3126 cat maintenance schedule

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by Almightys, Jun 18, 2020.

  1. Almightys

    Almightys Member

    219
    Jun 15, 2015
    Warren, MI
    (SOLD)1992 Sundancer 330, 7.4l's w vdrives, and genny
    454 Mercs
    I am looking at a boat with 3126 Cats. The broker mentioned the hours were higher on this one 2500 approx.
    I asked about maintenance records which he says are there but will verify when I go see the boat this weekend. Was posting here to get opinions on what services should have been done with this many hours?

    It got me thinking as I always see a lot of maintenance questions posted here but I never noticed anyone post up a maintenance schedule for these engines.
     
  2. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy
    3126 Cat's
    techmitch likes this.
  3. Almightys

    Almightys Member

    219
    Jun 15, 2015
    Warren, MI
    (SOLD)1992 Sundancer 330, 7.4l's w vdrives, and genny
    454 Mercs
    Thank you for this!
     
    The Bill Collector likes this.
  4. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives
    CATs are great engines and I think you'll find a lot of fans on this site. For the most part, these engines just require the fluids, filters and impellers to be changed on schedule as outlined in the manual Mark posted. Almost all of it can be easily accomplished DIY. Parts are easy to access and reasonably priced from your local CAT dealer.

    There is one procedure that requires a CAT tech or at least someone with the right tools and know how to accomplish, that being the Valve lash and injector timing. This should have been accomplished at around 250 hours and again at 2000 hours. I would ensure this has been accomplished or make some arrangement/accommodation with the current owner as this is an expensive service.
     
  5. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    The hours doesn't bother me from a longevity stand point but it does mean that the service records and history of the owner having done the recommended maintenance on time is really important.

    The other regular maintenance item that will have been done more than once is checking and cleaning the aftercoolers.

    The service records should indicate what type of oil was used. If the previous owner has been using multiviscositty oil, then the after coolers should be cleaned as a condition of the sale.

    It is critical th at the engine coolant has been replaced or the SCA's replenished in it at least every 5 years.

    Tides shaft seals are usually well past their useful life at 1000 hours.

    The seawater hoses from the seacocks to the strainer should have been replaced by now as should the sea water pumps.

    If the broker hands you a file boat full of receipt and calls that a service record, then prepare for several days of home work to reconstruct the service record to determine when what was done.

    Good luck.........
     
    dtfeld, JC3 and carterchapman like this.
  6. Almightys

    Almightys Member

    219
    Jun 15, 2015
    Warren, MI
    (SOLD)1992 Sundancer 330, 7.4l's w vdrives, and genny
    454 Mercs
    Thanks for all the info. Looks like I’m in a different direction of an animal
    As the boat I put an offer on has Detroit’s 6v92’s
    As always a wealth of info here and appreciate everyone sharing their first hand knowledge
     
  7. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    So you asked about 3126's, but it has 6V92's?...I's confused...
     
    The Bill Collector likes this.
  8. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Hey, look at this way, you could be in his shoes and being misled.
     
  9. Almightys

    Almightys Member

    219
    Jun 15, 2015
    Warren, MI
    (SOLD)1992 Sundancer 330, 7.4l's w vdrives, and genny
    454 Mercs
    1st boat had 3126, but we lost the deal on that one. 2nd boat which offer did get accepted, has 6v92TAs and is pending survey and inspection
     
  10. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    Ahhhh....sorry, I'm slow!!
     
  11. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives

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