Weihrauch Hw 77 & 97

Forums Springers, Pumpers, C02, & Others Weihrauch Hw 77 & 97

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    MddogHutty
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    Hi guys just a quick question does anyone know of how to make a compression tube end cap removal tool ie how to make one by a drawing or description of dimensions. As my compression tube on my hw77 has a leak so not getting power to the pellet has it should be. So want to remove the end cap and reseal it. Has you guys may know you cannot seem to buy the 25mm compression tubes anymore that is why i am looking for anyone which has the know how to make this tool. If anyone can help please leave me a comment or pm me thx.

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    MddogHutty
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    I was thinking of something like this tell me what you think guys would this deign work let me know what you think and if anyone has made one like this, and do you know the precise dimensions to make the tool thx.

    • This reply was modified 1 week ago by MddogHutty.
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    JohnL57
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    I’m certainly no expert but I saw a Crescent type adjustable wrench handle padded with a leather strap used to unscrew the end cap on an HW55 rebuild. The person placed the padded round end of the handle in the trigger slot and tapped the wrench part with a block of wood to break loose the cap then used the wrench as a handle to finish unscrewing the cap. Of course a spring compressor was used as well. 
     

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    MddogHutty
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    John I think you have got the wrong end of the stick with my question I am after a 3 pin spanner to undue the end cap off the compression tube not the end cap off the rifle to the spring. That’s if I have followed you correctly.

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    JohnL57
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    “MddogHutty”John I think you have got the wrong end of the stick with my question I am after a 3 pin spanner to undue the end cap off the compression tube not the end cap off the rifle to the spring. That’s if I have followed you correctly.

    
You are correct-I misread you post.

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    ChuckHunter
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    Why would you want to take apart the compression tube and for that matter I don’t think it does come apart. 
    you need to pry the old seal out with a dental pick or something similar and install a new one… it’s that easy! 
    Or if your talking about the piston seal itself then full disassembly is required from the rear and removing the spring. With a spring compressor or you might hurt yourself!

    James from Michigan ,

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    MddogHutty
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    Hi James all new seals rebuilt the rifle due to drop in power I checked the compression tube blocked the transfer port and put it in water and there’s a leak coming from the cap. I have been told to epoxy round the the line and create a vacuum to pull it in. I would rather unscrew it and reseal for a better job then you know it is fully sealed. I hope this tells you what I’m after doing thx.

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    Wadcutter
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    Seems like the way to go would be upgrading to the newer 26mm tube and seal.  
    http://www.airgunspares.com/store/product/9634/WEIHRAUCH-HW77-%26-HW97-Compression-Tube-Part-No.-9202/

     

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    scrane
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    A leaky end cap was a common problem on older HW35’s. It was usually corrected by filling the gap with Loctite. The end cap was brazed on the 35 and this might be the case for the  77, too. There were a few methods used to do this. A Google search will supply numerous results. By no means give up the 25mm.

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    scrane
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    This is interesting to me as I have a HW77 with a 25mm piston, also. If it were mine I would just use the standard Loctite fix. Even if you are able to remove the cap you’d do that anyways, right?
    I’d stay away from epoxy. It does not flow as well as Loctite, and you’d have a real time constraint. 

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    MddogHutty
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    Thx for the comment scrane what I have decided is to create a seal and loctite it and pull in the loctite to the seem. Failing that if that fails I will try to take off the end cap to reseal it if that fails I’ll upgrade to a 26mm piston and compression tube but thx for all the replies guys.

    • This reply was modified 1 week ago by MddogHutty.
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    Wadcutter
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    One more option might be to silver solder the leaky seam then turn it back down to spec. 

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