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PostPosted: Sun Jul 08, 2018 9:34 pm 
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Joined: Sun Jul 08, 2018 8:33 pm
Posts: 3
I have an old .177 pellet gun (bough from canadian tire way back when).
Image

I want to replace the piston seal, and the breech seal.
The originals were both leather. Is there an alternative to using leather again?

Regarding the breech seal, it's deeper at the top then at the bottom.
Image

Any of your advice is welcome. Thanks.


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PostPosted: Sun Jul 08, 2018 11:15 pm 
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Location: Edmonton
Welcome to the forum, phyrexianairgun.

Thanks for joining us; we look forward to your participation.
If you haven't already done so, please read and keep in mind the rules of this forum.
You'll find them here: https://www.airgunforum.ca/forums/forum34.html

Enjoy your membership.
Murray.


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PostPosted: Mon Jul 09, 2018 3:36 am 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 990
Location: Eastern Townships, P.Q.
phyrexianairgun wrote:
I have an old .177 pellet gun (bough from canadian tire way back when).
I want to replace the piston seal, and the breech seal.
The originals were both leather. Is there an alternative to using leather again?
Regarding the breech seal, it's deeper at the top then at the bottom.

Any of your advice is welcome. Thanks.


Funny you ask, I just did that this week-end. I made my own main seal, but with a little research you can get a replacement synthetic one, like this: https://www.airgunsource.ca/en/vortek-v ... eplac.html

You need to know your rifle's compression tube diameter to get the correct seal (most common sizes are 25, 26, 28 and 30 mm), and you may need to drill and thread a new hole in the piston head to install the new seal. As for the breech seal, I never saw a ''slanted'' replacement, so I made a wedge-shaped shim and used an O-ring, that you can get at your local hardware store or hydraulic/tractor shop.


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PostPosted: Mon Jul 09, 2018 7:20 am 
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Joined: Sun Jul 08, 2018 8:33 pm
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airmec wrote:
Funny you ask, I just did that this week-end. I made my own main seal, but with a little research you can get a replacement synthetic one, like this: https://www.airgunsource.ca/en/vortek-v ... eplac.html

You need to know your rifle's compression tube diameter to get the correct seal (most common sizes are 25, 26, 28 and 30 mm), and you may need to drill and thread a new hole in the piston head to install the new seal. As for the breech seal, I never saw a ''slanted'' replacement, so I made a wedge-shaped shim and used an O-ring, that you can get at your local hardware store or hydraulic/tractor shop.


Hi aircmec.
That's just what i was looking for. That shim looks like plastic, what did you use exactly?


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PostPosted: Mon Jul 09, 2018 5:26 pm 
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Joined: Thu May 07, 2015 8:30 pm
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Location: Eastern Townships, P.Q.
phyrexianairgun wrote:
airmec wrote:
Funny you ask, I just did that this week-end. I made my own main seal, but with a little research you can get a replacement synthetic one, like this: https://www.airgunsource.ca/en/vortek-v ... eplac.html

You need to know your rifle's compression tube diameter to get the correct seal (most common sizes are 25, 26, 28 and 30 mm), and you may need to drill and thread a new hole in the piston head to install the new seal. As for the breech seal, I never saw a ''slanted'' replacement, so I made a wedge-shaped shim and used an O-ring, that you can get at your local hardware store or hydraulic/tractor shop.


Hi aircmec.
That's just what i was looking for. That shim looks like plastic, what did you use exactly?


I used a plastic tube from an old faucet. I turned it to size on my mini-lathe, but it could easily be done with a drill and files or sandpaper. I found the correct angle of the breech with a protractor (in my case 8┬░) and filed the end of the tube to match, then cut it and sanded it smooth.

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PostPosted: Fri Jul 20, 2018 2:25 pm 
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Joined: Sun Jul 08, 2018 8:33 pm
Posts: 3
I notice this replacement seal flairs at the front.

https://www.airgunsource.ca/en/vortek-v ... eplac.html

Does anyone know if this will work for a piston tube with an inner diameter of 24 mm?


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PostPosted: Fri Jul 20, 2018 3:42 pm 
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Location: Eastern Townships, P.Q.
This seal is made for 25 mm tubes, so if you're absolutely sure your tube is 24 mm and you want to use it, you'll have to size it to the correct diameter. 1 mm = 0.039'', which is a bit more than 1/32''. You may be able to size the seal by chucking the threaded end in a drill and using sand paper, starting with #100 or #150, up to #400 or even #600. Back the sand paper with something hard and square like hardwood or steel stock to ensure you keep the surfaces straights. Try the seal often in the tube to feel the resistance, ideally you want around 2 to 2 1/2 lb of force to push the seal in the tube. HTH.

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