Too much oil past worn oil rings will "torch" cut the exhaust valves too. I had a MF 85 gas that I burned an exhaust valve while trying the tractor out on the PTO dyno. Ran fine under light load, but when under full load it started hissing at the exhaust. When engine was apart the oil rings were shot. Same thing happened to a neighbors IH 560, it had a miss on two cylinders that a tune up would not correct. Compression check, and just listening to the exhaust confirmed exhaust leaks. Pulled the head, replaced all exhaust seats and valves and touched up the intakes. I noticed more oil than normal on the two cylinders that had the burned valves, and wanted to replace all sleeves and pistons while the head was off. Owner said no, oil use is not that bad. Put the repaired head on, and in less than ten hours the SAME two exhaust valves were torched again..
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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