How to repair emag regulator valve pin assembly?

[athomas]

So I have to have polyurethane o rings for this?

Yes.

[halB]

I got frustrated. Took everything apart, washed it, scrubbed it all with a paper towel. Rinsed, dried. Put butyl on the valve pin assembly.

It works. I have no idea why, but it works. At least I think it does, the tank was down to about 600 psi, so I only got a cycle or two out of it. But it doesn't leak air out of the hole!

Also, there's a problem with the oring sizes on mcarter brown. The reg seat has two different sizes, 008 towards the front, 006 towards the back of the marker.

[Justus]

Also, there's a problem with the oring sizes on mcarter brown. The reg seat has two different sizes, 008 towards the front, 006 towards the back of the marker.

I know what you mean, it's easy to get confused, but the list is correct. When I posted those, the 006 is listed as a "reg valve pin o-ring" since that's what it seals against on the inside. It's listed as part #779 by AGD, as shown in the ReTro exploded view .pdf on the AGD site. The description is "Four of these desogrin o-rings are used in the Retro Valve, two as part of the regulator valve pin assembly, one on the On/Off pin, and one in the face of the regulator body." The 008 is the actual reg seat o-ring, and seals against the brass reg seat holder.

Here's the link to the ReTro exploded view: http://www.airgundesignsusa.com/down...oexploded1.pdf

[athomas]

The orings are probably firmly in place which is why it is working. The act of taking them out, cleaning, and then putting them back washed off any dirt that might have been hindering the seal plus you probably have gotten a better fit this time around. They might keep working for you until you get some urethane orings as long as they don't get stretched and pushed out of position.