Thank you for the helpful comments. I have it back together at the moment since I needed my tractor for some projects.
Even thought I'm fairly confident some of the connecting rods are backward, if I understood correctly I probably should check the oil spray holes because that will indicate for certain. But even so, it seems the consensus is that since it's run this long already it's probably not worth the work just to get everything aligned correctly. If, however, I have it apart someday then definitely make it right.
What is likely to suffer most from the reversed connecting rods? Wear inside the sleeves? What symptoms should I watch for in the comings years?
I like this tractor. Someday I hope to give it a half-decent restoration. In the meanwhile it's a working tool on my little farm. I don't put many hours on it each year--probably 2-4 each week during the growing season and less during the winter--but it is indispensable for certain tasks.
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