FX revolution leaks out the barrel

[far_shot]

My Revolution suddenly developed a very small hiss out the barrel. Several more shots and it didn't get worse. Am I correct to assume the valve seat is leaking? Will an O-ring kit cure it? Kits are fair priced and I'm sure I can do the work required. Thanks for any info

 

[John "spysir" Blount]

Normally not a "valve seat" in an airgun ( not as in gasoline engine) it's the "plastic" head of the "valve stem" sealing against metal and you are correct you need to replace the valve stem and naturally every oring you touch on the way.

Take pictures and share them as I'm sure not everyone here nows that airgun.

John

 

[texagdds]

Aside from the leak - how have you liked the revolution? Semi auto seems pretty cool. I’ve read about them being finicky, but from no one that had one not second hand. 

 

[far_shot]

Well, good/mediocre news...and great news. I took it apart as far as I could go with out getting into trouble. I couldn't get the 4 screws loose that hold the top receiver to the bottom half...which means I couldn't get to the valve seat. FX must assemble that rifle with screw guns. No sign of loctight and I didn't want to heat it,ruining something important. Got the hammer and it's sleeve out and the back half of the 2 piece bolt out.All the front end and barrel out. Seemed to be a lot of manufacturing debris in the fill port area :-( The operating fork is held in it's notches with a wrap of electrical tape!!!. Anyways,I blew compressed air into the fill port and it cleared to the back of the receiver. Blew off all the 486,000 pieces,springs and screws and assembled it. Very complicated unit. Not for the timid to try and take apart.Works perfectly again! It must of had a chip of something in the stem seat.......got lucky! All my info says 12 shot mags, but all 3 of mine are 14 shot. Functioned flawlessly with 18 gr JSB. Fails to reload every so often with 15 gr JSB's. No pressure loss in 4 hours. I only took this picture of the tape holding the fork in place (lower center of the picture)before I moved on with the rest of the disassembly.

Five shots at 25 yards.

2 chickens at 55 yards. 

parts view: https://spares.bagnallandkirkwood.co.uk/wp-content/uploads/2017/07/REV-FX-Revolution-Exploded-Parts-List-and-Diagram.pdf