If you want to check for combustion gas in your coolant, there is a test kit which will test for this. I wouldn't be too worried about cavitation erosion causing your problem. Its already been mentioned this would result in coolant in your oil pan. The old blocks were much more resistant to erosion. The later "10" series were not and fail routinely; poor metallurgy. It takes very little effort to maintain the pH of your coolant and it should be checked when you change your oil.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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