Reasons for a leaky Regulator Piston Assy.

[Ando]

Does anyone know what would cause the Reg Piston Assy to leak out the back?

Packings are all changed and I've thrown plenty of oil into the gun so I'm at a loss...

Edit: Yaa...Post 300

[vf-xx]

Reg piston oring bad/broken/missing? One of the two that are between the valves?

[Ando]

I've cked all the packing. Even compaired my other valve to that one and everything is there. If i install a piston from another valve, the leak stops so...

I'm lookig at pop the Reg piston open. They say not to but maybe there's a packing of some sort inside. Does anyone know if it has internal packings?

[Ir0nExpress]

http://store.airgundesignsusa.com/index.cfm?fuseaction=catalog.prodInfo&productID=30&categoryID=18

Sounds like your problem?

[Ando]

[flyingpootang]

Usually it's the reg piston o-ring that is nicked...

[Ando]

Usually it's the reg piston o-ring that is nicked...

[Ando]

Well...Looks like that fixed it. There's a rubber piece inside that was the actual problem. There's something inside that created a grove on it and basically keep it from sealing. I just turned it 180 so the smooth part was facing the hole at the forward part of the piston and BAM!!! No leak.
Hopefully that holds for another 10+ years

[athomas]

Once the rubber piece seats itself, it will eventually leak. You need a new higher pressure piston assembly. Since you had yours apart, add a shim to add more tension to the spring. That will increase the pressure release pressure and should stop your leak.

[Ando]

Once the rubber piece seats itself, it will eventually leak. You need a new higher pressure piston assembly. Since you had yours apart, add a shim to add more tension to the spring. That will increase the pressure release pressure and should stop your leak.

I was going to do just that if turning the rubber seal around didn't fix the problem but it did so my Retro should be good for another 13 years :) If it comes back I'll add the shims.

[athomas]

I was going to do just that if turning the rubber seal around didn't fix the problem but it did so my Retro should be good for another 13 years :) If it comes back I'll add the shims.

You'll be adding shims sooner than later, I'm guessing. The level 10 wasn't around 13 years ago, so the lower operating pressures didn't operate near the release pressure of the piston assembly like it does now.