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Rotax 912UL coolant liquid

in 912 / 914 Technical Questions 8 years ago

  • Re: Rotax 912UL coolant liquid

    by » 6 years ago

    Hello, Sue,
    Welcome to the Forum.

    Undiluted Propolyene Glycol = Waterless Coolant = Evans NPG = Not Permitted!

    You may want to refer to this thread...
    https://www.rotax-owner.com/en/rotax-forum/3-4-stroke-technical-questions/6844-oil-temps-high-are-oil-coolers-required#20388

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Rotax 912UL coolant liquid

    by » 6 years ago

    Roger,
    So, which coolant does Rotax put in the 912 ULS out of the manufacturer? I am thoroughly confused at this time. My engine came with the "red". What do I use to top off when needed?
      
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  • Re: Rotax 912UL coolant liquid

    by » 6 years ago

    Rotax runs the engine at the factory on a test stand for about an hour before draining it and placing it in a shipping crate.
    The engine ships from the Rotax factory without any fluids in the engine. Dry!
    It will come with the Oil Tank and 4 Liters of Oil but without Oil Hoses or Oil Cooler.
    It will have the cylinder Heads plumbed to an expansion tank but will not come with a Radiator, Radiator hoses or Overflow Bottle.

    Rotax delivers the engine to the aircraft manufacturer wrapped in plastic and bolted in the box.


    It is the Manufacturer that selected the Radiator, Oil Cooler and all the hoses to plumb the installation.
    These parts are unique to each aircraft model and their selection is beyond the control of Rotax.
    The Manufacturer selected the Cooling Fluid.
    Most manufacturers follow Rotax's recommendations.
    Some do not.
    Whoever installed the engine in the airframe is who you should be asking about what "Red Fluid" you should use to TopOff.
    New912ULSinBox.jpg (You do not have access to download this file.)

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
    Report

  • Re: Rotax 912UL coolant liquid

    by » 6 years ago

    Just use Dexcool 50/50 and don't overthink all the different coolants. If you need to add if the reservoir goes down you can top off with distilled water.
    the water in the 50/50 mix does a better job absorbing heat and then releasing it as it cycles through the system and radiator.



    FYI:
    Red Coolant:
    APPLICATION Asian automotive and light duty vehicles requiring an OAT engine coolant.
    VEHICLE MAKES Lexus, Toyota, Scion
    FORMULATION Ethylene glycol based. Silicate, borate, nitrite and amine free
    PRODUCT COLOR Red
    SPECIFICATION/PERFORMANCE LEVEL ASTM D3306, JIS K2234
    RECOMMENDED CHANGE INTERVAL 150,000 miles* or 5 years of service protection
    COMPATIBILITY For best results, do not mix with conventional high pH, borate or silicate based coolants.
    PERFORMANCE FEATURE Aluminum Compatible
    PRODUCT OPTIONS Concentrate & 50/50 Pre-Diluted

    OAT = OAT is an acronym for Organic Acid (Additive) Technolog

    http://www.coolantexperts.com/coolant_overview/oat_coolant

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Rotax 912UL coolant liquid

    by » 6 years ago

    Thanks, that makes sense.
      
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