Right, the non reprint (of course the information should be the same) Ford Tractor Shop Manual for 1955-1960 600-900 & 601-1801 tractors says to use whats in the engine crankcase. Starts on page 415, these are seemingly the best books for these, also has S-0-S (early ones) information.
I'll have to try the heavier 15W-40 Rotella, than was called for back then, make sure I don't overfill, and see after running if its coming out again. However, I just found the air cleaner in the parts manual, NO cork gasket, I'll check toi see if one is stuck on the top section. The whole engine on this tractor gets lightly coated, then the trash from mowing dry weeds and what have you clings, turns into a thick coating, but it does not use oil, nor leak engine oil when sitting. It does leak coolant, which seems to be a porosity issue with the block, no head gasket, overheating or similar problems,just comes out the left side, going to add Barr's to it, be great to stop this leak, but maybe the coolant is enough to make things stick and coat the entire engine, I have cleaned it with compressed air, seems to come back.
Old tractors sure are fun, start out fixing one thing, 3 others show up, was getting ready to put it all back together, was fooling with the stiff throttle lever and the #10 screw I modified for a pivot head finally sheared, been in there for years, made another, sure is hard to get those tiny hex nuts back on, took apart the pivot behind the breather, looks like some sort of friction material, so I cleaned that, (but did not lube) and the mate to it where the linkage connects, adjusted seems to be much better.
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