I have a Diana Model 34 that is need of a new breech seal, I have heard to sand some material off the O.D or take some off the back of the seal, which way is best and how far should the new seal protrude from the the breech face ?
Diana Fitting a breech seal
- Thread starter Steelju
- Start date
I hear tell you could remove the seal then close/lockup the breech the use feeler gauge in the gap between the tube and breech block to get the gap then fit the breech seal accordingly.
I think you can Google that up somewhere around.
I think you can Google that up somewhere around.
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Thanks everyone, I have read so many different ways of replacing breech seals was not sure what would be the best way.
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I guess it's a take off if too tall or shim up if not .
Here's a blog I guess you already found it by now
https://www.pyramydair.com/blog/2008/04/shimming-a-diana-breech-seal/
I guess the oring is a 8x2.5mm s70? If you can find 8.5x 3 may save shimming .
Also you may try flyingdragon and ask Mike if he has the orings and shims on the ready to sell and ship . Maybe sold in a 5 pack ??
Here's a blog I guess you already found it by now
https://www.pyramydair.com/blog/2008/04/shimming-a-diana-breech-seal/
I guess the oring is a 8x2.5mm s70? If you can find 8.5x 3 may save shimming .
Also you may try flyingdragon and ask Mike if he has the orings and shims on the ready to sell and ship . Maybe sold in a 5 pack ??
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I forgot
http://flyingdragonairrifles.org/blog/?page_id=180
Pop Mike a email on the orings and shims .
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Some have shim washers under the seal. Some don't. Pull the seal and determine if there is anything under it before you put the new one in.
I like them standing proud of the pivot block a lot. They flatten out fast and as long as you aren't pinching the edges of the seal when you close the barrel you are good.
If it sticks up too far stretch it (a little) over a wood dowel and use a sanding block to work material off the back side. If it sits low shim it up.
I use a drop of UV doming resin on the back of a seal to make shims. Just lay the resin on the rear surface of the seal and flash the light. You have a perfect shim washer. You can make them any thickness you want and it takes 10 seconds to do it. Perfect shim washers every time without having to punch out concentric circles or wrap dental floss.
I like them standing proud of the pivot block a lot. They flatten out fast and as long as you aren't pinching the edges of the seal when you close the barrel you are good.
If it sticks up too far stretch it (a little) over a wood dowel and use a sanding block to work material off the back side. If it sits low shim it up.
I use a drop of UV doming resin on the back of a seal to make shims. Just lay the resin on the rear surface of the seal and flash the light. You have a perfect shim washer. You can make them any thickness you want and it takes 10 seconds to do it. Perfect shim washers every time without having to punch out concentric circles or wrap dental floss.
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