O ring visible between cylinder and valve.

[insomnia]

I bought second hand JJ which came with 2 diluent cylinders, valves and o rings. One of the cylinders got empty after few days, so I checked them and found there is a small gap between cylinder and valve exposing the o ring. Is that OK, or not? The gap is present on both cylinders and impossible to tighten more with hands.

The o ring pocket on the cylinder is 2.6-2.7mm. The o ring is 3.8-3.9mm thick.

Any recommendation on what to do? See two pics of lealing cylinder attached.

Thank you

 

[rjack321]

1) Torque valves to about 50ft/lbs or 67 Nm
2) Some gap is normal

 

[Matan]

some gap is normal - NOT seeing the O-ring.
Which manufacturer is the tank? I'm guessing Vítkovice


Matan.

 

[insomnia]

I have changed the o ring for 25x3,5mm and all is good. Seems I got bad spare o rings (24x3,8ish) from the seller.

 

[Capt Jim Wyatt]

seeing the o-ring extruded is not cool.

 

[mr_v]

That tank neck looks rough. I'd figure out how not to dive with that tank...

 

[NetG]

Change O Ring , standard oring is R19 (24.6 x 3.60) or AN19 ( 25 x 3;53) for the neck

 

[OTF]

Post pic of inside of tank

 

[insomnia]

Change O Ring , standard oring is R19 (24.6 x 3.60) or AN19 ( 25 x 3;53) for the neck

I changed that as mentioned in the post above.

Post pic of inside of tank

It is filled with the air now. I plan to send them for cleaning and pressure test. Most probably change them in the future or use them only for shallow air dives.

 

[desepas]

Check if the threads of the valve are compatible with those of the bottle