RT Classic revive

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  • Space_weazel_65
    Registered User
    • May 2003
    • 22
    #1

    RT Classic revive

    Trying to get an RT classic 10xx series serial number back to life,
    Saved it from the bottom of a parts box.
    I replaced all the seals as it was leaking like a sieve, now when it's gassed up bolt locks in to the sear like normal, but when I pull the trigger it will burp (bolt cycles several times) or the bolt will jump forward a half inch and hang bleeding air. If I hold the trigger down air continues to flow past the on/off and down the powertube past the bolt.
    I also measured the on/off pin at .760 (thought it was supposed to be .750) but I don't remember how that affects how the on/off operates.

    UPDATE: Just swapped from an almost empty bottle to a full one, and elongated the sear arm by a half turn, and now the when the trigger is pressed the bolt will only burp as it did before and very quickly, still leaks when the trigger is released.
    Any ideas?

    Thanks
    Last edited by Space_weazel_65; 02-28-2014, 12:32 PM.
    !Weazel! :P
    Tags: None
    • vintage
      Registered User

      • Aug 2013
      • 1787
      #2
      might be trash on an o ring.

        Comment

        • bbotts77
          Dirty Frank
          • Oct 2009
          • 558
          #3
          This was happening with the one I bought a few months ago. When I took the reg off of the valve, I found an extra oring hanging out in there. Works fine now.

          My Feedback

            Comment

            • Space_weazel_65
              Registered User
              • May 2003
              • 22
              #4
              I have checked all the o-rings and repacked the reg before I started so no extra rings there
              The on/off is just not shutting off, but I have a longer than standard on/off pin which should close the on/off sooner?
              !Weazel! :P

                Comment

                • athomas
                  Of course it works-its AGD
                  • Jan 2002
                  • 8039
                  #5
                  Check the regulator valve pin oring. If that oring leaks, it can feed through the regulator pin assembly and keep a flow of air going to the chamber even if the on-off is closed.

                  The RT had a whole assortment of on-off pin length configurations available. The 0.760" pin length should work fine.

                  The trigger should be about a credit card thickness in front of the trigger rod when the trigger is held against the safety with the valve aired up and ready to fire. If the trigger is making contact with the trigger rod, it is too long and will cause short stroking and recharge issues.
                  Except for the Automag in front, its usually the man behind the equipment that counts.

                    Comment

                    • Space_weazel_65
                      Registered User
                      • May 2003
                      • 22
                      #6
                      Trigger is in spec, I did replace the orings on the reg pin, though perhaps they are a little off, ordering a new reg pin assembly shouldn't cost much.
                      !Weazel! :P

                        Comment

                        • athomas
                          Of course it works-its AGD
                          • Jan 2002
                          • 8039
                          #7
                          Originally posted by Space_weazel_65 View Post
                          Trigger is in spec, I did replace the orings on the reg pin, though perhaps they are a little off, ordering a new reg pin assembly shouldn't cost much.
                          Its not the orings on the regulator pin assembly. A leak in those will cause venting out the side hole in the valve. The one that will leak into the front chamber is the one that the pin goes through into the back section of the valve.
                          Except for the Automag in front, its usually the man behind the equipment that counts.

                            Comment

                            • Space_weazel_65
                              Registered User
                              • May 2003
                              • 22
                              #8
                              Sorry for the revive, had a work trip, a long ass one.
                              The oring at the back that the reg pin goes through was also replaced, and the pin fits snugly and smoothly in to it.
                              I am still at a loss.
                              !Weazel! :P

                                Comment

                                • athomas
                                  Of course it works-its AGD
                                  • Jan 2002
                                  • 8039
                                  #9
                                  Things that need to be checked/replaced:

                                  1) Replace bolt spring if it hasn't been done.
                                  2) Install a shorter powertube spacer to stop the leak out the front when the trigger is released.
                                  3) Check that there is only one oring embedded in the on-off top recess. The older retro/classic/emags only used one oring above the on-off not two that the classic AIR valve and newer X-valves use.
                                  4)Turn up the velocity
                                  Except for the Automag in front, its usually the man behind the equipment that counts.

                                    Comment

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