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Posted: Mon Aug 29, 2011 5:15 pm
by LCTChamp
Gun completely built but piston wont seal
I have checked for particles and cleaned it which didn't fix the issue.
Ideas?
Posted: Mon Aug 29, 2011 5:16 pm
by Gun Freak
Pictures...
Posted: Mon Aug 29, 2011 5:17 pm
by jackssmirkingrevenge
Breech end not cut at 90 degrees?
Not filling fast enough for pressure to build up?
Posted: Mon Aug 29, 2011 5:21 pm
by LCTChamp
Pictures will come but I cant seem to find my camera.
Breech end was cut in a mitre box and then sanded. Im filling with a large air compressor, so I don't think that is the issue. Im dumbfounded
Posted: Mon Aug 29, 2011 5:28 pm
by jackssmirkingrevenge
Is the barrel properly centred and supported? Could the washer keeping the sealing face rubber be making contact with the breech edge?
Posted: Mon Aug 29, 2011 5:57 pm
by Technician1002
You may need to lap the valve to remove any surface imperfections from the valve seat or valve face.
I lap all my non QDV valves.
http://www.youtube.com/watch?v=fhXsH12R ... r_embedded
You can see the ring on the face of my piston where it was lapped on the valve seat seal.
Posted: Tue Aug 30, 2011 6:09 am
by LCTChamp
jackssmirkingrevenge wrote:Is the barrel properly centred and supported? Could the washer keeping the sealing face rubber be making contact with the breech edge?
Ahh
What should I use as a barrel support?
Posted: Tue Aug 30, 2011 6:27 am
by jackssmirkingrevenge
LCTChamp wrote:Ahh
What should I use as a barrel support?
It could be as simple as three screws at 120ยบ in the breech end, adjusted so they protrude enough to keep the barrel centred, and epoxied to prevent air from the chamber leaking into the barrel. They also provide a convenient "projectile stop" keeping whatever you muzzle load from going into the chamber.