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TX200 breech seals etc... Advice please

Discussion in 'Anything Airgun Related' started by Padster, Sep 28, 2014.

  1. Padster

    Padster Engaging Member

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    Hi

    Any Tx200 users out there that have used anything other than standard AirArms Orings for breech seals to get a better breech seal lock up?

    Or advice on shimming the cocking shoe? Was thinking of a thin strip if aluminium sheet (ie recycled redbull can!!) shaped appropriately around the shoe to reduce the gap between shoe and chamber recess when in lock up position...

    Alternatively can anyone recommend a good place to get the TX serviced and tuned to get her back on form?

    Cheers
    Padster
     
  2. dave goodall

    dave goodall Donator

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    Tinbum for a cheap service if you fancy been extravagant vmach prob only needs the oring breech replacing tho
     
  3. Nickg

    Nickg Posting Addict

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    Shim under the breech seal, but remember you probably don't need it as when the gun is shot the comp tube moves forward under air pressure and seals against the breach seals.
     
  4. Dag

    Dag Pro Poster

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  5. Nickg

    Nickg Posting Addict

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    get them from Cromwell tools About £4 for 200
     
  6. Padster

    Padster Engaging Member

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    Thanks guys.

    I should really have mentioned the problem I'm having first.

    The TX used to put out bang on 11.2ftlb consistently and shoot really smooth (I have a Tinbum drop in kit fitted).

    I then fitted a 0.25mm PTFE piston sleeve, that didn't work, it stopped the gun from cocking,.. So I immediately removed the sleeve.... and since then power has been all over the place, down to 7.5, then next shot up at 10.7, absolutely no consistency.

    Yes yes I know I should have left it alone.. But I'm a man and "fettling" is one of the laws of nature.

    Basically I think the power fluctuations are down to poor lock up, and I can either sort this by a new/ shimmed shoe or larger breech seals..

    I have subsequently replaced the breech seals with OE parts (sorry dag, hadn't seen your ad by that point) the old ones were well past their best, but power is still all over the place... Hence wondering if there were any larger seals out there to try.

    The cocking shoe does have play, there is about a 1 or 2mm gap between the shoe and the back of the recess in the chamber, and the shoe can move about in it... But it was like this even when I had consistent power so I'm not sure if this is how it should be or should it be a snug fit?

    This evening I've ordered a new shoe and linkage pins so will see how this compares to the ones in there at the moment.

    Hopefully this will sort it

    Cheers all
     
  7. RED1 TOM

    RED1 TOM Well-Known Member

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    The sleeve would have made the spring bind onto the piston, so check out the two bearings on the outside of the piston, as they could have been damaged due to the extra force. I suppose that you have checked out the piston seal as this to could have been damaged due to extra force.
     
  8. Dag

    Dag Pro Poster

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    There's them that fettles and them that leave it be. As it says in the good book " If it ain't broke don't fix it " see The Book of Dag Ch.12 v.1 ;)
     
  9. Padster

    Padster Engaging Member

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    Cheers Red

    As soon as I met with resistance on cocking with the sleeve in I stopped. I didn't force anything. The sleeve wasn't damaged or deformed when I took it out so I can't imagine it damaging the piston or the bearings, though I have examined the whole set up carefully and nothing seems out of sorts other than the cocking shoe slack.

    I have checked the piston seal and bought a new one to replace if needed.. Was going to do one thing at a time and see the result.. New Breech seals haven't worked!! Next stop cocking shoe and pins...

    Oh and I received "bad" readings on the Combro ... First time I've had that.
     
  10. cloverleaf

    cloverleaf Honorary Member

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    I can't offer any definitive fix; other than to say that this issue is definitely the TX200's Achille's heel (sadly afflicting what's arguably otherwise one of the best sporting springers available).

    Here's a link to some stuff I wrote on it a while ago; ultimately the conclusion I came to is that the lockup issue is a design flaw that's not particularly easily overcome..
     
  11. RichieRich

    RichieRich Ping!

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    Apparently, the HW77/97 breech seal will fit as an alternative, although i have never tried it as they are £8 a piece
     
  12. render87

    render87 Busy Member

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    if i was you mate i would chrono another gun or replace the battery's in the combro just to rule that out atb
     
  13. RED1 TOM

    RED1 TOM Well-Known Member

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    Hi Cloverleaf,

    That article certainly helps to understand what is going on during the lock up process, my current TX is a 2005 MK III, I have had no problems with lock up, but will certainly remove the indent and have a check for the pressure.

    It does look like lock up issues are the cause of Padsters problems though, ones again this forum members owe you a beer mate !!

    Tom
     
  14. Padster

    Padster Engaging Member

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    So... An update, in order of changes.

    New batteries for Combro, no difference, so it's not that causing odd readings.

    New cocking shoe, is identical to the old one as far as I can make out... Fitted and makes no difference.

    Checked cocking linkage pins, no issues.

    New piston seal, easy change over, similar seal if not a little stronger... No change initially but am going to put 50 pellets through it to bed the seal in.

    The new breech seals don't appear to have any marks on them where I would expect it to press upon the breech itself.

    Next stop is to fabricate breech seal shims from 0.25mm PTFE and try incremental layers between the two seals and see if increasing the depth helps any.

    Hmmmmm.

    Out of interest, what are the symptoms of a spring that is past it's best??
     
  15. Akita177

    Akita177 The Absolute State of Britian podcast

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    Loss of power would be one, have you inspected the piston seal it may have got damaged at some point.
     
  16. dave goodall

    dave goodall Donator

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    I ave a green piston seal very much like the vmac one but cantonfirm its vmach if any use
     
  17. Padster

    Padster Engaging Member

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    Akita & dave

    thanks both, I replaced piston seal with a brand new Air Arms seal last night, will let it settle in and see how it goes, but so far it's still erratic on power.
     
  18. Padster

    Padster Engaging Member

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    Finally sorted my power variation issues... I made a few shims out of PTFE sheeting to fit between the two breach seals, 0.25mm and 1mm shims.

    [​IMG]

    A simple hole punch makes a hole pretty much spot on then just cut around it in a similar width to the seal. Then light grade wet & dry to shape it and smooth it.... Job done.

    Popped a 1mm shim in and tested it on the Combro ... 11.2 ftpd first shot which was what it was putting out before everything went pear shaped...

    10 pellets later and all in a range of 11.2 to 11.3.

    Happy days.
     
    Tinbum and foxtrott like this.
  19. foxtrott

    foxtrott I'll be back

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    Dose the tx have two breech on top of each other
     
  20. Brother Caleb

    Brother Caleb You have been judged and found unworthy!

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    Yes
     
    foxtrott likes this.

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