Tuesday, October 19, 2010

Benjamin 3030 Reassembly, Part 1

Putting it back together…for now…

10131001

Drilling the exhaust seal.

10131002

Turning the OD.

10131003

Facing.

10131004

Boring for the screw.

10131005

Cut off, next to old seal.

10131006

Not too happy with the face.

10131007

Inserted a new o-ring in the valve body.

10131008

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

10131009

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.

10131010

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

10131011

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.

10131012

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

10131013

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.

10131014

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

10131015

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

10131016

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.

0 comments:

Post a Comment