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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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