Quote:
Originally Posted by m102404
My internet guess is that your piston o-ring seal needs a bit of work. The burst of full auto is probably getting it warmed up and stretched out to create a nice seal...which will then last for the next couple of semi shots. From a "cold" state...the o-ring will shrink back and not provide an optimum air seal.
If that's the case, either swap the o-ring or reshape it (heat form it). If it's lost it's "rubbery-ness" ditch it and get a new one (good time for other general maintenance as well).
Just a guess obviously, but that's what came to mind from your description.
Best of luck,
Tys
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I was actually thinking of that, but here is the problem with our theory. When i assembeled the gear box with a new modify bearing piston head, i noticed that the o-ring that came with the piston was actually to small, and wasnt sealing properly. So i got an o-ring that sealed properly. When i did a compression test, the piston would make it just past the port, and stop dead. The o-ring is brand new and i made sure it sealed properly.
I think im going to open up the gear box again and have a look at the o-ring, and cylinder itself. Maybe the cylinder got bumped from being handled and isnt perfectly round now, and when its in full auto, the ports in the piston push the o-ring out enough to make a good seal. Once in semi auto it looses the seal?? Just my wild guess lol.
Ryan