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Guide to Mares regulators from 2000-2020

Discussion in 'Regulators' started by lowwall, Mar 16, 2020.

  1. Catito

    Catito Barracuda

    # of Dives: 50 - 99
    Location: Palm Beach County, Fl
    233
    193
    43
    o-ring in regulator. No charge.
     
  2. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    4,543
    5,694
    113
    Did they say which one, or can you find out?
    That's a diagnostic dilemma for those of us trying to figure out where a diaphragm design might leak. They should have a record of which o-ring was replaced.
     
  3. lowwall

    lowwall Manta Ray

    # of Dives: 200 - 499
    Location: Chicago
    1,024
    925
    113
    Oops. Good catch. The Rebel appeared in late 2004 or early 2005 and replaced both the budget Nikos and the lower midrange Axis. It's actually listed under "Axis Rebel Series" in Mares 2005/2006 Service Manual so it must have quite a few parts in common. An upgraded version was issued starting in 2006 called the Rebel 2K6 to provide "increased resistance to wear and improved performance in cold water conditions." This required replacing the reg body and a couple of other parts during a service.

    It looks like the Rebel was replaced in 2008 by the Rover. The Rover is based on the Prestige rather than being an updated or relabeled Rebel.
     
  4. Catito

    Catito Barracuda

    # of Dives: 50 - 99
    Location: Palm Beach County, Fl
    233
    193
    43
    I will ask. My guess on what happened is this...steel tanks using nitrox. O ring blows on tank while switching between dives. Crew puts o ring on—fatter than the nitrox o-ring. When I go to turn on tank right before I get up to jump in, the air rushes out my first stage. My guess is that somehow the wrong size o ring on the tank caused too much pressure to build which blew out the o ring on my regulator. Could that happen?
     
  5. Zef

    Zef Divemaster

    2,375
    1,795
    113
    Unlikely.
    You are describing the o-ring between your 1st stage and the face of the valve. If this does not form a proper seal then air rushes out between the 1st stage and the face of the valve (yoke regulator) or the valve opening (DIN regulator). If a proper seal is formed then air enters the 1st stage as normal.

    There is nothing about the o-ring at the valve/1st stage interface that would specifically cause an internal o-ring to blow.

    It could be that the o-ring at the valve/1st stage interface was not making a proper seal and the high pressure air rushing out seemed to come from behind the plastic cover as you indicated.

    If there was an internal o-ring that was compromised, it is unclear how that could happen and cause the rush of air out from the area you indicated without the diaphragm (or its position) being compromised as well...your description so far leads me to believe one of the following scenarios took place:

    1. Problem with o-ring at the 1st stage - valve interface and the rush of air seemed to be coming from an area different than where it actually was coming from.

    or

    2. Problem with an o-ring on the HP side of the 1st stage that caused air to leak past the diaphragm on the LP side...if this was the case then my bet is that the shop tech replaced the compromised o-ring, inspected the diaphragm, and tightened the retaining nut to ensure a proper seal between the retaining nut, the diaphragm, and the 1st stage body.

    or

    3. The retaining nut was somehow not tight enough and the air was leaking out from between the the retaining nut, diaphragm, and 1st stage body. In this case the shop tech most likely just tightened the retaining nut to create/improve the seal.

    Here is a picture of a torn-down MR15X with the parts laid out. You can see there are no o-rings on the LP side (circled in red) of the 1st stage other than on the port plugs.
    upload_2020-9-22_17-40-25.png

    -Z
     
    lowwall likes this.
  6. Joris Vd

    Joris Vd Nassau Grouper

    # of Dives: 100 - 199
    Location: Belgium
    120
    50
    28
    I use a 15x first with An ice kit. I get funny looks because I combine it with balanced adjustable seconds, but it's very stable, very little up swing and locks up super crisp and I've done + - 100 dives in water that's around 6-8 degrees C. No issues whatsoever and breathes like a charm.

    For sidemount I was considering the 82x because it does great in bench tests and general cold water reviews, but the angled hp ports threw me off.

    That's the thing with some Mares regulators: overall they seem very, very solid, but the small gimmicks they implement like the dual adj vane etc. make some people assume the entire reg must be a gimmick, which is not true at all.
    The 72 looks a bit gimmicky with the 8 lp ports, but if you don't permanently swap out your lp ports the chance of one leaking is tiny anyway.
     
    lowwall likes this.

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