Best O-ring Kits to buy for ANY PCP/pump
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Topic: Best O-ring Kits to buy for ANY PCP/pump (Read 1620 times - 1 votes)
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JimmyD.
Plinker
Posts: 156
yes
Real Name: James
Best O-ring Kits to buy for ANY PCP/pump
«
on:
January 26, 2019, 08:18:15 AM »
Guys, I do know Buna Nitrile 70-90 durometer are usually used. I also understand a hand pumps static bearing rings are usually Teflon or PTFE.
I need some info for best all around kits to buy in bulk for PCP resealing. I'm talking types, durometers, finish, applications (absolute best) back up rings (0.010 shim type working in tandem)
I do NOT have The Baleigh lathe, mill, Helios tooling I wish I did. I'm going to have certain guns gone over and I want every gland chamfered. I'd like tight tolerance mil-spec rings that'll last 3 decades, not 10 years if lucky.
So one big question I have, is what's some great entire range O-ring Kits you guys have found from Marcon, The O-ring Store, Mil-Spec, etc?
Since I can buy a Chinese Hill clone for $45.00, or another Hill for $199.00, I'd like full kits for pumps, any leaky rifles.
I know I need a M27x3, but a SAE #213 will be a little tight.
Has anyone found complete O-ring blueprints of guns? EVERY PCP should come with that info. Hill should NOT have a diagram to scale that you match old rings to on a picture. I want to know exact gland & O-ring sizes. Tolerances, cross reference charts of 6 possible measuring systems used on PCP'S made in many different Countries.
Here's a good question as one, I only have Starrett depth gauge & micrometers. I owned AZ English Rapids. Did the sizes switch when they came to Tennessee? Will they switch when Air Force changes tooling?
Last & simplest question for you machinist geniuses. What's the necessary instrumentation I'd need to precisely measure all glands, channels, all O-rings in most any PCP? They're distorted once they've been stretched over a part, put under 3K pressure. You can't measure those.
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Saylorsburg, PA, USA
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Sharp Shooter
Posts: 555
Dieseling is only good for a diesel engine...
Real Name: Antom
Re: Best O-ring Kits to buy for ANY PCP/pump
«
Reply #1 on:
January 26, 2019, 11:53:07 AM »
Yes we should have a database on forum only for O rings dimensions everything tied for this hobby.
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Umag Croatia EU
Common rail direct fuel injection works on 36,000 psi flawless thousands of working hours(20+ million strokes) . youtu.be/A5-P-jvXZgw
Why in the 21st century most manufacturers produce standard hammers for PCP, solenoid hammer + balanced valve has 100% efficiency and high precision in work where the trigger can be brought to perfection . Today, you can buy a good new smartphone for 50$ and new quality common rail fuel injector for 150$ . I hate them all for that...(I hope so Skout Epoch Airguns)
https://daystate.com/lock_time/
US2BZAirgunning
Shooter
Posts: 7
yes
Real Name: Ian
Re: Best O-ring Kits to buy for ANY PCP/pump
«
Reply #2 on:
June 03, 2020, 11:15:15 PM »
Yes, I am looking for a kit right now cause I have about 4 rifles down at the moment and I would like to buy a kit to fix them all. Looks like no-one commented on this to get us the information. Let's revive this topic!!
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Belize, C.A
nervoustrigger
GTA Senior Contributor
Posts: 8701
The Grin Reaper
Real Name: Jason
Re: Best O-ring Kits to buy for ANY PCP/pump
«
Reply #3 on:
June 04, 2020, 04:41:59 PM »
Well, O-ring selection is not so much a matter of being able to simply select and pay for the best, but picking the one that has the right balance of tradeoffs.
For the static O-rings, Viton (FKM abbreviation) is a good choice because it has an unlimited shelf life and is relatively inexpensive and easy to find. The downside is it swells so if you're doing disassembly/reassembly, you'll need to either have a replacement on hand or budget time for it to return to normal size (hours).
For dynamic O-rings, the two main things to consider in a high pressure pump are abrasion and heat. The position that sees especially rough duty is the innermost (final stage / high pressure) O-ring. For that one, I recommend either cast polyurethane (Disogrin polyurethane) or HNBR (hydrogenated Buna-N) in 90 durometer. Definitely 90 durometer...a hard compound is better in terms of both abrasion and extrusion resistance. Don't waste your time with 70 or less in this critical location. Cast polyurethane is tops in terms of abrasion and that's usually the reason I've had to replace mine. HNBR is excellent also but can be hard to find in 90 durometer.
For all the other dynamic O-rings like elsewhere in a pump, or the bolt or breech seal in a PCP, you can pretty well take your pick between the polyurethane (regular or cast), HNBR, or just plain old buna-N. The demands aren't that high so plain old Buna-N is my preference. Once again, preferably 90 durometer to minimize abrasion loss.
«
Last Edit: June 04, 2020, 05:02:37 PM by nervoustrigger
»
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Best O-ring Kits to buy for ANY PCP/pump