Air in 582 cooling system
in 2 Stroke Technical Questions
10 years ago
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
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
