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VDH DSV Leak by

Discussion in 'Vintage Equipment Diving' started by EberWolf, Apr 27, 2020.

  1. EberWolf

    EberWolf Angel Fish

    # of Dives: 0 - 24
    Location: Kingdom of Bahrain
    21
    13
    3
    I can't post this on the VDH site right now. My work network doesn't like their site.

    I received my Kraken DHR in December last year. I've been able to get 6 dives on it so far, all within the last month and a half. I noticed at the end of my 6th dive when I closed the mouthpiece on the surface air was still bubbling out slightly while I was on my back. I'm 6 dives new to the DHR, never having had one in the past. What should I be looking for as a possible cause?
     
    couv likes this.
  2. lexvil

    lexvil ScubaBoard Sponsor ScubaBoard Sponsor

    # of Dives: 1,000 - 2,499
    Location: jamestown, ca.
    2,622
    2,237
    113
    You probably need to take it apart and look at the o-rings, try lubing everything if it looks good or order a service kit, you should have received one with the Kraken but if not you should keep one on hand.
     
  3. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    625
    596
    93
    First step is to plug in an IP gauge and check the IP is steady at ~135psi not climbing at rest (indicating a leaking HP seat), which will eventually over-pressurise and vent via your octo and try to get past the DSV if it is in the shut position.
    If IP is OK then as @lexvil says try re-lubing the existing o-rings.
    If it still leaks try softer 50 Duro o-rings which will conform a bit better, -028 for the inner barrel and mouthpiece port, -027 for the wagon wheels.
     
  4. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    625
    596
    93
    Here's an exploded view I prepared earlier... idle hands being the Devil's Workshop :D

    Updated to include mouthpiece o-ring...
    DSV Exploded 9.jpg
     
    JamesBon92007 and couv like this.
  5. EberWolf

    EberWolf Angel Fish

    # of Dives: 0 - 24
    Location: Kingdom of Bahrain
    21
    13
    3
    Thanks for the Pic. If you ever watched Futurama you'd know The Devils Hands are Idle Playthings.

    How easy is it to take apart and reassemble?
     
  6. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    625
    596
    93
    Dead simple to disassemble, just remove the large black nylon screw and the inner barrel assembly will slide out from the RHS.
    The wagon wheels can usually be popped out by carefully poking a soft wooden chopstick down the mouthpiece aperture and pushing on the edges of the wheel till you can grasp it with your fingers. The o-rings can then be changed.
    Make sure the wagon wheels and inlet/exhaust valves are oriented as in the diagram.

    The trickiest part on reassembly is to ensure the o-ring around the mouthpiece aperture doesn't get cut or dislodged when you replace the barrel assembly. Use a slight twisting motion as you press it in and it should pop straight in.
     
  7. EberWolf

    EberWolf Angel Fish

    # of Dives: 0 - 24
    Location: Kingdom of Bahrain
    21
    13
    3
    I ordered a DSV repair kit but it might take a few weeks to months to get here. Can I use off the shelf gaskets? Size?
     
  8. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    5,287
    2,799
    113
    Nice diagram, but un-idle your hands and add the o-ring that goes around the square part of the mouthpiece opening.

    @EberWolf here is a vid you may find helpful:
     
    Fibonacci, rhwestfall and happy-diver like this.
  9. herman

    herman Divemaster

    # of Dives: 500 - 999
    Location: Raleigh,North Carolina
    9,580
    2,229
    113
    Before going too far, can you better define "when I closed the mouthpiece on the surface air was still bubbling out slightly while I was on my back." Was air coming out the DSV or was air coming out the exhaust on the cans? If air was coming from the DSV, then service of it might be in order. If there was air leaking from the second stage and coming out the exhaust in the cans. that is a completely different matter and not related to the DSV.
     
  10. EberWolf

    EberWolf Angel Fish

    # of Dives: 0 - 24
    Location: Kingdom of Bahrain
    21
    13
    3
    Air was bubbling from the mouthpiece.
     

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