Don't really know what problem you are having with the 806, but, after IH spare parts supply of original part number pump for 806, the replacement pump was same as 856. Only real difference (improvements are always made along the way on most any part) is the automatic advance. The 806 was 7 degrees and 856 was 10 degrees so IH recommended setting static timing to 6 degrees btdc instead of 8 when putting a new pump onto an 806. I think I am remembering all this correct as I am not looking in the book.
If you have a little white smoke at high idle your advance probably is not advancing correctly or static timing is late. Fuel pressure operates the advance and raises with engine speed so that has to be correct first of all. But, like I said, don't know your actual problem but you mentioned white smoke.
Fuel setting is very close to same and most are set beyond specs anyway.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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