One thing you can be sure of - it is from the cooling system!
There are only a few places, in any engine, at which coolant can leak into the oil.
It could be a head gasket; a cracked or porous casting - head or block; a low pressure oil cooler through the rad; failed liner O ring seals; core plug leaking; push rod tubes; cracked or porous liner. Might be one or two others I have forgotten and not all are appropriate to this tractor.
The most likely failure on this tractor is the O ring liner seals.
Seems like pan off, and pressurise the cooling system if necessary, to spot the source of the leak. Hope it is a core plug in the head, if they are present. If they are, only removal of the rocker cover, not the sump, would be the easier starting point.
Engine bearings may well need to be checked out anyway, as antifreeze in the oil soon destroys them.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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