ironhoarder: Don't run it, don't even start it up until you get to bottom of problem. I don't know that 806 was ever prone to this problem, but the smaller 706 could break sleeves around the top. It would start off as a minor knock, that was the warning to shut it down.
The minor knock was sleeve moving up and down in the block, next move was piston sucking sleeve down with it, now the problem occurs when piston comes back up, things jamb up a bit when piston comes up.
I had this happen with my 560 with 282 diesel, same engine as 706. Tractor was on blower at silo, a young lad was changing wagons, 560 still running. He heard the knock, rather than shut it down he ran for help. When he got back with help, there were parts of two pistons plus parts of block scattered across the barnyard. KNOCKS are a warning, don't ignor them.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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