NDDan
Guest
I'm afraid the cooler wasn't the main problem. Copper sleeves leaking will cause presure in cooling system which will push excess water from overflow. If sleeves were leaking bad enough to end up with coolant in oil it would likely fill crown of piston and blow water from exhaust if able to crank over and get started. Any sign of scoring on bottom any sleeves. I'm afraid a cylinder sleeve oring would be your problem although you were not able to get it to show up. I've had trouble getting these leaks to show up just like you. Sometimes you let the pressure off and wait a day then pressureize again it will start spitting out the water. If you did not clean out push tube area and top of head ect. it will blow steam out for awhile.