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Old 05-24-2011, 10:13 AM   #11 (permalink)
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Not to thread jack but do you really think the brass button in the valve would cause that? The only reason I ask is I have 2 CA sheridans running fine with out the button, but maybe I got lucky.
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Old 05-24-2011, 10:48 AM   #12 (permalink)
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So yeah, something's definitely wrong - it's venting between shots. nofxkid's explanation is what I figured, but that wouldn't make sense here. And yeah, they're stock hammer and valve springs, though both are new. The really weird thing is I have two Sheridans that are doing it - one I rebuilt, and one that literally just came back from PPS...?

Edit: Just realized I didn't dry fire the PPS one, so that may be fine. I know it has a new spring, so that could have been holding the valve open as I aired it up de-cocked. That sounded wrong.

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That shouldn't happen on sheridans with the stock springs. You running those? Also, did you put the little brass "button" back into the valve chamber?
Button? My valve consisted of the pin, spring, valve body, and chamber plug.

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Old 05-24-2011, 11:37 AM   #13 (permalink)
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Not to thread jack but do you really think the brass button in the valve would cause that? The only reason I ask is I have 2 CA sheridans running fine with out the button, but maybe I got lucky.
No, probably not it but it does add a little bit of length to the valve spring and help keep it centered. I've actually forgot to put them in before and not had the issue.

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Button? My valve consisted of the pin, spring, valve body, and chamber plug.
There's a little brass piece that sits in the bottom of the valve chamber. It might still be in there as a lot of times they don't come out very easily.

While I've certainly had enough cockers behave like this I can't remember a stock sheridan doing it. The stock valve spring is hard as hell by comparison. I know it's a back bottle but there's no RVA on there and no shims on the spring right? Also, have you tried other tanks? If both guns are doing it then maybe something is wacky with the tank.
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Old 05-24-2011, 11:41 AM   #14 (permalink)
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Right, spring goes into the hole on the ASA.
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Old 05-24-2011, 12:58 PM   #15 (permalink)
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It could also be that the o-ring on the valve body isn't seated quite right you can have that leak. I've had the o-ring slip and so it's curled around the valve body and there's basically no seal at all going on.
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Old 05-24-2011, 01:03 PM   #16 (permalink)
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I thought about that - the weird thing is, it seals when cocked. I left it hooked to an HPA tank overnight with ZERO loss.

I'll replace the new hammer spring with an older, worn one and see if that stops it from pushing the valve open.
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Old 05-25-2011, 10:53 AM   #17 (permalink)
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Heh, so..... yeah.

I'd replaced the hammer spring with a new PGP one from Palmers. Turns out, that spring was about 1/2" longer than the old one; I replaced it with the old one, and the gun seals and fires perfectly. Oops.

The PPS gun vents if you hook up air without cocking it, but is fine if it's been pumped and will seal perfectly after being fired. I'm willing to bet that part of the valve tuning (and that liquid glass pump stroke) is weakening/removing the valve spring, so as long as I remember to pump it before airing it up, I'm all good.

Thanks folks!
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