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Leak down the barrel

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    Leak down the barrel

    Hello MCB,


    Dug up a project I lost interest in ...
    I've had a few bumps which forced changes on this one, but I dug it up this we ... And decided to air it up for the first time since I put it away.

    it's a half block midget pump with air through frame.

    The cocker leak down the barrel when put 100 psi in the asa when the marker is cocked. Could it be anything else than the valve seat?

    Also, if it is not cocked, it leak pretty bad with 100 psi. But that may just be there is not enough pressure holding the valve closed when the hammer is resting on it ...

    Looking at it, I get motivated to finish it again ... It would be a cool open class ... Very small and light for a cocker ...

    Thanks MCB,
    X
    Love my brass ... Love my SSR ... Hard choices ...

    looking for red/black or blue/silver phantom.
    XEMON's phantom double sided feed


    Keep your ATS going: Project rATS 2.0
    My Feedback

    #2
    Originally posted by XEMON View Post
    ... it leak pretty bad with 100 psi. But that may just be there is not enough pressure holding the valve closed when the hammer is resting on it ...
    I guess it isn't enough pressure in any case, the valve spring is too light, or as you stated the valve seat/cupseal is no good. If you can crank up the pressure a bit and see what happens, then you can play the springing game.
    Velcor will save us...

    Current MCB Feedback : https://www.mcarterbrown.com/forum/b...opusx-feedback
    Legacy MCB Feedback (Wayback Machine)

    Comment


      #3
      I may pop a 12g in it and see what happens ...
      thanks
      Love my brass ... Love my SSR ... Hard choices ...

      looking for red/black or blue/silver phantom.
      XEMON's phantom double sided feed


      Keep your ATS going: Project rATS 2.0
      My Feedback

      Comment


        #4
        What valve do you have in it?

        Some cupseal materials lose their "memory" and need to be left under air pressure for a while to seat properly, too.
        And God turned to Gabriel and said: β€œI shall create a land called Canada of outstanding natural beauty, with majestic mountains soaring with eagles, sparkling lakes abundant with bass and trout, forests full of elk and moose, and rivers stocked with salmon. I shall make the land rich in oil so the inhabitants prosper and call them Canadians, and they shall be praised as the friendliest of all people.”

        β€œBut Lord,” asked Gabriel, β€œIs this not too generous to these Canadians?”

        And God replied, β€œJust wait and see the neighbors I shall inflict upon them."

        Comment


          #5
          Originally posted by Jordan View Post
          What valve do you have in it?

          Some cupseal materials lose their "memory" and need to be left under air pressure for a while to seat properly, too.
          No idea ... I'm not a cocker guy πŸ˜…
          might make a delrin seal if this one doesn't work ...

          Click image for larger version

Name:	PXL_20210503_130452515.jpg
Views:	126
Size:	1.80 MB
ID:	124029

          Love my brass ... Love my SSR ... Hard choices ...

          looking for red/black or blue/silver phantom.
          XEMON's phantom double sided feed


          Keep your ATS going: Project rATS 2.0
          My Feedback

          Comment


          • OpusX

            OpusX

            commented
            Editing a comment
            ewwww looks greasy. clean that up and use oil.

          • XEMON

            XEMON

            commented
            Editing a comment
            I threw oil inside the valve in the hope of sealing it before opening it ...
            I'll clean it up before closing it and throwing a 12g in.
            It's a pump build so it shouldn't hurt too bad.

          #6
          Originally posted by XEMON View Post

          No idea ... I'm not a cocker guy πŸ˜…
          might make a delrin seal if this one doesn't work ...

          Click image for larger version

Name:	PXL_20210503_130452515.jpg
Views:	126
Size:	1.80 MB
ID:	124029
          Looks like stock 2k+. They're good valves but don't seal up at 100psi.

          Like the others have suggested, try a higher input pressure if possible. Start at 300psi, maybe.
          And God turned to Gabriel and said: β€œI shall create a land called Canada of outstanding natural beauty, with majestic mountains soaring with eagles, sparkling lakes abundant with bass and trout, forests full of elk and moose, and rivers stocked with salmon. I shall make the land rich in oil so the inhabitants prosper and call them Canadians, and they shall be praised as the friendliest of all people.”

          β€œBut Lord,” asked Gabriel, β€œIs this not too generous to these Canadians?”

          And God replied, β€œJust wait and see the neighbors I shall inflict upon them."

          Comment


            #7
            Yup, clean it up, replace the valve body o-ring, lightly oil (Synthetic Pneumatic tool oil) and reassemble. Stock WGP valves work great down to about 250 psi below that you have to get creative with the springs to keep them sealed. There should never be grease in a Cocker valve train and that is either grease or old congealed oil.
            "When you are asked if you can do a job, tell 'em, 'Certainly I can!' Then get busy and find out how to do it." - Theodore Roosevelt

            Feedback Link - https://www.mcarterbrown.com/forum/b...del-s-feedback

            Comment


              #8
              Originally posted by XEMON View Post
              it's a half block midget pump with air through frame.
              Am I the only one that want to see a picture of that custom cocker?

              Comment


                #9
                To low pressure 100psi won’t do it you need enough pressure on the back of that valve to hold it close. Should just need to rase input pressure.

                Comment


                  #10
                  Originally posted by Grendel View Post
                  Yup, clean it up, replace the valve body o-ring, lightly oil (Synthetic Pneumatic tool oil) and reassemble. Stock WGP valves work great down to about 250 psi below that you have to get creative with the springs to keep them sealed. There should never be grease in a Cocker valve train and that is either grease or old congealed oil.
                  Definitely grease ... if oil doesnt work, use grease


                  Originally posted by Alexndl View Post
                  Am I the only one that want to see a picture of that custom cocker?
                  Ill save that for when i get it shooting ... but i could get persuaded
                  Love my brass ... Love my SSR ... Hard choices ...

                  looking for red/black or blue/silver phantom.
                  XEMON's phantom double sided feed


                  Keep your ATS going: Project rATS 2.0
                  My Feedback

                  Comment


                    #11
                    Little update:

                    Cleaned the grease off, put it back together and BAM! It shoot!

                    Found 2 other small leak, but got them fixed up really fast and now it seal nice and good.

                    Thanks for everyone's help for my first cocker build. I put it on the scale and it comes up to 1.245Kg
                    light and compact, it may even take me away from my sheridans.
                    ​​​​​​
                    Love my brass ... Love my SSR ... Hard choices ...

                    looking for red/black or blue/silver phantom.
                    XEMON's phantom double sided feed


                    Keep your ATS going: Project rATS 2.0
                    My Feedback

                    Comment


                    • XEMON

                      XEMON

                      commented
                      Editing a comment
                      That weight is with a stainless barrel ...

                    #12
                    So.... we have been waiting enough?
                    pictures?

                    Comment


                      #13
                      Originally posted by Alexndl View Post
                      So.... we have been waiting enough?
                      pictures?
                      Ok ... Here it is (with a 13Ci) ...
                      I can make a build thread with before and after if people want to ...

                      Click image for larger version

Name:	PXL_20210505_212943158.jpg
Views:	96
Size:	3.66 MB
ID:	125291(PS: yes, the gauge is shot, I need to replace it ...)
                      Love my brass ... Love my SSR ... Hard choices ...

                      looking for red/black or blue/silver phantom.
                      XEMON's phantom double sided feed


                      Keep your ATS going: Project rATS 2.0
                      My Feedback

                      Comment


                      • Cdn_Cuda

                        Cdn_Cuda

                        commented
                        Editing a comment
                        It’s so tiny!

                      • OpusX

                        OpusX

                        commented
                        Editing a comment
                        Chopped hingy with a gas through mod inspired by a tippy pro-lite?! Such MCB!

                      • XEMON

                        XEMON

                        commented
                        Editing a comment
                        πŸ˜‹

                        Always wanted an air through frame (nearly bought a pre-made one) then came across the midget and saw this ...

                        Just bought a stainless tube to replace the flexible line ... The flop is terrible ...

                        Originally played with the pump assist kit, but it doesn't stop leaking ... No matter what I do ...
                        So got this pump kit and it matches the barrel length perfectly ...
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