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 Post subject: FD PCP valve stem seals
PostPosted: Sun Mar 23, 2014 5:32 pm 

Joined: Sat Jan 12, 2013 6:08 pm
Posts: 117
I am tuning 2 FD PCP rifles here. One for me and one for a mate. The poppet valve seals have blown out on both of them. They have become un seated an have ended up with the poppet jammed . Half of the rubber seal is stuck in the valve throat and the other is hanging out of the valve head.

One gun is regulated at 1475 psi, the other un-regged at 1500 psi max fill.

I have tried to glue them back in, but they still deform and blow out!

Has anyone else come across the same problem?? I am already thinking of making my own with delrin heads to put up with the higher pressures.

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