Air Arms TX200 splits breach seals

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extradrygin2001

extradrygin2001

Member
Apr 13, 2020
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WI, United States
Hello and good morning.

A friend of mine has a TX200 that splits the top breach seal. He has replaced the compression tube thinking there may be a bur cutting the seal but it did not take care of the problem.

I will ask him for a picture, but it basically is cutting the seal around the top edge and then the seal flowers out around the barrel breach.

Any ideas or suggestions are greatly appreciated.
 
Here are the pics

IMG_7277.jpeg


IMG_7269.jpeg
 
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Two solutions. One, is to remove a bit of material from the transfer port side of the barrel. The other, and better solution is to shim the barrel nut out ti meet the compression tube as the seals make contact with the transfer port. you'll also want to tighten up the cocking shoe slot by either peening it in, or gluing shims to keep the shoe from moving. Good Luck!
 
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humbled.ag said:
Two solutions. One, is to remove a bit of material from the transfer port side of the barrel. The other, and better solution is to shim the barrel nut out ti meet the compression tube as the seals make contact with the transfer port. you'll also want to tighten up the cocking shoe slot by either peening it in, or gluing shims to keep the shoe from moving. Good Luck!
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Is is possible that these breech seals are being damaged when they're being inserted? I know that when I've replaced those in my TX200, it's really hard to get both of them in and lying flat without damage. TXs are mostly simple to work on, but these breech seals are their weak point. Keep some on hand and keep them oil free. Ahhh, the joys of our hobby. Orv.
 
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Orv said:
Is is possible that these breech seals are being damaged when they're being inserted? I know that when I've replaced those in my TX200, it's really hard to get both of them in and lying flat without damage. TXs are mostly simple to work on, but these breech seals are their weak point. Keep some on hand and keep them oil free. Ahhh, the joys of our hobby. Orv.
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I use a small(maybe5 or 6mm) socket to press the orings in with even pressure. I may be wrong on the size, but the technique is sound.
 
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drpietrzak said:
I am following but don't have any ideas beyond what has been offered.
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Those two breech seals can be real difficult to get into place without damaging them. Placing them exactly in their small space or scoring the breech valve should you be using metal tweezers or the like has been a challenge for me. I really like the thought of using a socket to place them - I'll definitely try this next time. Thanks for the idea. Orv.
 
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One more thought comes to mind.
There is always a bit of moisture expelled from the chamber every time the rifle is fired.
(The air is heated to over 2000F degrees after all.)
This moist could very well be staying around on the breech and breech o-rings after the shooting session is complete.
Then the moisture dries with o-rings and breech in contact with each other thus making the two items stick to each other and maybe tearing the o-rings up a bit the next time the rifle is cocked.
How to combat this?
Do as I do…Leave the cocking arms out of battery while the moisture dries.
Too, it might allow your o-rings to last a bit longer:

IMG_2763.jpeg
 
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Frank in Fairfield said:
One more thought comes to mind.
There is always a bit of moisture expelled from the chamber every time the rifle is fired.
(The air is heated to over 2000F degrees after all.)
This moist could very well be staying around on the breech and breech o-rings after the shooting session is complete.
Then the moisture dries with o-rings and breech in contact with each other thus making the two items stick to each other and maybe tearing the o-rings up a bit the next time the rifle is cocked.
How to combat this?
Do as I do…Leave the cocking arms out of battery while the moisture dries.
Too, it might allow your o-rings to last a bit longer:

View attachment 556695
Click to expand...
 
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these Orings are just BS108 size and the material could be anything you choice
they are said to be 70 dura which is on the soft side part number tx221
now you could make your own out of tubing if you could find the right size and that might be hard needing a 11.26mm OD 7/16 is easy to find but it is only 11.11mm
or you could use a urethane on top and a buna on the bottom, the urethane would take the abuse and the buna would give the compression
 
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