Just got this: what do I have?

[Chikahiro]

Yeah, those orings are pretty bad. It definately wasn't going to hold air.

The automag manual is here: Automag manual

The automag exploded view is here: Automag valve exploded view

The spacer is inside the powertube. When you unscrew the brass tip from the front of the valve, you will remove it first followed by the powertube oring.

Thanks. The exploded view helped more than the manual. Whatever I got is old enough that there are differences. Must've got a real old one :)

Have you watched the YouTube videos where Tom Kaye explains in detail (7 videos worth) how to tear down and tech Automags? If not, you really need to watch them.

I completely forgot about those! I'll watch'em, thank you :)

Given the state of your orings, make sure you change every one of them to start.

Your velocity adjustment parts, which are your piston and spring pack, are probably fine. They generally don't go bad, especially if they haven't had tons of use. The small end of the spring pack goes inside the adjuster cap, opposite from the orientation shown in your picture.

A leak out the back is usually due to a leaking regulator seat oring. Check that it is seated in place and that there isn't a piece of dirt on it.

All o-rings changed. So, either I've done something wrong (entirely possible), or missed something.

So, before I go (much) further - would it be better to keep working on this til it works? Or start looking to replace larger parts of the systems? Tunaman noted the trigger frame is worn, for instance.

Looks like I need to get spacers, though? Hrm...

[Chikahiro]

Actually, given I'm likely to screw things up... can anyone help me make a parts list with TunaMart? Do I need to disassemble the whole thing first to help see? I figure I'd better order more o-rings, just in case...

[athomas]

Thanks. The exploded view helped more than the manual. Whatever I got is old enough that there are differences. Must've got a real old one :)

The only real differences should be the on-off top and the powertube spacers.

Yours should have an on-off top with a X cut in the under side. The X side sits on the larger bottom section. The new ones are a universal fit, so it doesn't matter which way is up. The old ones work fine.

Your powertube probably has a spring instead of a spacer. The spacers allow you to tune your oring placement, so that you can compensate for tolerance differences in your setup and also compensate for your sear wearing.

[Chikahiro]

Does the disk on the spring assembly need to be flat and flush?

[athomas]

The disk on the spring pack will find its natural flat and flush location when it contacts the back end of the piston assembly.

[Chikahiro]

More photos on the state of things...

http://1drv.ms/1zRsl0m

I've run out of air, so no more testing right now.

Also, the videos from the sticky are gone? Deleted? Did they move?

[athomas]

It seems you have an 8-hole mod on the back half of your valve. Those were done to alot of the early mags to solve the recharge issue due to the single hole not lining up with the one in the front half. The only hole that actually needed to be drilled was the one that lined up with the hole in the front section.

Your on-off top section is an aftermarket part, which is why it looked different than the one in the manual. It should be fine though.

The videos on the you-tube channel must have gotten moved and the links aren't updated.

[Chikahiro]

Ah, so I'm not running stock. That might be part of why I'm getting confused (don't take much ).

[Chikahiro]

Is this the famous video 7?

https://youtu.be/7C_1nufgDmU

Super useful! Thank you for getting me to look :)

[Chikahiro]

Okay, right now I'm wondering how long a braided steel hose I'd need to go from the back of the velocity adjustment tube to the vertical ASA. It measures 6", and I figure I'll need more just to get it out properly? How do you deal with the extra hose?

[athomas]

I used to run mine so that it looped just over the lower end of the powerfeed tube. That way you could have access to the powerfeed plug and the loop allows more line flexibility for disconnecting or working on the valve. In that location, it stays out of the way and looks good. The actual length will be determined by your fittings, but the loop also gives you some flexibility on the length so that it doesn't need to be exact.

[Chikahiro]

Maybe a silly question: I realized that marker had an expansion chamber for CO2. My eNMEy has a handle/regulator. I think my Spyders have regulators as well. I think the Automag has one built in - right? Watched a TechPB noting markers can have between 2-3 regulators, each one progressively.lowering pressure?

Is that something I need to think about? Or am.i fine to just plug in my remote line to the vertical ASA?

[b-cuzz]

If you have the velocity set too high, the regulator will vent out the back also. If that's the case, then that's part of the normal function of the Mag. Overpressure relief.

[Chikahiro]

If you have the velocity set too high, the regulator will vent out the back also. If that's the case, then that's part of the normal function of the Mag. Overpressure relief.

While I appreciate the technical response, I'm not sure I know how to parse that: I think it means "you're fine with the stock internals of the Automag," but I'm not sure.

[b-cuzz]

Nah, just that a leak out of the back doesn't necessarily mean you have a bad o-ring. These things are built with an internal over-pressure relief that vents the excess out when it's set too high. I picked up a Micromag that had sat in a dude's closet for like 2 years, and I took it home, oiled it, and gassed it up. It leaked out of the velocity adjuster hole, so I degassed it, backed it out a few turns, aired it back up, and it was fine. The silly thing still hasn't had a new o-ring in it since I bought it.