AEA Anybody know what causes this?

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MOhunter

MOhunter

Member
Jan 5, 2021
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Kennet, MO, United States
So I've got an AEA HPSS Plus in .25. I replaced the puppet valve and realized I couldn't get it to fill anymore. Once I took some soapy water to it I found out it was leaking between where the pressure tube meets the housing on the rifle. So it took it apart and found a big gash in one of the o-rings. I don't understand what could be scraping these that causes this. I take the grub screw out far enough that's not an issue and of course the pressure gauge is already removed I'm just stumped. And I just noticed one of the new o-rings I installed already has a cut in it. What the hell? Anybody got any ideas?
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WorriedMan said:
Don't know the AEA HPSS but if same happened to me I'd be searching for a burr or sharp edge that shaves "O" ring as it passes during install. WM
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Yeah, I put my pinky finger in it and couldn't feel a thing. what worries me is what happened to all the little pieces that already came off?? I can't see them anywhere. dunno
 
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Normkel said:
I agree with the other suggestions that the part which enters the O rings has a burr or sharp corner. That's virtually always the cause of cut Orings.

Here's a cut O ring in the swivel of a GX CS3 compressor's whip hose. I deburred the sharp corners on the stem, installed new O rings, lubed with silicone grease, and problem solved.

View attachment 569780
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Yeah, I might have to have a professional look at it. BUT....I installed hardware store O-rings currently. Not the exact fit, but it allows the tube to be filled. I did an overnight test and it is leaking down a little bit. I didn't think it would once it was filled. thoughts?
 
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OC_ said:
Usually the port its going into just has a sharp edge.
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Yeah, I'm stumped. Like I said, I couldn't 'feel' anything. and the weirdest part is both O-rings are affected so it has to be something before the fill port because the fill port area is on the very end of the fill part of the tube. Then the two O-rings are following.
 
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MOhunter said:
Yeah, I might have to have a professional look at it. BUT....I installed hardware store O-rings currently. Not the exact fit, but it allows the tube to be filled. I did an overnight test and it is leaking down a little bit. I didn't think it would once it was filled. thoughts?
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When I experience that kind of problem, I revisit the probkem: start over from the beginning with diagnosis, and follow through. As I age, increasingly I overlook something, so that may not be another's problem.

If you are still cutting an O ring, there may still be a sharp or shearing surface, or another area that is a problem but was not detected because it leaked so much less. *

* I am always concerned that my reply may appear to be disrespectful if I am repeating something that my interlocutor probably knows better than I.

I have chased some such problems in which I corrected a perceived problem, replaced the O ring, reassembled and had another leak.

My highly trusted FX distributor told me that he always replaces all the O rings when doing a service, having encountered issues with already installed rings. Funny that I learned that for hydraulics service, marine applications, ABS brake systems, then dummy that I am, didn't follow that when chasing HW100 leaks. :unsure:
 
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MOhunter said:
Yeah, I'm stumped. Like I said, I couldn't 'feel' anything. and the weirdest part is both O-rings are affected so it has to be something before the fill port because the fill port area is on the very end of the fill part of the tube. Then the two O-rings are following.
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Apologies for another post.

I have no acquaintence with AEA, but the motivation in general reponses is the hope that I can offer something, given the lack of specific suggestions.

IME, the most frequent offenders in cut O rings has been threads. When a threaded hole and an O ring pass one another, such as when inserting a barrel with its O rings, past the threaded barrel set screw holes, the end of the last thread often protudes like a well-designed cutter.

IIRC, my Kral Mega had this problem, in spades and required judicious use of Dremel and round stone to chamfer the end of the threaded hole. I could remove the thread part that was protuding, then the next time the barrel was out, then in, the O rings would be cut again. IDK if I have photos of that, but it should be obvious what was the solution.

I have been engaged in many areas of the mechanical repair trades, for 75 years and still encounter many new, or unrecognized issues in PCPs that seemed not to crop up in other systems using similar constructions.
 
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Normkel said:
When I experience that kind of problem, I revisit the probkem: start over from the beginning with diagnosis, and follow through. As I age, increasingly I overlook something, so that may not be another's problem.

If you are still cutting an O ring, there may still be a sharp or shearing surface, or another area that is a problem but was not detected because it leaked so much less. *

* I am always concerned that my reply may appear to be disrespectful if I am repeating something that my interlocutor probably knows better than I.

I have chased some such problems in which I corrected a perceived problem, replaced the O ring, reassembled and had another leak.

My highly trusted FX distributor told me that he always replaces all the O rings when doing a service, having encountered issues with already installed rings. Funny that I learned that for hydraulics service, marine applications, ABS brake systems, then dummy that I am, didn't follow that when chasing HW100 leaks. :unsure:
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Thanks Normkel; I appreciate the posts and feedback. Since I'm going to have to get O-rings from AEA, I'll have to look at it very well when putting it back together, but I can't imagine where this problem would be. I'm just flabbergasted that The Pellet Shop didn't find this problem when I sent it back for service, especially after spending $150 with them. But such is life; I know they want to push out as much as fast as they can. And I can't imagine or see anything threaded in there. But it gives me an idea; I've got a bore camera I use to look at engine cylinder walls. I'll probably take a look at it that way.
 
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Normkel said:
I agree with the other suggestions that the part which enters the O rings has a burr or sharp corner. That's virtually always the cause of cut Orings.

Here's a cut O ring in the swivel of a GX CS3 compressor's whip hose. I deburred the sharp corners on the stem, installed new O rings, lubed with silicone grease, and problem solved.

View attachment 569780
Click to expand...
What size is that Oring.lol, i have a JTS one that is the same rebranded, it is slow to get up to pressure, but always gets there.
 
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