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582 high engine temp

in 2 Stroke Technical Questions 12 years ago
Hi all,

Have been having problems with my Rotax 582 for a month now. I am somewhat over the main fuel problems now after doing a rebuild of both carbies and replacing all fuel filters and flushing the lines, and replacing all fuel with fresh. The only thing I haven't done so far is the fuel pump, but before I pull this apart, I seek any help/ideas on what might be causing the following.

I took off in 85 deg OAT last evening and even before I climbed to 1000 feet the engine temp was 185 deg with the EGT's both within range. The left one 1100 and the right 1150. I tried to cool it down at low rpm but could not, so returned to land. The water levels were checked prior to flight.

Any advice welcomed.

Mike

  • Re: 582 high engine temp

    by » 12 years ago

    Mike,

    If the EGTs are normal, it's not a fuel problem. If your 582 is a bluehead, it could be a bad thermostat. You can heat the thermostat in a pot of water on the stove with a meat thermometer and see if it begins to open at the right temperature.

    Bill.
    Thank you said by: Michael Regan
      
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  • Re: 582 high engine temp

    by » 12 years ago

    Never thought of that... thanks bill. I am wondering now if I should try operating without the thermostat at all? Thats what we used to do to the old Ford years ago. I understand that this would of course take longer at warm up, but think the sacrifice might be worth it. Anyway I will try bills idea first, and if it proves it is working properly, I will leave it out, and if it shows faulty, I will replace it. As a matter of interest bill (or others) what would be your normal operating temp at OAT 85deg?


    mike
      
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  • Re: 582 high engine temp

    by » 12 years ago

    I just installed a new 582 Blue head in my airplane. I was running very high engine temps (185+ F.)and I tried everything to get it to run cooler. I did all of the checks for traped air bubble, checked the thermostate and replaced the radiator cap. Flushed the radiators. Nothing seemed to help until I read on the internet about the anti freeze mixture. I was running the recomended 50/50 mix in the engine. What you overlook is that the anti freeze is there to prevent the water from freezing not cooling the engine. I reduced the mixture to a 10% antifreeze and 90% water and that brought the cooling way down. It now runs at 150 to 160 F. If you don't have to worrie about your water freezing you might give it a try.
    Thank you said by: Michael Regan
      
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  • Re: 582 high engine temp

    by » 12 years ago

    George... very interesting. Where I live it never ever gets below freezing temp, so maybe I will try that too. I suppose I should empty and refill again, but I dread the time taken getting all the air locks out. Wish there was a way to stop this happening every time. I wonder if I just "trickle" the water in and see if that works. I do wonder though why rotax recommends 50/50. Will report back when I have the work done and the next flight completed. This could be a week or so though.
      
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  • Re: 582 high engine temp

    by » 12 years ago

    Not sure I would like to run an alloy engine on such a weak anti freeze mix....

    Dont forget one of its main jobs is to keep corrosion at bay...as well as being a coolant,

    I no expert on Rotax coolants but I would have thought its main job is just to transport unwanted heat to the rads and for them to dissipate the heat....and I think to Rotax spec type raises the boiling point,

    Running an engine to cool is a prob as well....as others have said and if it where me I would check out your thermostat....I take it the engine did used to run at normal temps....has the airflow to the rads been altered in anyway.

    Nick.
      
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