Hi chaps, so I've just put my rapid back together again and all is now good after getting all my parts from Dr bob, however ive noticed a little air coming out of the grub screw hole that keeps the valve stem in place when I pull the trigger and have my finger over the grub screw hole. Is this normal for a little air to escape or should nothing be coming out of it? The grub screw is nip tight
it's common but shouldn't happen, some PTFE tape will stop it.
Don't tighten the grub screw down, screw in until it stops and back off 1/2 turn.
Appreciate the advice squinty. I'll have a look at weekend :)
Should it be something to worry about performance wise ? Sorry for a thousand questions I'm terrible with the forum stuff lol.
might cause some inconsistent velocities, slight drop in output.
If it's air tight when left standing, but leaks on firing it must be air from inside the valve port,
you could try a smear of O ring grease around the outside of the fat part of the valve, before you fit it, that might be just enough to seal it.
Hi lads, just a quick update to let you know I now have my gun back and ready for some more ratting after a month of frustration. Took the rapid to John at Caunton gun supplies Newark who sorted the leaking exhaust valve hole by putting in a new M5 grub screw and giving it a slight De tune, what a top bloke. Thanks to everyone for the advice it's much appreciated :)