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Air in 582 cooling system

  • Dan L
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2 years 10 months ago #9939 by Dan L
Dan L created the topic: Air in 582 cooling system
Hi all,

I have recently installed a used 582 to replace the 532 that was on my Avid Flyer. I have had cooling problems since. The last several test runs of the engine on the ground with cowling off show it running fine and temps on the gauge are in the safe range but when I shut the engine down I get a long stream of air bubbles from the steam return line, in my case (inverted) from the water pump back to the coolant header tank/cap. I have tried carefully removing all air from the system when filling it. I have run it briefly with the cap off and topped off with coolant to make sure any extra trapped air could escape. I never had these issues with the 532 which was mounted the same and used the same radiator. I just changed the cylinder o-rings in the head in case I had a compression leak there into the water jacket but that made no difference. The rotary valve oil remains clean and at a constant level so no leaks there. There were no visible cracks in the cylinder head. Has the 582 ever had issues with cracks? I don't have any external leaks. Is there anything else that could be bringing air into my cooling system?

Any ideas would be greatly appreciated. I am grounded until I can figure this out.

Thanks,
Dan LaFon

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2 years 10 months ago #9947 by Alan Arnold
Alan Arnold replied the topic: Air in 582 cooling system
Hi Dan. When you fill the 582 with coolant you must do it with the engine level. Use a bubble level. After you have it full remove the coolant temperature sensor from the middle of the head. Air will flow out of this pocket. If there is no coolant moving upward out of the pocket add more coolant, slowly, until some does. All the air in this pocket must be removed. Replace the sensor and use thread sealant. I read all this in the installation manual years ago. The next two owners of my Kitfox both had cooling problems because they didn't read the manual I supplied with the sale.

Hope this works for you.

Alan

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2 years 10 months ago #9949 by Dan L
Dan L replied the topic: Air in 582 cooling system
Unfortunately, this 582 is mounted in an Avid which has the engine inverted. If I remove the temp sensor all coolant would run out. If it were not inverted all air should escape through the steam port at the top front of the head back to the coolant reservoir. My steam port is relocated to the port at the highest point of the water pump. I did level the airplane with a bucket under the tail wheel and did everything I could to remove air from the system before closing it up. Their is a substantial amount of air showing up in the system.

Thanks,
Dan

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