Aqualung Legend LX First Stage Failure at depth

[buddhasummer]

Conshelfs have a circlip to prevent the yoke from coming off, that little grove in the top of the threads.

Yes, I know, it was an attempt at humour, great design. I don't use those circlips either.

 

[claymore]

Conshelfs have a circlip to prevent the yoke from coming off, that little grove in the top of the threads.

The XII doesn't. It has a yoke and nut design.

 

[Magnus Lundstedt]

My comment on shifting the yoke wasn't really well written, hurrying out the door at the time. What I was thinking is that if you had the yoke screw slightly out of the dimple on the tank, or the screw walked out as it was tightened you could have the ACD open and not have a leak. Then a slight tug on a hose or a bump on the 1st stage like your head bumping as you looked up could slip the screw back into the dimple and allow the ACD to close. Too late to look now but maybe the tank valve had a groove or gouge at the yoke dimple.

If you get the reg to seal against the valve, the ACD is open. if the ACD is closed, you have a massive leak between the valve and trhe reg.

 

[Magnus Lundstedt]

I think you are right but I think the issue is that the yoke nut was loose and backed out enough to not push the ACD in sufficiently. That is in keeping with what the dive shop said. I think I posted my conclusion as you were posting this.

If the ACD is closed you have a massive leak between reg and valve.

 

[Magnus Lundstedt]

None at all, but no LDS that I know off will sell me Apeks service kits, unless I'm a certified tech.

We buy them from Germany.

 

[jd950]

I don't service my own regs, so I may be way off here, but I would think a loose yoke nut would be fairly obvious while attaching reg to tank. Is that right?

 

[gcarter]

I don't service my own regs, so I may be way off here, but I would think a loose yoke nut would be fairly obvious while attaching reg to tank. Is that right?

You would be correct.

 

[BoltSnap]

I don't service my own regs, so I may be way off here, but I would think a loose yoke nut would be fairly obvious while attaching reg to tank. Is that right?

It wasn't torqued to specs that doesn't mean that it was loose

 

[jd950]

It wasn't torqued to specs that doesn't mean that it was loose

Good point, but I would guess that not torqued to spec is a problem because it could then loosen too easily, and that is when the problem would appear. Is that right, or is there some failure likely simply due to the inadequate torque, without actual "looseness?"

 

[Umuntu]

We buy them from Germany.

I used to buy them from Germany. I recently switched to Scuba Support -- more reasonable prices and shipping charges.