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Hipac and stock 2240 seals.
https://www.airgunforum.ca/forums/topic54042.html
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Author:  Chewy [ Mon Mar 25, 2013 11:04 pm ]
Post subject:  Hipac and stock 2240 seals.

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!

Author:  v30 [ Tue Mar 26, 2013 5:43 am ]
Post subject:  Re: Hipac and stock 2240 seals.

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.

Author:  Chewy [ Tue Mar 26, 2013 6:48 am ]
Post subject:  Hipac and stock 2240 seals.

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.

Author:  Knappr [ Tue Mar 26, 2013 11:36 am ]
Post subject:  Re: Hipac and stock 2240 seals.

It if its not one thing, its another! Having fun yet chewy? Lol

Author:  tkerrigan [ Tue Mar 26, 2013 12:11 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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

Author:  magnumair [ Tue Mar 26, 2013 12:43 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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.

Author:  rrdstarr [ Tue Mar 26, 2013 2:56 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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!

Author:  barbas929 [ Tue Mar 26, 2013 3:21 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

Replace both with delrin...worked for a buddy of mine for a long time now

Author:  rrdstarr [ Tue Mar 26, 2013 4:13 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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.

Author:  Gippeto [ Tue Mar 26, 2013 4:34 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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

Author:  rrdstarr [ Tue Mar 26, 2013 6:39 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

Okie dokie! So is the delrin held by a little step or just pressed on hydraulically?

Author:  Gippeto [ Tue Mar 26, 2013 7:26 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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

Author:  tkerrigan [ Tue Mar 26, 2013 10:02 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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

Author:  Chewy [ Wed Mar 27, 2013 10:01 am ]
Post subject:  Re: Hipac and stock 2240 seals.

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!

Author:  v30 [ Thu Mar 28, 2013 8:29 pm ]
Post subject:  Re: Hipac and stock 2240 seals.

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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