Tuesday, November 8, 2011

Healthways Plainsman BB Pistol Disassembly, Part 3

Almost done…

11041141 
The barrel end of the feed mechanism.

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The BB hopper side of the feed mechanism.

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The valve assembly is just pushed into the CO2 tube.
The cartridge is pierced and fills this chamber with gas. The o-ring was hard, it’s amazing that it was holding gas at all.

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A snap ring holds the exhaust valve in the body.

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Ok, a snap ring and a spring star washer holds the exhaust valve in the body.

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I had to gently lever out the spring washer. The disk with the 4 holes allows the gas to flow.

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Valve assembly.

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For some reason the stem has a ground bevel on the end. Since there’s nothing to hold it in a particular orientation (unless it’s carefully aligned at the factory and then stays put?) I don’t see why.
I’m assuming that the rim of the seal holds the valve seal in?

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I can’t tell if the stem is soldered, screwed or pressed in. No hint from the spring end. This is odd as the rest of the pistol is so repairable. But making a new valve stem would be easy I suppose. The pin diameter is the same as the Crosman guns from the era, but the seal is more like a Benjamin or Sheridan. I'll reuse it and if it leaks then I'll worry about making a replacement.
   
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A standard sealing lip inside.

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The cutouts in the valve body allow gas to flow around the end of the CO2 cartridge and into the valve.

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The piercing assembly. Clip was levered out with a stout dental pick.

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The piercing pin was pushed out from the other side (I opened the lever and wedged the pick up and into the hole.

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An o-ring seals the pin.

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It fits in this cup that looks to be staked in place. Yes, I put those two scratches at 12:00 on it. Oh well. It doesn’t matter.

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I decided not to punch the lever pin out. those three notches means that it’s a press fit and has cut into the hole material. Better to leave it and not risk loosening the pin. The o-ring around the body (on the left) was hard as a rock.

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A setscrew underneath the muzzle end of the frame.

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Removed and a bushing for the barrel slips out.
So overall this was a unique design. I love design from this die cast era. Compared to the Roger or other die cast pistols, this has superior quality.

I’ll need to get some more 8 gram cartridges (I used up all I had with the Benjamin 30/30 debacle) to test after I get it back together.

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