like you installed an oring in the back or your reg seat, it doesn't go there it goes in the nose of the reg housing

[JonM]

Interesting. That’s how it came from the previous owner.

[JonM]

Mystery solved! Thanks, guys. Moving that o-ring did the trick. I still went ahead and ordered a rebuild kit just in case (I’ll need it eventually anyway). At least the marker is controllable again.

[LukeAO]

That wouldn't be the reason for the uncontrollable RT

[JonM]

That’s odd. I wonder why it’s firing single shots again then. Well, I suppose a deep dive is in order. Perhaps my troubleshooting inadvertently fixed the problem for now.

[LukeAO]

That’s odd. I wonder why it’s firing single shots again then. Well, I suppose a deep dive is in order. Perhaps my troubleshooting inadvertently fixed the problem for now.

Hard to say what happened, to be honest I wasn't really following the thread all that close, I just noticed the oring in the the back of the reg seat.

[JonM]

Yeah, I’m guessing that reseating the regulator pin assembly is what did the trick. I can tell it’s still not 100% right, but it’s a start. Given the laundry list of quirks I’m finding with it, I’m going to do a complete tear down and rebuild once the kit arrives. Probably best to leave no stone unturned.

[JonM]

Just as an update, a rebuild kit was the right call. I did a complete tear down of every component, replaced every seal, and tuned the Level 10 kit. The marker is now shooting like new.