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Old 01-13-2010, 08:11 PM   #1 (permalink)
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Blast! Micromag Problem

Just got my first mag, a gen2 micromag, last weekend used locally.

Seemed to work fine when I bought it from the guy.

I ripped it apart to clean the internals (bone dry, and lots of caked paint on the inside). And I put it all together again. And now, after I air it up (sear pin becomes stiff against the trigger), and pull the trigger it behaves weird. When I pull the trigger, it sometimes shoots like 3 times, without resetting the sear all the way. I can't shoot once without it shooting a couple more times. And then if I back out the velocity adjuster, and fire, it looses all pressure in the marker.

Did I put the sear pin too close to the trigger? It's more than the width of a credit card.

Did I lubricate the wrong parts?

Perhaps the sear was worn? It looked ok when I pulled it out.

Or did I put something in backwards? First time having a mag apart, it's possible I did. I didn't take apart the valve too much. I unscrewed the velocity adjuster part until it fell out (there was a shim type thing behind it, which way was that supposed to go in?), and took the 2 halves of the valve apart to see inside.

I can provide pics if needed. Help!
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Old 01-13-2010, 08:28 PM   #2 (permalink)
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Best way to lubricate is to put a few drops of oil in the asa and shoot them through, if you do that and you still have problems it's probably not a lubrication issue.

Did you take out or even touch the reg seat? They can cause all sorts of odd problems if they're dirty or not in properly.

You're not getting any leaks, right? How are your chrono speeds?
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Old 01-13-2010, 08:34 PM   #3 (permalink)
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Hm ok, when I took it apart I manually lubed everything. Perhaps parts that are supposed to be dry? I felt that was the best way, since there was some grime I had to clean off of the bolt and such.

Which part is the reg seat? (again mag noob)

If I back out the velocity adjuster screw at the back of the valve it'll eventually leak down the barrel, but I assume that's because I backed the part out too far.

Can't comment on chrono speed just yet.
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Old 01-13-2010, 08:37 PM   #4 (permalink)
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The reg seat is the thick washer looking thing that's stuck in the reg half of the valve when you split the two halves.

Have you watched the Tom Kaye video yet?
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Old 01-13-2010, 08:37 PM   #5 (permalink)
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You may have your valve pin upside down.
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Old 01-13-2010, 08:41 PM   #6 (permalink)
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Quote:
Originally Posted by Bob T Guy View Post
Did you take out or even touch the reg seat? They can cause all sorts of odd problems if they're dirty or not in properly.
Or if you opened the halves one too many times. I had to replace a regulator seat because I took them apart twice and the imprints on the sealing face were not forgiving.
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Old 01-13-2010, 08:41 PM   #7 (permalink)
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I didn't actually take apart the inner half of the valve, so I didn't take out the valve pin (Long skinny pin right?). The reg seat I put back around the pin. However I did take a small spring out of the power tube, which I put back in.

Do you have a link for the Tom Kaye video? I have not watched it.
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Old 01-13-2010, 08:42 PM   #8 (permalink)
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Or if you opened the halves one too many times. I had to replace a regulator seat because I took them apart twice and the imprints on the sealing face were not forgiving.
The reg seat did have an imprint on them... perhaps that could be the problem?
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Old 01-13-2010, 08:43 PM   #9 (permalink)
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Automags.Org Online Forums - reg seat good vs. bad

The imprint is fine, that is how it seals. There is a picture 1/3 the way down that explains the problem with opening/closing the regulator more than you need to.

EDIT: Usually a bad regulator seat just makes things leak, but you never know...
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Old 01-13-2010, 08:44 PM   #10 (permalink)
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Originally Posted by Ivan View Post
I didn't actually take apart the inner half of the valve, so I didn't take out the valve pin (Long skinny pin right?). The reg seat I put back around the pin.

Do you have a link for the Tom Kaye video? I have not watched it.
http://www.youtube.com/watch?v=vehPc7vuK20

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