Official Caterpillar3116/3126 Thread

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

  1. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    Ok, this makes sense, and helps. I am glad I asked. The "flow" of fuel makes more sense now as well.
     
  2. Njlarry

    Njlarry Active Member

    403
    May 9, 2021
    Chesapeake bay
    2000 400 DB
    Cat 3126
    Would if be helpful to fill the secondary filter through the outside circle of holes so the fuel is filtered going into the center? Then only little to no need to purge with the yellow plunger pump?
     
    dtfeld likes this.
  3. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Yes. I think there was a thread about this a long time ago.
     
  4. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    That adept ape channel on YouTube talked about it too he puts a red plug in the center and fills it through the holes
     
    mrsrobinson likes this.
  5. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    The best way to fill the secondary filter is to pour the clean fuel into the filter thru any orifice it will go in, wait until the fuel soaks into the filter media then do it again and again and again until the filter is full and the filter media will accept no more fuel in either the center or perimeter holes. The idea is to be sure you are filling the filter with fuel and not injecting any air into the process. Do it this way and it won't matter where you pour the fuel as long as it going in the filter.
     
  6. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    What did you use to clean them with?
     
  7. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's
    My hp is 420...
     
  8. Maybe A Dancer

    Maybe A Dancer Became a Dancer 12/23/21 GOLD Sponsor

    474
    Aug 20, 2021
    Florida West Coast
    Started out as MAYBE A DANCER
    Became a Dancer - 12/23/21
    450 DA Sundancer running CAT 3126
    CAT 3126

    Removed both:

    • heat exchangers - for service
    • fuel coolers - for service
    • transmission coolers - for replacement
    • Aftercooler to be removed & serviced by CAT- not me
    Please confirm the obvious - I can't find the oil cooler because it doesn't exist

    Right?

    BEST!

    RWS
     
  9. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    correct
     
    Maybe A Dancer likes this.
  10. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    I didn't know these engines had fuel coolers
     
  11. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    yep, tube looking cooler right before the raw water pump inlet. It’s the last stop for fuel before it heads back to the tank
     
    mrsrobinson likes this.
  12. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Yes there is an oil cooler on the 3116 / 3126 engines. It is on the side of the engine block behind the turbocharger mounted in the engine cooling jacket.
    The only time it ever needs servicing is to clean gunked up engine coolant off of it.
     
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  13. Maybe A Dancer

    Maybe A Dancer Became a Dancer 12/23/21 GOLD Sponsor

    474
    Aug 20, 2021
    Florida West Coast
    Started out as MAYBE A DANCER
    Became a Dancer - 12/23/21
    450 DA Sundancer running CAT 3126
    >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    Thanks for that info Tom.

    Prior to removing the coolers I flushed the engines with fresh water, then ran her out on the Harbor with the CAT descale solution.

    Drained it hot and flushed the engines with fresh water again.

    The cooling systems on this boat were neglected.

    Is this a solid plan?

    RWS
     
    Last edited: May 2, 2022
    dtfeld likes this.
  14. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    I think you are solid. The only caution is if you observed corrosion in the cooling system. Then I would pull and take a look at the cooler. The last thing one needs is coolant contamination in the oil. Regardless, your oil analysis that should be done every oil change looks for coolant.
     
    mrsrobinson likes this.
  15. Maybe A Dancer

    Maybe A Dancer Became a Dancer 12/23/21 GOLD Sponsor

    474
    Aug 20, 2021
    Florida West Coast
    Started out as MAYBE A DANCER
    Became a Dancer - 12/23/21
    450 DA Sundancer running CAT 3126
    Tom,

    Boat was a California DOCK QUEEN - only 435 hours on her at time of survey

    She passed the CAT engine survey, CAT oil samples and CAT blow-by tests

    CAT COOLANT ANALYSIS

    PORT:
    CODE RED
    MODERATE AMOUNT OF FINE BROWN NON-MAGNETIC DEBRIS DETECTED. SAMPLE IS OPAGUE. CLOUDINESS MAYBE THE RESULT OF PARTIALLY DISPERSED INSOLUBLE CONTAMINANTS. NITRITE LEVEL (INHIBITOR) IS SLIGHTLY BELOW THE LOWER LIMIT. INSPECT FOR SOURCE OF DEBRIS. WE RECOMMEND TO RECOMMEND THAT YOU SCHEDULE UNIT FOR COOLANT CHANGE. DRAIN COOLANT, FLUSH SYSTEM 3-4 TIMES WITH WATER, REFILL WITH NEW COOLANT.


    STBD:
    CODE YELLOW
    TRACE OF FINE BROWN NON-MAGNETIC DEBRIS DETECTED. SAMPLE IS CLOUDY. CLOUDINESS MAYBE THE RESULT OF PARTIALLY DISPERSED INSOLUBLE CONTAMINANTS. NITRITE LEVEL (INHIBITOR) IS SLIGHTLY BELOW THE LOWER LIMIT. INSPECT FOR SOURCE OF DEBRIS. ADD 1 QUART OF SCA (CAT P/N 3P2044) PER 10 GALLONS OF COOLING SYSTEM CAPACITY TO BOOST NITRITE LEVEL. RESAMPLE AT THE NEXT ENGINE SERVICE TO MONITOR.


    The only reason STBD came back better was freeze plug at bottom of turbo rusted out. Tech likely added some fresh coolant (and epoxied in the freeze plug) some time prior to purchase.

    Likely BOTH samples would have come back looking like the Port side had the turbo not been repaired.

    As far as the oil cooler is concerned, given that oil pressure (when running) is higher than coolant pressure if there was a breach it seems it would be oil into the water......... correct?

    As I did with the Yanmars in my 10 Meter, I plan on doing oil samples with every oil change.

    Perhaps I should consider doing them every X hours in between changes?

    After the coolers are done CAT will service the AFTERCOOLER and set the injectors & timing overheads.

    In the process, I'm also replacing all of the 25 year old hoses.

    RWS
     
    dtfeld likes this.
  16. Riptide III

    Riptide III Well-Known Member

    987
    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    :
    5863CBFA-85AE-4912-B11D-A930A0DF1E8B.jpeg 29FCE00D-7F16-405A-8303-D7DD0036DA71.jpeg I have changed/replaced the alternators on both my engines. Now my friend needs me to do his. I know this is a basic question, however, I don’t have the guards on my alternators and he does. Can I slip the alternators out without removing the guards. I know it will become apparent once the job begins. It would be nice to know ahead of time.
     
  17. SEAWOLF

    SEAWOLF Member SILVER Sponsor

    69
    Nov 15, 2020
    NJ
    1998 Sea Ray 370 Amberjack EC
    CAT 3126 - 420 HP
    Hi All . I have Cat 3126 what transmission oil do you use ? Thank you
     
  18. Riptide III

    Riptide III Well-Known Member

    987
    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    :
  19. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    The list shows a lot of things that are foreign or aren’t locally available. If you call ZF, they will tell you about any Dexron III will work.

    I use Mobile Delvac 1 Synthetic ATF as it specifically listed in the ZF Spec, and relatively easy to find. Takes about 2 gallons each, 4 total. Might be a little overkill but they are 20 years old…

    3ED3B6FB-4E52-4946-A927-3B3C6C3A3730.jpeg
     
  20. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    What is the CAT descale solution? This is new to me.

    I have always shied away from radiator cleaners in cars for fear they will corrode/break something in the internals and/or break something loose that does not flush out. Is this a concern for these 3126s?
     
    Last edited: May 3, 2022

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