The two 392 valves I got from Crosman a few years ago had a brass shell with the soft rubber seal on the valve stem.Good to know that they've upgraded the valve stems to the Delrin stems.Some tips:When you install the roll pin for the pump arm, position the split in the pin forward. It'll minimize the wear on the pivot hole.Also before you drive out the pump arm pin, open the pump arm to relieve the pressure on it.Remove any burrs around the roll pins and lubricate with light grease before reassembly.Good luck
Quote from: wll2506 on March 03, 2019, 02:11:49 PMTook apart my 392 this am and the compression tube is .764+ish ID Some of that ID is paint I think, the valve is measuring .765 and yes the valve barley fits in ... no room for any tape or ? for sure. That Idea is a no go for sure !!It is back to see if the new adjustable piston that comes in Wed I think and a few valve tweaks will boost the speed up just a bit. A lighter valve spring should make a difference, the stock spring IMHO is way, way to heavy. That heavy of spring may have been put in for liability so no sharp hit could possible set it off, I don't know.wllIf you go too light on the valve spring, the hammer spring will overcome it when uncocked. The hammer could rest too far forward for the bolt to catch causing the gun to be uncockable. I know from experience....Have fun!
Took apart my 392 this am and the compression tube is .764+ish ID Some of that ID is paint I think, the valve is measuring .765 and yes the valve barley fits in ... no room for any tape or ? for sure. That Idea is a no go for sure !!It is back to see if the new adjustable piston that comes in Wed I think and a few valve tweaks will boost the speed up just a bit. A lighter valve spring should make a difference, the stock spring IMHO is way, way to heavy. That heavy of spring may have been put in for liability so no sharp hit could possible set it off, I don't know.wll