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Rough inhalation SP balanced/adjustable

Discussion in 'Repairing your own Gear' started by halocline, Sep 21, 2020.

  1. halocline

    halocline Solo Diver

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    I had an interesting experience last week in Mexico during a sidemount cave dive. One of my B/As started to inhale unevenly; there would be an initial sticking, then a rush of air, intermittently. Not every time, and it would frequently start well into the dive. In sidemount you're switching regs frequently, so I really noticed it. It never got bad enough to call the dive.

    I was able to figure it out after that day of diving, and got it mostly fixed for the next day. It was not what I expected. (Those are clues) I thought it would be fun to post it here and see if anyone wants to take a whack at diagnosing it. I bet someone will know right away!
     
    couv and rsingler like this.
  2. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

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    During the initial phase when it was "sticking", did you have to suck harder? Or did it breathe easily, but just minimal air flow?
     
  3. cerich

    cerich ScubaBoard Supporter ScubaBoard Supporter

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    Lp seat sticking to oriface, lever issue, possibly a balance chamber issue
     
  4. Open Ocean Diver

    Open Ocean Diver ScubaBoard Supporter ScubaBoard Supporter

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    Lever feet sticking/catching in the barrel?
     
  5. couv

    couv Instructor, Scuba

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    The problem is that the diaphragm is starting to decay and get a little sticky, especially when its a bit dirty and wet. It was probably slightly sticking to the rubber purge cover until enough vacuum pulled it away.

    It's either that, or the twit who tuned it last did not go to the AWAP school of regulator maintenance. :-D
     
  6. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

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    Since folks are jumping in, and you say it was "mostly fixed" the next day...
    1) since you're @halocline, I'll guess it WASN'T a catching lever. You would have filed the lever square hole on restoring the reg, so
    2) a grain of sand stuck between the poppet shaft and balance chamber, as @cerich suggested. It's "mostly fixed" because there's still another tiny grain stuck in the lube that's still catching the oring occasionally.

    That's my story, and I'm stickin' to it! :cowboy:
     
  7. couv

    couv Instructor, Scuba

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    Shotgun troubleshooting. Not allowed! (except when actually working on a regulator.)
     
    Open Ocean Diver likes this.
  8. halocline

    halocline Solo Diver

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  9. couv

    couv Instructor, Scuba

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    I guess that means none of us nailed it.
     
  10. axxel57

    axxel57 Solo Diver

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    The exhaust valve was not evenly positioned on the spider or slightly damaged, so it took a certain amount of vacuum to close it and initiate the inhale flow.......
     

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