TX 200 Breech seal

[T 20]

The TX normally takes two identical O rings as the breech seal, Mike.





All the best Mick

[Vernal]

The TX normally takes two identical O rings as the breech seal, Mike.
All the best Mick

Thanks Mick, I have got some identical O rings, but I also have a Chambers replacement seal, which is a nylon "double O ring in one" , and I thought I would try that as I am still not getting full power from the TX. The Chambers one seems to have different thickness ends.
All the best to you too,
Michael

[Phil Russell]

I have not seen the double version but it sounds interesting. Otherwise, as above, BS108. These also do the 'buffers' on the TX200SR.
Cheers, Phil

[Phil Russell]

Thanks Mick, I have got some identical O rings, but I also have a Chambers replacement seal, which is a nylon "double O ring in one" , and I thought I would try that as I am still not getting full power from the TX. The Chambers one seems to have different thickness ends.
All the best to you too,
Michael

I looked at the Cahambers site and could not find the 'double ring' seal you mention.
Can you tell me where on the site it is, please?
Cheers, Phil

[Vernal]

I looked at the Cahambers site and could not find the 'double ring' seal you mention.
Can you tell me where on the site it is, please?
Cheers, Phil

Now I am starting to worry! At least I start comforted by having two of the double seals, and the packet they came in bearing the inscription PW080 2X2 in front of me. I have taken a picture of them, but I can't seem to be able to post it (I could email it to you). I also have a clear recollection of seeing what is obviously one double washer on a parts diagram, and I have only bought TX spares from Chambers, but I do not seem to be able to find them on the current Chambers parts pic. I also checked the John Knibbs site just in case, but that too shows two separate washers. I would put it down to my advanced years if it were not for the physical evidence. As it is, it is a mystery.

[Phil Russell]

Now I am starting to worry! At least I start comforted by having two of the double seals, and the packet they came in bearing the inscription PW080 2X2 in front of me. I have taken a picture of them, but I can't seem to be able to post it (I could email it to you). I also have a clear recollection of seeing what is obviously one double washer on a parts diagram, and I have only bought TX spares from Chambers, but I do not seem to be able to find them on the current Chambers parts pic. I also checked the John Knibbs site just in case, but that too shows two separate washers. I would put it down to my advanced years if it were not for the physical evidence. As it is, it is a mystery.

Yes, mystery. I note the piston seal is PW030 on Chambers, the PW presumably meaning piston washer.

I will PM my email to you if that is OK as I am intrigued by the mystery .. not that I need a seal as I have some single O rings.
Cheers, Phil

[Vernal]

E mail on its way Phil. I have, for now, fitted the standard two O rings, but even with a massive (?) 52mm preload my short stroked TX is only just making 11 with JSB Express

[Phil Russell]

E mail on its way Phil. I have, for now, fitted the standard two O rings, but even with a massive (?) 52mm preload my short stroked TX is only just making 11 with JSB Express

Interesting. Now this may be a total red herring but I had a Mk1 TX (although I doubt the MK is relevant) that was running around 9. No matter what I did, new spring, new breech seals, new piston seal, increasing pre-load ... anything, I could not get it to increase.
Then I resealed the end plug on the compression tube. Perfect ... full power resumed, and adjustable. The O ring is 1.6mm x 22.1 but the thread needs more sealing support from the likes of a suitable Loctite. I have heard of the PTFE plumber's tape being used.

More on the double breech seal: further investigation, going back to 2018 suggests a chap called Bigtoe used to make them. That's all I know.

Cheers, Phil