High Temps - Closed Cooling System Ateriosclerosis...

Discussion in 'General Maintenance/Repair Questions' started by BAYOU_PILOT, Jan 13, 2019.

  1. BAYOU_PILOT

    BAYOU_PILOT New Member

    20
    Oct 9, 2017
    Miami, Fl
    2004 Sundancer 340
    8.1S Mercruisers...
    V-Drives...
    Hi Everyone,

    I've experienced unusual high temperatures over the normal lower rpm regimes for this engines (it is between idle and 2000 rpm) making a lot of trips trying to figure out what could happened...

    In the meantime, I've made a complete service of 500 hs> coolant levels were normal, no leaks, changed impeller, Oil, filters, sparks, fuel water separator, etc.

    When the engine reaches 3000 rpm +, it starts slowly increasing temp till alarm rings...

    Once opened to check the thermostat and so, we found this...

    Never Use a wrong coolant... a3be1277-dc98-44bb-8200-dcb73bfda713.jpg e95d75b8-6ec0-48af-a884-6b36d3c36d4c.jpg d534a951-cc60-4a57-8e50-8646335c8d86.jpg 7f45e87c-f2b9-4725-a6cf-f11e2eaf9ba1.jpg

    Now we're in cleaning process, we'll keep in touch...

    L.
     
  2. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Yep, someone didn’t stick with Dexcool.
     
    BAYOU_PILOT likes this.
  3. Saverio

    Saverio Active Member

    Aug 31, 2010
    Long island new york
    1995 330 DA
    Twin 454 Webber Carbs
    V drives
    Fresh water cooled
    cant mix them....

    unless it has the pink stuff in there from winterizing
     
    BAYOU_PILOT likes this.
  4. BAYOU_PILOT

    BAYOU_PILOT New Member

    20
    Oct 9, 2017
    Miami, Fl
    2004 Sundancer 340
    8.1S Mercruisers...
    V-Drives...
    probably was a mix, with a wrong coolant (I can guess brand due to its colour...:()

    and maybe no winterizing since the boat born and actually lives in south Florida.

    I'm still waiting the cleaning process to reassemble and try it..
     
  5. dwna1a

    dwna1a Well-Known Member PLATINUM Sponsor

    Apr 23, 2012
    James River
    88 Weekender 300 "Seahorse"
    Twins 350
    Bayou my daughters ex mixed coolent in her car. It took several flushes to get the jelly out. They even tore the engine down and washed it out. It will take more than once to clean it all out and it will need to be done often. We now do hers every oil change.

    Good luck with the motor
     
    BAYOU_PILOT likes this.
  6. Bwardz50

    Bwardz50 New Member

    15
    Jul 3, 2018
    Lutz, FL
    2006 340 Sundancer
    2005 Mastercraft X2
    8.1 Mercruiser Horizons with V-Drives
    MCX 350 Indmar with V-Drive
    BAYOU_PILOT likes this.
  7. BAYOU_PILOT

    BAYOU_PILOT New Member

    20
    Oct 9, 2017
    Miami, Fl
    2004 Sundancer 340
    8.1S Mercruisers...
    V-Drives...
    Hi Brian, Yes, in fact it seems to be the same problem.

    After trials on tuesday evening, everything is normal. Crossover was cleaned, Heat Exchanger too. And of course the hoses as well.

    I drain the engine to make a fresh water flush, but in this case it was not necessary. Engine was clean and the jelly concentration was on those two parts.

    We noted that pink "jelly" sticked on the crossover started to eat its aluminium... probably due to wrong coolant incompatibility used with this material.

    Many Thanks for the support !

    L.- nxr4BppBQd+V6Wvd%KpmCg.jpg xyJq1G+1RgaTCLWuW+M1bg.jpg CmsjnwQSRPCM82QDvKK7bA.jpg 1ANu2rzrQIezyB3E2xf2MQ.jpg fk2QvfkHS%mZnbdEVig%mQ.jpg FX0D9uNkTQCEEDrEQ68IHw.jpg 5sn1Z14wSL6XNL1lRsx9Tw.jpg
     
    Last edited: Jan 18, 2019 at 8:36 AM
    strange weather likes this.
  8. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Well done on the clean up.
     

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