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BSA Cadet - breech seal

Discussion in 'Vintage collectable airguns' started by Johnc61, Sep 28, 2017.

  1. DClaw

    DClaw Engaging Member

    Messages:
    154
    Likes Received:
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    Location:
    Weymouth

    Hi John,

    If you pm me your address I'll pop a couple seals in the post for you - leather and polyurethane...I also have some ptfe 8x12mm tube on order to play around with but it is not here yet...
     
  2. johnakay

    johnakay Engaging Member

    Messages:
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    34
    Location:
    stockton on tees
    I bought the rubber tubing as mention above.
    the leather ones are a pig to get in.
    I just fitted one in and straight away it broke out once I started to use the rifle.
    the leather 'o' ring is old probably about 25 years more old.
    I have another but dammed if I'm gonna mess about fitting that one.
     
  3. Johnc61

    Johnc61 Donator

    Messages:
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    Location:
    Fareham, Hampshire
    My leather seal o ring was not too difficult to fit, easy to cut back with sharp knife, soaked in oil and then started to break up in shreds every barrel close. To test it, extra oil put in breech face which then sprayed out in the join. Piece of plastic put in and thumb over join pushed the fps up on the chrono, so it proved the breech seal was failing.

    Still, the increase after fitting a new piston washer, clean up and regrease of spring etc. proves it's still good to use. Not bad from 1946!
     
  4. johnakay

    johnakay Engaging Member

    Messages:
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    Location:
    stockton on tees
    then started to break up in shreds every barrel close.

    that is exactly what happened to mine.
    its always the top part that shreds out...so hopefully this rubber tubing should cure it.
    1 mtr is going to last a few years.
     
  5. DClaw

    DClaw Engaging Member

    Messages:
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    47
    Location:
    Weymouth
    Re. leather breech seal...it is quite a small piece of leather, bound to fray especially near the top where the angle of the breech tends to bend it over the lip of the recess...perhaps you can use something to help stabilise it and bind the fibres and still give a good seal, wax for instance?...or I dare say a dip in a 50/50 solution of pva and luke warm water and left to dry could possibly help bind the fibres of tired old leather breech seal? :D

    Re. the polyurethane tube - easiest to fit with barrel removed, make sure that the end of the tube is cut square, push it into the recess and cut it with about a 1mm or so protruding from the breech face you need to use a very sharp knife in one clean push, try to avoid a sawing motion in the cut if possible but it will sand back with 120/150 grit emery cloth if need be.
     
    Last edited: Oct 5, 2017
  6. Johnc61

    Johnc61 Donator

    Messages:
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    Location:
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    My thanks to Dave for that breech seal. It worked (leather) and back at 5ft lb output now which may go up after a lot of pellets through. Finally all working well, now accurate as well. Great :D
     
  7. johnakay

    johnakay Engaging Member

    Messages:
    153
    Likes Received:
    34
    Location:
    stockton on tees
    tried to fit the other spare seal but broke up even after soaking in neatsfoot oil.
    the washer is about 18/20 years old so probably that's why both of the broke up.
    it was so dry and hard.
    got the plastic(not rubber)tubing cut that to size one in the hole.
    it seem unaffected by heat.
    would've of thought that rubber would of been better.
    I've no way of telling if its good or not.
    anyway all done now.
     

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