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Help with Mares MR12 IV / Navy 2nd stage

Discussion in 'Vintage Equipment Diving' started by mkaz, Mar 21, 2020.

  1. mkaz

    mkaz Garibaldi

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    While working on a Mares MR12 IV / Navy 2nd stage, I had to remove the by-pass tube to service the o-rin under it. The other of the by-pass tube that attaches to the mouthpiece channel did not have an o-ring.
    There only was some black, deteriorated stuff around the tube.
    The tube diameter is 8.8mm, the hole 9.0, leaving very little space and no o-ring groove. When test assembled there is no space at all between the tube protusion and the body. Everything is a tight fit but not airtight.
    Should this be assembled with glue or some kind of sealing compound? If yes, what kind?
    Anybody with experience with this particular reg?
    On later models, such as the XTR, the diagram shows a slightly different design and an o-ring. I tried fitting a very small o-ring but there is not enough space.
    Any help would be appreciated.

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