Fwb124 piston seal replacement

Forums Springers, Pumpers, C02, & Vintage Fwb124 piston seal replacement

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    Sammi68
    Participant
    Member

    Does anyone have a link to a video of opening one of these up to replace the seal? I've read some basic instructions but videos sure do help. I looked online but nothing came up. Mostly concerned about how the safety comes apart.

     

    Any help would be appreciated.

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    rob_g
    Participant
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    Here are some links I found when I tried to do mine this year. I had problems getting the spring out using wood clamps so I decided it would be better to let somebody with the experience and correct tools do it instead. I put a Maccari kit into it and its great.

    https://www.airrifleheadquarters.com/page/page/251483.htm

    https://www.rimfirecentral.com/forums/showthread.php?t=292368

    http://anotherairgunblog.blogspot.com/search/label/Feinwerkbau

    http://anotherairgunblog.blogspot.com/2009/10/derricks-two-tone-fwb-124.html

    https://forum.vintageairgunsgallery.com/feinwerkbau-rifles/feinwerkbau-modell-124/

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    warlord
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    You will need a spring compressor. Use a small block of wood against the end  but not interfering with the safety. Back it out slowly and use zip ties as it comes out and they will hold the safety in place. When replacing, leave them on and cut the first one  when the front of the safety is well inside the tube. The last one can just be pushed off. Hope this makes sense.

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    warlord
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    Should also mention, when starting use very slight pressure on the end cap to facilitate removal of the bolt that holds the end cap in place. When replacing the bolt, it is critical that the bolt hole in the tube and the screw hole in the cap line up perfectly. It is very easy to cross thread it! You should be able to finger thread it all the way in. If it is tight and you are using a wrench on it ..it is probably cross threaded.

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    Motorhead
    Participant
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    On 124/127 guns, the ROOF of compression chamber can and will get the old seal material pounded into the corners.

    You need to fabricate a long scraper to get it all out of the corners against roof or the new seal will get screwed up as it impacts/ bottoms out against it.

     

    A THIN WALL piece of @ 1/4"- 1/2" tubing crushed flat on the end, then ground flat to have sharp edges works great for this task.

     

    Scott S

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    Sammi68
    Participant
    Member

    Thanks for all the input and the tips and tricks. I haven't got there yet but it's on the list. Breech seal looks good so assume it just needs a new piston seal. Anyone else surprised there's no handy videos out there on how to do this?

    Thanks again for all the input.

     

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