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48 Pan Check Valve Seating Problem

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  • 48 Pan Check Valve Seating Problem

    Hi Guys

    My ’48 Pan has been idle for some months and had some pints of oil in the crankcase, which I drained.

    I have the proper spring installed in the oil pump check valve (1 x 8/32” long). It seems the ball bearing is not seating, and oil appears to drip from the crankcase drain hole every 5 seconds.

    Is there a way to seat the ball, without taking the oil pump off the motor? I’ve tried tapping it with a bolt and mallet but with no discernible result.

    Thanks

    Greg


  • #2
    I did a seach of the Forum using "check ball". There's a few threads available. Then one under Panheads seem to be the most informative.

    Comment


    • #3
      Originally posted by sswaney View Post
      I did a seach of the Forum using "check ball". There's a few threads available. Then one under Panheads seem to be the most informative.
      A link would be nice, SSwaney!

      Here's one: https://forum.antiquemotorcycle.org/...ting-ball-seat

      ....Cotten
      AMCA #776
      Dumpster Diver's Motto: Seek,... and Ye Shall Find!

      Comment


      • #4
        MMMMMnnn! - interesting, I'll have to think about this one then?

        Comment


        • #5
          Originally posted by harleygreg View Post
          MMMMMnnn! - interesting, I'll have to think about this one then?
          Do you have a lathe and a diamond dresser, Greg?

          ....Cotten
          AMCA #776
          Dumpster Diver's Motto: Seek,... and Ye Shall Find!

          Comment


          • #6
            https://forum.antiquemotorcycle.org/...mp-check-valve

            Comment


            • #7
              Thanks Cotten and sswaney, I need to check the flow rate as it seems to have reduced significantly, and check if there is any flow through the pump shaft by sealing the ball bearing hole. I've got a couple of ideas and will come back in a week or so, thanks

              Greg

              Comment


              • #8
                Let it puke. Add oil as needed.

                Comment


                • #9
                  Originally posted by harleygreg View Post
                  Thanks Cotten and sswaney, I need to check the flow rate as it seems to have reduced significantly, and check if there is any flow through the pump shaft by sealing the ball bearing hole. I've got a couple of ideas and will come back in a week or so, thanks

                  Greg
                  Any luck, Greg?

                  Sidevalves are notorious for leaking through the adjacent cam cover bushing, so I'm curious what you set up to study an OHV.

                  In an earlier life before digital cameras,,,

                  Pumpseal.jpg

                  ...I installed a late-model seal in a damaged cast iron body.

                  ....Cotten.
                  AMCA #776
                  Dumpster Diver's Motto: Seek,... and Ye Shall Find!

                  Comment


                  • #10
                    Hi Cotten

                    I'm losing just over 1/4 of a pint per week, with no use, to the crankcase. This was measured after warming the bike up for fifteen minutes, and then leaving it to stand for week in cold weather, and then draining the crankcase.

                    Having measured the oil, I intended to remove the ball, and seal the hole, to see whether the leakage was through the ball seal or maybe through the oil pump. The seal didn't work. Given that all the forum threads seem to refer to the ball seal and not the pump, I'm assuming that that is where the problem is?

                    Also 1/4 pint per week would be the maximum, as if the bike were used every day, the leakage would be less, and probably negligible - do you think the 1/4 pint is about right, or would you consider that excessive?

                    The solution could be an inline valve if the bike is not used that much. I could only find the following, as the one from 'feked' is too industrial, and the fittings are for flexible hose, though I'd need a chromed one.
                    https://www.vintagecarparts.co.uk/pr...ng-in-line-tap
                    That could be fitted on the pipe from the tank to the pump.

                    The only other solution I thought of is pictured. I spoke to the guys at Henkel adhesives, and they reckon Loctite 648 would do the trick, if the washer was brass or 9488 if fibre, both would be high temp adhesive/sealant, impervious to oil etc. Maybe a bench test with your setup would prove it? I've used 648 to help seal the intake nipples with good results.

                    What do you think?oil loss 1.jpg

                    Greg

                    Comment


                    • #11
                      You are being a glutton for punishment, Greg!

                      If you are going to attempt to dress a new seat insert, why not just dress the original seat as I have described?

                      And eliminate all the variables of a self-destructing washer, adhesive goober, spring tension, etc.

                      ....Cotten
                      PS: The original seat never had a wide angle on it like your drawing until it was badly worn... Think how a fiber washer will wear compared to cast iron or steel.


                      AMCA #776
                      Dumpster Diver's Motto: Seek,... and Ye Shall Find!

                      Comment

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