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Synthetic grease for Scubapro 1st stage

Discussion in 'Vintage Diving & Equipment' started by boat sju, Jan 12, 2021.

  1. boat sju

    boat sju Contributor

    # of Dives: 200 - 499
    Location: Haslett, Michigan
    1,509
    395
    Thanks guys. I got a piston bullet and a few other tools from Herman last week. Apparently I'm going to have to wait until I get vaccinated to play with the regulator any more. Turns out it's an old Cressi and I need a BIG metric wrench to get it apart. I need to take it into Home Depot with me to find the right wrench.

    boat
     
  2. boat sju

    boat sju Contributor

    # of Dives: 200 - 499
    Location: Haslett, Michigan
    1,509
    395
    PXL_20210317_200035169.jpg

    So I cleaned the Cressi in an US, put new orings on the piston, and packed it with silicone without causing major damage. Seems tight. Good enough for filling car tires.

    Anyway, got brave enough to take apart my Mark 9. I was surprised to find this "shim" ? I don't remember seeing any pictures like this. Anyone care to fill me in if this was original or added later.

    edit: looked back through the threads. Pressurehead does have a similar picture.
     
  3. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,019
    3,871
    SP refers to that part as a bushing. When the MK10 Plus came out and SP was producing both version of the MK10 (Standard & Plus) they put all of the same parts & monkey motion into the Standard except: The piston, the seat retainer, and the seat. See attachment.
    A step backward IMHO.
     

    Attached Files:

    boat sju and rhwestfall like this.
  4. Pressurehead

    Pressurehead ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Queensland Australia
    592
    475
    Yes, mine is a Mk10 plus.
     
    couv likes this.
  5. rhwestfall

    rhwestfall Woof! ScubaBoard Sponsor

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    16,849
    20,258
    I just can't agree with packing..... unless only for fresh water, and even then.....

    Been diving the cold Great Lakes since 1993.....

    My only issue was due to high IP as a result of loo long until maintenance...
     
  6. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,019
    3,871
    Considering the "banana" yoke screw I see in the photo, I would say the piston you have there was a replacement for the piston your MK9 was born with. If you remove the bushing, you'll see grooves in the piston step that hold the bushing in place. This was not seen in earlier versions of the MK9/10.
     
  7. Pressurehead

    Pressurehead ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Queensland Australia
    592
    475
    Off topic sorry.
    Just curious, how high did the IP go ?
     
  8. boat sju

    boat sju Contributor

    # of Dives: 200 - 499
    Location: Haslett, Michigan
    1,509
    395
    Yeah, a local tech here replaced the piston for me 10 or so years ago. At the time I didn't understand why he said it was necessary and I don't remember him saying anything about the bushing. But back then I wasn't inclined to open the reg up myself. I bought the reg new in 1982 or 83 maybe.

    rhwestfall, if you dive the reg in saltwater there's no way to rinse the ambient air chamber out very well. That's why I'm going to repack it. Maybe there's something I'm missing here though. My reg does look pretty good inside.
     
  9. rhwestfall

    rhwestfall Woof! ScubaBoard Sponsor

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    16,849
    20,258
    Incomplete jobs result in pockets or voids that trap water and accelerate corrosion. Seen it too often. A good soak and a good flush Syringe for irrigating. Ambient chamber can be flushed...

    Major reason my regs are sourced from primarily freshwater...
     
  10. MedicMutt

    MedicMutt Registered

    # of Dives: 0 - 24
    Location: Louisiana
    11
    8

    And seeing a little void at one of the ambient holes in my freshly "Rebuilt" MK9 has me fretting taking it back out. Supposedly the guy that my LDS sent it to is the only certified SP tech around here. Now I'm not so sure I want my gear going back to him.

    I can access a syringe and Teflon catheter small enough to get in the holes and flush. Any other cleaning/care tips after I return from my salt water dive next weekend?
     

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