Engine oil in coolant? Ford 420 Industrial

1977 Ford 420 Industrial tractor

I have REALLY dirty antifreeze, or engine oil in my antifreeze.
It appears to be oil in the antifreeze to me.
How's this possible?
BUT I DO NOT have antifreeze / water in my engine oil.

I drained the coolant and flushed the radiator and block till the water was clear. That took forever before the water was clear.
Filled it with distilled water and Mac's / NAPA cleaner which is clear.
Ran it for 3 hours and same thing: water / coolant no longer clear. It was really dirty / oily.
No change in engine oil level.
Still no water in engine oil.

What's going on?
Am I doing any damage?
Can I keep running it as long as I'm not getting coolant in the engine oil?

Thanks in advance!
 
Probably a leaking/blown head gasket, allowing combustion byproducts into the coolant. It will get worse, not better... I'd fix it if it were mine.
 
Those engines are known to have cavitation problems. Not only do they perforate from the water jacket into the cylinders but they can also perforate from the water jacket into the oil galley. 60 psi oil pressure could easily push oil into a 12 psi cooling system.
I would first make darned sure it's in fact oil in the coolant. Then I would start thinking about dropping the pan and devise a way to pressurize the oil systems with air. Try to locate the leak somehow. I'm thinking at this point pulling the head isn't the direction you want to go.
I will be interested in following other ideas here so please keep us updated with your findings.
 
I was fixing to ask if the radiator had a hydrAULIC cooler...

And did he check the radiator for blowing bubbles by filling it to the neck with water and then watching for bubbles comming out... if bubbles, blown headgasket or pinholed.
 

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