Official Caterpillar3116/3126 Thread

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by carterchapman, Feb 12, 2021.

  1. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Boca_Vincent and Thomas Griffith like this.
  2. Thomas Griffith

    Thomas Griffith New Member

    25
    Jul 2, 2021
    Florida
    Boatless
    Boatless
    I have it. The one I have says it's for both. I will see if I can copy it, that's the only one I don't have doubles of.
     
    Steve S likes this.
  3. Thomas Griffith

    Thomas Griffith New Member

    25
    Jul 2, 2021
    Florida
    Boatless
    Boatless
    dtfeld likes this.
  4. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    If you get an account on https://parts.cat.com/en/catcorp, you can order all these plus about everything else you need, look up the parts on various systems, and ship it to your house.
     
    Thomas Griffith likes this.
  5. Njlarry

    Njlarry Active Member

    120
    May 9, 2021
    Chesapeake bay
    2000 400 DB
    Cat 3126
    Hi Dave. Great write up! Just two questions. Is the core tested in or out of the housing? Do you have simular article on the aftercooler?
     
  6. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    I did not test the core. I pulled the cores out and descaled in Rydlyme and did a visual inspection. I couldn't find any corrosion or other signs of deterioration, so I reassembled back into the powder coated shells, and reassembled onto the engine.

    I did check the entire coolant loop with a pressure test rig I borrowed from Advanced Auto Parts. I forget the psi, but it held, and I concluded no further work/testing was required.

    I have not dealt with the aftercoolers, but they are on my list. Ryan did his last winter so he may chime in on that subject.
     
    carterchapman likes this.
  7. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    the aftercoolers are pretty straightforward. The core does not come out, the shell was welded around the core so it’s all one piece. There are a bunch of small fasteners, I think they’re 8mm and 22 of them, that hold the AC to the intake. You want to unclamp the boost hose from the turbo, slide it down and off the AC flange, loosen the hose clamps that hold the cooling water hoses in/out, then remove the fasteners. It won’t really drop down as it’s supported by the turbo but I held it up as I removed it. It’s pretty heavy, so be ready for it. The port side is worse that starboard because you don’t have as much leverage to lift and have to kneel on the engine.

    call your local cat dealer and ask them who they recommend. A local shop to me is who they used, so I did too. They boiled them, cleaned as much as possible, and pressure tested. You’ll have to repaint them afterwards. The only additional part you need is the aftercooler gasket for reinstall.
     
  8. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    And replace that hose section between the turbocharger and cooler using the CAT part with new constant tension hose clamps. Make sure that hose installs dry and oil free with baby butt clean surfaces. 3126 are raw water cooled so there are probably broken pieces of the zinc's inside so a long soak in barnacle buster will dissolve. 3116 are cooled with the engine coolant...
     
    Strecker25 and carterchapman like this.
  9. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    Ah yes I forgot about that. I did the boost hose and also the stubby sections coolant hose for the in/out of sea water. I also did all the other hoses on the engine at the same time since access was a little better.
     

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