I had a problem this Spring with my AC-B where I changed the oil, gear lubes and stuff to get it ready for mowing. When I drained the oil, antifreeze led the way, then slightly contaminated oil. Not a lot, but clearly heavier than oil antifreeze led the way. DARN!!! It was extremely cold this Winter, and that little B sat in a corner of a barn. I drained the cooling system, filled it with new antifreeze. As recommended, I pulled the valve cover and checked the 3 freeze plugs in the head for small leaks, but they were solid. Did the valve lash while I was in there. Starting last year, I stopped using non-detergent oil and thought maybe I managed to flush some sludge out that was sealing??? I changed the oil and filter, ran it and used it to clean any possible contamination inside, drained and got rid of it. Put in new oil and use every weekend since doing an acre or couple around the house, draining it before each time...no antifreeze. No contamination.
What the heck. That antifreeze came from somewhere, but where? Because it sat from about November until March in a brutal Winter, something separated that has since swelled and sealed shut? Maybe because it sat for 4 or so months, contamination in the oil sat long enough that the weight of it caused it to separate and drain to the bottom of the crank case, forming back into a small amount of antifreeze? I can't figure it out. Unlike your case, mine appears to have...who knows, but not doing it anymore as far as I can tell. Maybe next Spring, after setting all Winter again...
As I look at your photos, the outside looks a little thin, and the inside looks pretty corroded. If I could see the inside of mine, I might say "Awe shoot", or worse.
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