Aqualung Legend Lx Leak

[kombiguy]

Hi! My Legend second stage leaks. But only from the very end of the adjustment knob, and only when I inhale. Adjusting the knob either in or out makes no difference.
I went through it again, looking at the diagram, and I can't see anything I missed.
Any suggestions?

 

[redacted]

There should be at least a couple o-rings and a possibly cracked adjustment knob that would be my prime suspects.

 

[tbone1004]

or the o-ring that seals the end of the barrel. Do you do a negative pressure check on the regulator before you assemble? If it passes negative, then it's something in the barrel itself, but it is likely it is not going to pass a negative pressure and in that case it is likely the o-ring that seals the venturi adjustment lever

 

[kombiguy]

There should be at least a couple o-rings and a possibly cracked adjustment knob that would be my prime suspects.

O-rings are all there(I'm pretty sure) but I'll take another look tonight and I'll check the knob, too!

 

[kombiguy]

or the o-ring that seals the end of the barrel. Do you do a negative pressure check on the regulator before you assemble? If it passes negative, then it's something in the barrel itself, but it is likely it is not going to pass a negative pressure and in that case it is likely the o-ring that seals the venturi adjustment lever

Always. And I do a negative check before each dive, if we're thinking of the same thing. Well, I'll check those things tonight as well!

 

[redacted]

Missing o-rings are big leaks. Small defects tend to be small leaks. It helps to be very precise about the location of the leak to isolate the problem. Good luck.

 

[kombiguy]

Got it fixed. I used the wrong sized O-ring on a part. It was one size too big on the adjustment barrel. Works fine, now. Thanks!

 

[redacted]

Got it fixed. I used the wrong sized O-ring on a part. It was one size too big on the adjustment barrel. Works fine, now. Thanks!

Interesting. You can often get away with one size off, but not always.