An oil drain hole was left out of the crankcases, that would direct condensed oil to the critical PTO bearings. If you look down on the upper crankcase, you will see 3 oil drain holes when there should have been 4. The blockout for the mag side piston has 2 drain holes that direct oil to bearing on each side of the rod for that piston. On the PTO side, you only see one hole. The outer hole is missing because it needs to be drilled at a somewhat radical angle that is not possible with assembly line construction. So next time you have your crankcase halves apart, you might want to drill that hole in from the top, at the same position as the other holes, and direct it outward towards a location that will get oil to the PTO bearing. And the engine will last longer before the PTO bearing blows.
