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Hello All and some advice sought

JocktheJake
(@jockthejake)
Member

I very recently fell heir to 3 vintage air rifles, one of which is a Gem. The seriel Number, which is a bit faded, is 81413 and the rifle is not yet a shooter, though I have hopes. I've got it disassembled to its component parts and cleaned the accumulated oil, grease and dirt from the bits. However, I'm stumped by the piston and it's sealing washer. I've seen pistons with "O" rings, made from leather and held in place with countersunk screws and even pistons with Piston rings but this Gem doesn't seem to have any of the above.

So, how's the blessed thing held in place? Any help will be most gratefully received.

Thanks.

John.

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Topic starter Posted : 29th June 2022 14:14
Garvin
(@garvin)
Curator in Chief Admin

@jockthejake 

I think some of the Gem pattern rifles had no piston seal at all.

See:

http://www.airgunbbs.com/showthread.php?852485-The-Gem-piston-washer

 
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Posted : 29th June 2022 15:18
JocktheJake
(@jockthejake)
Member

Hi there.

Thanks for the reply and the link to the airgunbbs.com thread. It all made for very interesting reading. My own Gem had the leather piston washer disconnected from the piston, wedged at the bottom of the cylinder. I think it was probably atteched to the piston at one time by I think, some sort of pin/bolt and washer. I noted that someone had drilled and tapped a new hole in the piston for a new retaining bolt, and this is what I intend to do as well.

I've made a new piston washer from a double thickness of 4mm leather which I hope will seal the cylinder and produce enough thrust to get the pellet out the barrel. Hopefully, hopefully!

Thanks again for the reply.

Yours.

John.

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Topic starter Posted : 28th August 2022 22:35