corny sealing problem

[Deebee]

Help.
I have a second hand corny. It came with a passive vent valve which i changez to a normal manual release valve. Problem is it will not hold pressure.
I have changed all o rings a d sprayez the lid with soapy water after i pressurise it but a couple days later its empty for pressure.
I have greased the o ring and also hanged back to the original lid.
It seals ok but wont hold pressure.
Tips and help appreciated.

My next trick is to pressurise then sink in the bath..

[Dads_Ale]

Go with sink in bath. Found my leak this way.

[Andy]

What psi are you pressurising it to ?

[Deebee]

Pressurise to 40 psi. Know it is sealed as the lid stays in place without the locking handle being used.
Am just testing it to make sure its ok. Not wanting to risk destroying a brew.

[edonald774]

I've had this issue and it took me ages to find it.
Turned out it was the has sort leaking but I had to submerge the whole corny in the bath to find it.

[Deebee]

I think the problem is th3 lit. Opening looks weird. Might need to either add another o ring or pad the opening in some way.

[Andy]

Sounds like immersing in the bath when pressurised is the way to go.

[Deebee]

Sounds like immersing in the bath when pressurised is the way to go.

Found the leak sort of. Pressurised and submerged. Tiny pin hole bubbles coming from one spot where the rubber has lostened from the keg slightly.
Its about the level off the drop pipe for the gas in and on the gas side. Must be a pin hole in the metal.
Two choices i can see. Remove the rubber around here and look. Or.. spread epoxt round the whole area. Thougvts guys? 3ven though it was second hand i dont want to have to bin it.

[Fil]

Bummer, a pin hole in the keg is rare afaik.. rather than epoxy have you considered drilling a small hole you can seal with a small stainless steel nut/bolt/washer and if needed ptfe?

good luck either way..

[Deebee]

Cant ever see where the bloody hole is mate. Under the rubber. Would epoxy hold ?

[Kev888]

Superglue (and a patch) is good for reasonably rigid rubber, though unfortunately I'd suspect the leak could just find a way out elsewhere if its underneath the rubberwork.

I don't suppose you can see the spot from the inside, say with a mirror and a torch?
Or is there any chance at all that its originating from the base of the gas post?

Cheers
kev

[Deebee]

Superglue (and a patch) is good for reasonably rigid rubber, though unfortunately I'd suspect the leak could just find a way out elsewhere if its underneath the rubberwork.

I don't suppose you can see the spot from the inside, say with a mirror and a torch?
Or is there any chance at all that its originating from the base of the gas post?

Cheers
kev

Definately not the post.

Am going to take a small bit of rubber off then charge and spray it or submerge it. I dont thi k its far a2ay and neither is it large. No fluid leaks.
Dunno what else to do. Providing the hole is in the metal i can epoxt it. Maybe put a patch under the epoxy even?

[Kev888]

I guess it depends what you find, really. A small pinhole could be patched with JB-weld or similar , especially from the inside, or Fil's idea of a mechanical screw+nut could work too. But if its a split or a weld/seam parting then maybe not - I'd be cautious of pressurising a failing vessel with any repair short of a professional+tested weld.

Cheers
kev

[Deebee]

I guess it depends what you find, really. A small pinhole could be patched with JB-weld or similar , especially from the inside, or Fil's idea of a mechanical screw+nut could work too. But if its a split or a weld/seam parting then maybe not - I'd be cautious of pressurising a failing vessel with any repair short of a professional+tested weld.

Cheers
kev

The test pressure would be 20 bar. The max pressure 13 . Unless its a split the amount of pressure we use is minimal.

[Deebee]

Another ch3ck. You were right k3v. The leak is right at the base of the in post. These were replaced when i got the keg . Could be the o ring round where the post sits. Will take another post from another keg and see when i get chance.
Any other tios welcome. I dont have an oring. Any idea what size they are? Might be able to find one in a shop here.