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piston leaks

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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piston leaks

Unread postAuthor: pat123 » Wed Oct 10, 2007 4:58 pm

my piston is leaking on the back where the schrader and the ball valve is connected. I used epoxy and silicone sealant around them i also think it is leaking through the threads on the endcap but i think teflon tape will fix that. have any ideas on how to fix the leak around the schrader and ball valve?

THanks
pat
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Unread postAuthor: singularity » Thu Oct 11, 2007 3:18 pm

more/better epoxy, don't use the 5 minute crap get some 60 minute marine epoxy (if your not using something close to it already)
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Unread postAuthor: noname » Thu Oct 11, 2007 10:43 pm

Globe silicone sealant around the INSIDE of the gun where you think air is leaking out. Then pressurize the gun to 10 psi or so, for around 5 seconds. Hopefully, the pressure will force the silicone through the tiny gap and seal it.
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Unread postAuthor: pat123 » Sat Oct 13, 2007 8:09 am

ok thanks i will try nonames idea first just because i already have the silicone sealant. if that doesn't work ill get better epoxy.
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Unread postAuthor: gwoloshyn » Sun Oct 14, 2007 8:55 pm

Yup, sealing from the outside doesn't do much good. Applying epoxy to the inside has always worked well for me :)
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