I've read conflicting information, some sites say this 312 should have a Kohler K301AQS, others say K301AS. Only difference is oil pan (apparently), and I've got a K301AS in this tractor.
When the motor was in the tractor, you couldn't make a full rotation of the crank before it would bind. Now I have confirmed why:
Upon initial inspection, I do not see any significant damage. The motor was still full of oil, no signs of heat damage, and no apparent cylinder wall scoring. If I were to guess, based on the nut that was lying in the pan, one of the connect rod cap nuts came loose and unthreaded. Deeper inspection and clean up will be required to determine if we can rebuild this one!
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