SOLVED! (Is my gun leaking or what? HELP!)
I cannot figure out if my gun is leaking or not, the second hole from the valve direction is giving out bubbles when soap-water is applied, but in 24h (bubbles still coming after second test) it has the exact same bar reading (as far as I can tell) but this is at 225bar. It has leaked before about 7bar in 10h or so. Maybe it only leaks properly at lower pressure? Should I take a few shots at the chrony and see if it starts out slow and then goes up to speed or vice versa? Or should I get it down to 150 bar or lower and do another 24h test?
I cannot figure out what the deal is with this gun, it came empty when it was shipped with air. It leaked before but now the manometer is showing the same after 24h?? I’m thinking it is to do with the high pressure… But the hole is still giving bubbles just as it did 24h ago????
Any help? 😳
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I think it would be okay Cricket, use a string with some of it on a give it a spin into the groove.
Check your progress as u polish, stop at it’s minimum …….
~ Greg
If the o-ring grooves have marks/scratches in them would it be ok to lightly polish them out with a tiny bit of autosol or is that a bad idea?
Yes ………..
~ Greg
Thanks Greg, I ordered 4 of those. So you mean the breather hole on the reg body should be facing 12 as in up towards the barrel? Not aligning it to the breather hole of the AT, then I think I am all set. Will come back with results when I have them
Yup, that’s the one I would change the high pressure side large O-ring, but if u like u could use A75 on both.
If u get a seal on the problem in the future u could use A75 on the other high pressure side the fill cap and on the lower pressure side back value cap also.
But do check the O-ring grooves for slight corrosion if any, clean as suggested ……. ….
When reinstalling it into the AT push it in very slowly with the breather hole on the reg position on the top at 12 o’clock to help retain the light lube job on the washer stack.
Good luck ~ Greg
Thanks guys!
I Hope this info will help. It has gone 40h now and it has dropped 5-6 bar. I just shot a mag through the chrony after the gun has been sitting for a few days, as I Said it has dropped in pressure since and no dry-fires or similar.
Shot with 18gr JSB
270
270
270
270
271
269
269
269
269
270
270
270
269
270
As you can see it did not start slow or fast it started at 270 mps and ended the mag with 270 mps. What does that say? Should I do the A75 mod or what?
Thanks again guys :thumb:
Hey Cricket,
It takes a lot of tiny bubbles and time to drop just 1 bar.
If u have a tester I’d change all the O-rings to A70 except the Large O-ring on the high pressure side I’d try and use A75.
http://www.theoringstore.com/index.php?main_page=product_info&cPath=368_65_66&products_id=2734
Use super lube for the inner 2 small O-rings and only coat the 2 large outer O-rings with MOLYKOTE-55.
Make sure the O-ring grooves don’t have any pitting in them from excessive moisture.
If so, use a string twin and friction polish it out with a little lube.
If u don’t have a tester I’d just change to the A75 Viton O-ring and test.
When just rebuilding a reg I like to top fill and let the O-ring make their seat overnight.
After shooting, top off after every shoot for a week or so.
Also when the leak is coming out of the hole your talking about (reg leak indicator hole) it could be any of the 4 O-rings that is leaking.
If your SD is high I’d suspect it’s the larger piston O-ring that is badly wormed out but not necessarily leaking.
If the larger piston O-ring actually leaks your reg would work and won’t regulate.
If you’re experiencing erratic crony number I’d suspect the small O-ring on the piston that is bad or leaking.
If your SD is good and just losing AT pressure it’s usually the large high pressure one shown above that’s the culprit !
Hope that helps yah ……… Greg
If the manometer is reading the same pressure despite the bubbles you are seeing, it could just be that a tiny bit of air is being released as that small cavity/space underneath the hole needs to equalize to the ambient pressure. The function of that “breather” hole is to prevent buildup of air within that area due to external/internal pressure changes and even a leak on the regulator. Otherwise the air buildup, especially when it becomes greater than the pressure in the regulated air chamber, would cause the regulator piston to unseat itself.
Are the escaping bubbles continuous and many? Is the manometer working? If there is indeed a leak, it’s just a matter of replacing the O-ring(s). There could be a microscopic gouge or cut on it.
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I can’t believe I missed this. When looking down the AT I can see a Long scratch that goes from about half an inch from where the edge that the reg sits on, to the threads och the valve… It ends by the valve in a “lump” of some sort.
what the hell is this??
It was very hard to get a good pic but I tried my best: