You have boiled it down to lack of air in cylinders. If you had restricted fuel return it would not deliver excess fuel as the internals of pump equalize and the pumping plungers will not take on fuel. If you can verify no restrictions right up to the valves them selves with intake and exhaust manifolds off you can forget about that. Next thing would be valve lift and valve timing. You need to verify that the valve timing is correct following procedure in manual, I don't have it on that model. I did see one John Deere tractor that had absolutely no power, smoke was normal for a fully loaded engine and the problem was transmission was over filled about 10 galons, filling the wet clutch flywheel compartment and placed a heavy load on engine when speeded up. But, if you have heavy black smoke with a normal injection pump setting you are just not getting air. If pump is over fueled you could get heavy black smoke from some external load problem in transmission or hydraulics. Not that familiar with that model though.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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