Reply To: FX Impact Valve Tube O-rings & Quad Rings Leak – Fixed (thanks Ernest)

Forums PCP Airguns FX Impact Valve Tube O-rings & Quad Rings Leak – Fixed (thanks Ernest) Reply To: FX Impact Valve Tube O-rings & Quad Rings Leak – Fixed (thanks Ernest)

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Ross, my reasons were similar for the purchase. It’s a lot simpler rifle to repair than the Wildcat that I also own. But it has a lot more to go wrong on as well.

Re the reg adjuster screw o-rings. Fitting the top/first o-ring is straight forward by hand. Once that’s seated, you’d need to move it down to the second seat. Getting the second o-ring over the first one seated is next to impossible as o-ring will not stretch that much and snap. So don’t even bother trying that.

Moving first o-ring to second is very tricky unless you have a rubber vice to secure the screw in and the type of brass picks in my picture. Damaging the screw was my biggest concern as it’s brass. Once you get the first o-ring out of its seat (most difficult part), it rolls over easy in second seat.

I broke so many as the stretch limit of the 2x1nbr90 o-ring is very low. Brass pick with a seating pick (ball on end of it to de-seat evenly) is a must have if you don’t want to break as many as I did. I used a steel pick to pull the o-ring out enough (left hand) and a fine ball point pen (in right hand) to push the rest of it out – never again this way. Will use proper picks next time.