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Leather piston seal

Discussion in 'Vintage collectable airguns' started by valboskie, Feb 17, 2014.

  1. valboskie

    valboskie Busy Member

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    hi there this is some pictures of my webley falcon leather piston seal ,
    is this usable can i rejuvenate it in any way .
    i cant get the screw holding it on to budge the screw head has started to tear up a bit with me trying to force it to move .
    i tried some wd40 on the screw to help loosen things up a bit but no joy,
    i ordered a new spring as the original is bent and a new leather breech seal
    any help or advice on what to do with the piston seal would be appreciated
    atb
    David
     

    Attached Files:

  2. JD

    JD Donator

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    First thing you need to do, is find or make a screw driver that fits the slot in the screw perfect, give the screw a good few taps, then see if it will move, if not,

    heat up a piece of rod, nice cherry red will do, then place it on top of just the screw head, do it a few times, to get a good heat transfer, and try again to loosen it.

    Find some rubber to wrap around the piston body and vice it, without crushing or putting it out of shape.
     
  3. BJacobs571

    BJacobs571 Engaging Member

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    Piston seal looks OK to me. Soak it in oil and put it back in. The oil will make it more flexible and make it expand a bit.
     
  4. valboskie

    valboskie Busy Member

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    what type of oil would i soak it in
    atb
    David
     
  5. oliver13

    oliver13 Donator

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    With being on the end of a piston that screw is probably more like a rivet now, do what JD says.

    Get some big, cheap, Chinese screwdriver & grind the end shorter until it is definitely oversize, then grind it thinner to fit exactly, keeping the sides parallel - the taper on the original blade will try to cam out of the slot.

    Before you try to unscrew it, tighten it as hard as you can, then try to unscrew, then tighten, then unscrew - you get the idea...

    Nowadays I'd consider deepening the slot with a Dremel as well.

    Oil for the new leather seal, there'll be a few opinion there, myself I'd soak it for 24 hours in Neatsfoot oil before fitting it.
     
  6. thisisdonald

    thisisdonald Engaging Member

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    I spoke to an old guy who reconditions old engines.. he told me about a mixture 5 parts water 1 part molasses which he dumps engines into which are rusted together - he says it will get ina bout it and break free all the rust - especially useful for the pistons... although if you did that it would probably waste your original leather washer.
     
  7. bhodge

    bhodge Keyboard Hero

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    Hi David, I once used vegetable oil on a hardened leather washer on an old Chinese B3 underlever airgun. Just a few drops, the seal was allowed to soak for an hour or so before wiping up & damping the seal with a tissue. It worked a treat.
     
  8. BJacobs571

    BJacobs571 Engaging Member

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    I have been told to use mineral oil ie 3 in 1. Let it soak in for a while as you need to let it penetrate into the leather. Try to get any excess oil off the front of the seal so it doesn't diesel as much.

    I am pretty sure that is a screw on the front of your piston as rivets don't have a slot in them and most old rifles I have worked on used a screw to hold the seal on.
     
  9. flatrajectory

    flatrajectory Keyboard Hero

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    David,
    Your seal is in good condition, replacing it will make no difference ,in fact it may reduce the power. Soak in oil, mop off any excess and refit it . You can tease the seal open a little by placing a screwdriver in the lip and just work the screwdriver blade around the seal. Do this before soaking it in oil overnight.
    Pete.
     
  10. Meteor62

    Meteor62 Major Poster

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    Neatsfoot oil is what I use on leather seals. Soak it overnight.
     
  11. Patrick

    Patrick Donator

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    To keep the leather washer supple soak it in neatsfoot oil(available from saddlery shops) if you can't get any neatsfoot oil you could soak it in silicone oil to soften it but don't use mineral oil as it rots leather
     
  12. john frum

    john frum Engaging Member

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    I use 3in1 oil which is much as described in old BSA handbooks in the past, it won't do any harm and will fluff up the washer and will not cause any damage if it gets to metal on metal unlike silicon oil.
    Refit the piston with some oil on and then satuate it through the transfer port to allow it to expand, sure it will diesel some but that will go.
     
  13. catman938

    catman938 Engaging Member

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    an old impact driver will shift that screw, but to be honest I agree with above posts, leave it be, soak in a non mineral based oil or it will rot in a very short time.
     

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