View Full Version : Small Hiss Sound

06-07-2007, 09:06 PM
I can hear a small hiss sound if I put my ear near the feed neck. I changed the cup seal, and I still hear it. Is this a problem? Or do I need to change the o-rings on the valve body, or something else?

06-07-2007, 09:25 PM
have you recently re-assembled your gun? You may have put the valve in backwards. The large hole faces toward the barrel and the small hole faces toward the velocity adjuster.

06-07-2007, 10:00 PM
replace the orings on the valve and install it as Charfizcool said

06-08-2007, 04:35 AM
Lube the o-rings and also make sure you cock the marker, before you air it up.

06-08-2007, 08:47 AM
you can also put teflon tape on the valve set screw.

06-11-2007, 11:27 PM
I cleaned and lubed everything, and now no hiss sound. It may have been the set screw that was lose. Good tip on the teflon.

06-12-2007, 03:33 AM
If it was leaking through the set screw then one of the o-rings wasn't seated correctly. I'm glad the tape worked for you. Chances are if you removed the valve and reassembled it, you fixed the leaking o-ring then. Using tape is just a back-up for the o-rings. The cup seal on the valve pin and the valve o-rings are the 2 most common places people get leaks.