It's nice to know how to fix that problem.
I wonder if replacing the metal check ball with a rubber ball would immediately improve the sealing and performance of the pump on these?
Actually I do not think it would. Maybe for a while but you need to fix the real problem. If it is a bad seat ie burrs the ball will get chewed up. Without taking it apart and fiddling with it you do not really know the issue. I can guess that the seat is not fitted correctly, or the ball is sitting on the seat and there is no chamber around it to keep it from falling off, or minimizing vibration. Or it could be the flap valve on the piston rod. That little engine vibrates a lot.
Here is bottom of my pump on my 1/4 scale. I used a Teflon ball (just an experiment,no real reason) in a restricted cage. It has a top with a little pip that keeps the ball from coming completely off the seat. There is a trick, taught to me by long time builder of live steam locomotives, to making a seat.
You form the seat hole from the bottom not the top. If you drill from the top the vibration of the messes up the seat. After you get the hole drilled. Next is to ream from the bottom. Next you take a ball the size of the one you are going to use, preferable a ball bearing since it is round, put it on the seat and give it a rap with brass hammer and brass rod. This is an art, it must be a dead blow no bounce, takes some practice. Now through away that ball and use a new one in the hole. My Ericsson has been running since 2015 (about 600 hrs) so far no issues with that Teflon ball.
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Here are all the parts and finished pump, the pump started out as a block of Aluminum and was carved out so to speak on mill and lathe (no CNC just by hand).
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Pump is about 1 x 1 x 4 not including the prime cup or top clevis etc.
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Bob
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