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Thread: hw 35 leaking breech fix

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  1. #1
    Join Date
    Oct 2012
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    manchester
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    5

    hw 35 leaking breech fix

    hi guys , i been looking for one of the threads on how to fix the leaking brazed part of the breech/compression chamber on my hw 35, using the jb weld gear...can't find it for love nor money....can anyone direct me ???
    cheers fellas

  2. #2
    Join Date
    Jun 2011
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    Hatfield Broad Oak, Essex/Herts CM22
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    3,967
    At a guess, look up user name "T 20"

    Guys called Mick. Done a lot to his own 35!

    Oh, and welcome to the forum

  3. #3
    Join Date
    Jun 2011
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    Hatfield Broad Oak, Essex/Herts CM22
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    Here you go....

    http://www.airgunbbs.com/member.php?103193-T-20

    Have a look at his threads!

  4. #4
    Join Date
    Oct 2009
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    Stockport
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    Loctite 271

    wash the cylinder with degreaser then thinners...as clean as you can get it..i have washed the cylinders in the dish washer before now...just do not tell the wife

    make a plug for the transfer port

    drip in loctite and make sure it runs around the end plug inside...all the way round, try to not get it on the cylinder walls

    install piston with seal and push till around 5mm from all the way home

    plug transfer port from outside

    withdraw piston to create vacuum and hold it back by having string on the latch rod and wind it round some wood etc...the trick is to hold a high vacuum in the cylinder....the cylinder should be upright with the breech at the bottom also

    leave it over night like this


    In the morning, release the piston, withdraw the TP plug, withdraw the piston, get some doweling 25 to 28mm dia, making sure the end is flat and true, spray glue some 240 grit sand paper to it...do NOT have the sand paper on the sides, just the face...spin this against the breech face to clean off the excess loctite. Renew the paper till the breech face is shiny, now attach some 400 grit wet and dry and polish the face of the breech, again do not let the sand paper touch the sides of the cylinder wall.

    blow out with an airline or air duster , rebuild the gun and test

    if you have an old gun with a 4mm TP, if you install a synthetic seal it may go slammy, if it does you need to sleeve the transfer port down to 2.8mm or so
    Last edited by bigtoe01; 28-05-2013 at 11:37 PM.

  5. #5
    Join Date
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    Hatfield Broad Oak, Essex/Herts CM22
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    Now there's you answer! Like it, nice one Tony! Alway wanted to know how its done

  6. #6
    Join Date
    May 2011
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    Saxmundham
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    Quote Originally Posted by brucegill View Post
    Now there's you answer! Like it, nice one Tony! Alway wanted to know how its done

    Did you ever contact Bowkett over the one piece Apel mounts he had that were made for the old 13mm groove HW35?

  7. #7
    Join Date
    Feb 2012
    Location
    Beith
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    1,147
    Quote Originally Posted by bigtoe01 View Post
    Loctite 271

    wash the cylinder with degreaser then thinners...as clean as you can get it..i have washed the cylinders in the dish washer before now...just do not tell the wife

    make a plug for the transfer port

    drip in loctite and make sure it runs around the end plug inside...all the way round, try to not get it on the cylinder walls

    install piston with seal and push till around 5mm from all the way home

    plug transfer port from outside

    withdraw piston to create vacuum and hold it back by having string on the latch rod and wind it round some wood etc...the trick is to hold a high vacuum in the cylinder....the cylinder should be upright with the breech at the bottom also

    leave it over night like this


    In the morning, release the piston, withdraw the TP plug, withdraw the piston, get some doweling 25 to 28mm dia, making sure the end is flat and true, spray glue some 240 grit sand paper to it...do NOT have the sand paper on the sides, just the face...spin this against the breech face to clean off the excess loctite. Renew the paper till the breech face is shiny, now attach some 400 grit wet and dry and polish the face of the breech, again do not let the sand paper touch the sides of the cylinder wall.

    blow out with an airline or air duster , rebuild the gun and test

    if you have an old gun with a 4mm TP, if you install a synthetic seal it may go slammy, if it does you need to sleeve the transfer port down to 2.8mm or so
    Would have thought keeping pressure on the piston to drive the fluid into the joint rather than vacuum?

  8. #8
    Join Date
    Jul 2000
    Location
    Derby
    Posts
    6,499
    Quote Originally Posted by Big Seth View Post
    Would have thought keeping pressure on the piston to drive the fluid into the joint rather than vacuum?
    I seem to remember that Gerald Cardew recommended keeping pressure on the piston to force the epoxy into the joint too.

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