Tuesday, October 19, 2010

Benjamin 3030 Reassembly, Part 1

Putting it back together…for now…

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Drilling the exhaust seal.

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Turning the OD.

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Facing.

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Boring for the screw.

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Cut off, next to old seal.

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Not too happy with the face.

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Inserted a new o-ring in the valve body.

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Reassembling, used a spent CO2 cart to push the innards in.

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All together. It works…but not well. The valve is staying open far too long, leading to that dreaded “braaap” sound and only yielding 10 shots per cartridge.

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I forgot the screen,maybe that’s the problem? Nope. Didn’t change how it behaved when I replaced it.

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The barrel comes back pretty far to knock open the valve. Perhaps I’ll try a shim between the hammer and valve and see if reducing that depth helps.

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Also the valve seat is worn, probably a good idea to clean it up.

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The holes the piercing pin makes in the cartridges is pretty large, I think reducing the hammer strike will also limit that hole, which could be good or may not matter. It’s possible the pin is sticking in the cartridge as well.

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The main spring has a rough end. Maybe it’s a replacement?

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I substituted a shorter spring. It behaved exactly the same. So at least I know it isn’t that?

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I’m wondering if an even shorter spring would be good as that’s how much preload there is – the bolt hole still isn’t visible in the slot. But I think that the valve face could be the culprit. We’ll see.

1 comment:

Anonymous said...

Gee I had a 3030 back in the early 60's got it for Christmas. I remember that it would only work with "Jet King" CO2 Cartages. The BB's did not want to stay in the loading hole if it was shook much and if I remember correct it would do 25 shots easy. Get her going again neat old Rifle.