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Chewy
PostPosted: Mon Mar 25, 2013 11:04 pm 
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So I hipac's the 2240 - they were waiting for me when I got home. . Hear a leak right away. Chewed the stock seal real good. Thought ok, HPA is still in with the hipac'd 2250. Well the stock seal went on it as well. 2 seals in less than an hour!! I know your supposed to change em. One is done and firing as good as ever. Next one Tuesday.

Lesson learned - when you get new seals with a HPA product, bloody well use em!

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v30
PostPosted: Tue Mar 26, 2013 5:43 am 
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Were you pressurizing the hipac to over 2000psi ?
My stock seal is still doing fine but i only fill to 2000. In my other 2240 I changed to the hipac seal because I regularly fill to 2500.
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Chewy
PostPosted: Tue Mar 26, 2013 6:48 am 
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Well thats just it, the leaking started around 1400 psi on the 2240. When i took the valve out it was looking ratty. It didn't survive one fill.

The 2250 seal blew out but i really did expect it to. I wanted to see how long the stock seal would hold. I will change her out tonight and be back in business soon enough.

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Knappr
PostPosted: Tue Mar 26, 2013 11:36 am 
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It if its not one thing, its another! Having fun yet chewy? Lol

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tkerrigan
PostPosted: Tue Mar 26, 2013 12:11 pm 
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The valve stem seal won't hold up at 1800psi + pressures for long either. It can be easily replaced with a disco valve stem that fixes the problem. Regards, Tom

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magnumair
PostPosted: Tue Mar 26, 2013 12:43 pm 
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Tom the original seals and valvestem won't stand any psi that I use. I change them before I do anything else, but the Hipac is a real cheap pcp for sure. Hey Tom are you still playing around with your Sam Yang Big Bore?


George.
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rrdstarr
PostPosted: Tue Mar 26, 2013 2:56 pm 
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magnumair wrote:
Tom the original seals and valvestem won't stand any psi that I use. I change them before I do anything else, but the Hipac is a real cheap pcp for sure. Hey Tom are you still playing around with your Sam Yang Big Bore?

George.


George?
What seal are you talkin' about on the 2240? The one at the piercing stem? Hi-Pac provides one. Or is it the valve stem and its seat? It wouldn't be the big o-ring in the valve that keeps it sealed?

Newbie askin' questions!

THANKS!

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barbas929
PostPosted: Tue Mar 26, 2013 3:21 pm 
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Replace both with delrin...worked for a buddy of mine for a long time now

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rrdstarr
PostPosted: Tue Mar 26, 2013 4:13 pm 
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Do you mean the seal on the stem? I really haven't look at that to close yet. Is it easy to remove and add the delrin one? I can machine whatever i need.

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Gippeto
PostPosted: Tue Mar 26, 2013 4:34 pm 
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Stock valve stem has a soft seal...it gets ripped up by the pressure.

Easiest to just machine a totally new stem...you don't need the piercing pin with the hipac.

Piece of drill rod...bit of Delrin (nylatron works good too)...for a start, just duplicate the stock piece sans piercing pin...no brass needed. :wink:

It's a 5-10 minute job at most. :)

Can reduce the od and smooth/blend the shape if desired.

Al
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rrdstarr
PostPosted: Tue Mar 26, 2013 6:39 pm 
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Okie dokie! So is the delrin held by a little step or just pressed on hydraulically?

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Gippeto
PostPosted: Tue Mar 26, 2013 7:26 pm 
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I use a blind hole in the delrin...a few thou smaller than the drill rod. Press the drill rod in with the tail stock. Seems to hold just fine.

Al
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tkerrigan
PostPosted: Tue Mar 26, 2013 10:02 pm 
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magnumair wrote:
Tom the original seals and valvestem won't stand any psi that I use. I change them before I do anything else, but the Hipac is a real cheap pcp for sure. Hey Tom are you still playing around with your Sam Yang Big Bore?
George.


George, you must have me confused with a different Tom, I have a Sam Yang .25 500cc rifle that I just got a month ago, and have posted about problems with a Career Ultra 9mm in the past. It is shooting just fine now. It was down six months trying to find a linkage screw, finally just had one made for $35. Regards, Tom

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tkerrigan Jefferson, Oregon
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Chewy
PostPosted: Wed Mar 27, 2013 10:01 am 
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Knappr wrote:
It if its not one thing, its another! Having fun yet chewy? Lol


Actually yes!! I was a little impatient at first but taking the time to this a few times I've learned through trial and error. I fully expected the stock seal to blow, I was just wondering how long they would last. Took a chance maybe as there maybe is something that can hurt the valve? I don't know, but it was just an experiment.

Both hipac units have the hipac seal in them now and they hold air just fine!

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v30
PostPosted: Thu Mar 28, 2013 8:29 pm 
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v30 wrote:
Were you pressurizing the hipac to over 2000psi ?
My stock seal is still doing fine but i only fill to 2000. In my other 2240 I changed to the hipac seal because I regularly fill to 2500.


I spoke too soon, my stock seal started leaking today :(
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