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Oliver 550 Overheating

I

icesweeper

Member
Recently overhauled gas 550, all new main bearings, rings, head planed, etc. Included flushing radiator and new thermostat. Tried mowing, overheats after 15 min or so, not working motor excessively. Pulled thermostat, pan test, starts to open ~158, fully open 163 or so. When overheats, goes into red on gauge, and blows coolant out. Belt is new. Happens every time we try, ~ 5x so far, one time after gauge exceeded the midline in the work zone, parked in shade and let idle, kept climbing until into red and coolant release.

Overhaul was due to excessive oil consumption, not heat issue, never ran hot before.

Ideas? Have heard air bubble possible, how do you burp it? Or other causes?

Thanks for the help, the grass is getting ahead of me!!!
 
Sorry, should have included this- Could this be a fuel issue, a little ethanol was added to tank, maybe 2 gal out of the 10 we filled with. Could see it running a little hotter, but not this much hotter.
 
I would suggest double checking ignition timing, if the timing is too far advanced it can cause issues with heating. Also does it start easy or does it kick back, that might indicate advanced timing. Also does it stop running when you turn off the key, if not that might indicate advanced timing.
Another thought, radiators do loose the cooling ability over time, this is generally caused by the fins not being in good contact with the tubes. I do not know a way to fix this other than a new or recored radiator.
 
Heard back from mechanic friend, wrong thermostat, something about no bypass in housing, didn't have time to discuss fully, new part due in early next week, will post results. Thanks.
 
Check the thermostat and make sure it is installed correctly. Make sure the spring part of the thermostat faces the head. flat side faces the radiator.
 
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