Should I replace heat exchangers on Caterpillar 4126?

Discussion in 'Sport Yachts/Yachts' started by merlin, Oct 5, 2017.

  1. merlin

    merlin Member

    83
    Jun 17, 2010
    san francisco,ca/Marina del Ray, Ca
    "Volare", a 2003 Sundancer 410, with original Raymarine electronics.
    2, 350 hp, Cat 3126's
    My 41 sun dancer is 14 years old with 400 hours on the engines. I've owned her for 6 years, I am the third owner. To my knowledge the heat exchangers have never been replaced. My local Cat dealer says they should be replaced every 6 years. What say you all?
    Also, my slip has an awful starboard wind, which drives me crazy when I dock even though I have a bow thruster. What about a stern thruster? Are they effective? Many thanks.
     
  2. hottoddie

    hottoddie Member

    812
    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Cat sells parts so what does that tell you? Do you do your work at all? Can you remove them and have them inspected and pressure tested by a radiator shop? Of course if money is no option and you want piece of mind have new ones installed and sell the take offs on ebay for half the price of new one.
     
  3. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    My 3116's are 20+ years old and I have never even considered replacing the heat exchangers, but……..I use nothing but Caterpillar ELC (Extended Life Coolant), I change it at or before the recommended interval (5 years) and I keep the system clean. I am in warm salt water and I descale the cooling system every 5 years.
     
  4. ttmott

    ttmott Well-Known Member GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2000 Sundancer 400DA
    Cat 3116TA
    Are you sure they said replace the heat exchanger or replace the engine coolant for the heat exchanger? I checked the Cat maintenance schedule and it says nothing about replacing the heat exchanger. They are not a maintenance replacement item. The exchangers on my 3116 cats are original like Frank's. If you take care of them they should last near the life of the engine.
     
  5. merlin

    merlin Member

    83
    Jun 17, 2010
    san francisco,ca/Marina del Ray, Ca
    "Volare", a 2003 Sundancer 410, with original Raymarine electronics.
    2, 350 hp, Cat 3126's
    Thank you all for your advice on the heat exchangers. I went back through my records and learned that I descaled them 4 years ago. That should be enough for now I think.
     

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