cooant leak

I was wondering if anyone has experienced a coolant leak into the crankcase from the valve cover to crankcase oil return passage. This is on a G John Deere. Likely a pin hole from the water jacket into the return passage. A repair is no going to be easy. Would appreciate any help.
 
You could go to a good auto supply and ask about a good sealer that would plug the hole. I had a truck that picked up a pin hole in freeze plug on back side of the engine that you couldn't get to with out doing a lot of work. NAPA sold me a sealer that worked and I kept the truck for another 6 years after that and it never leaked again as long as I owened it.
 

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