Our 656 (and probably its newer brothers thru 686) looks alot like that underneath as well. It would be interesting to know why it is that particular design and it was kept that way til the end. I had to get into the clutch housing a year ago because of a needle bearing on pto shaft failing. An insert also had to be machined to repair the casting for the bearing. I got way more familiar with the housing than I wanted. I seem to recall that while the cover in that shape provided good visibility, it really did not improve repair access--I believe the repair almost could be made if the casting was solid in that spot. Being you have the spare casting to play with, maybe you could check that out for me/us--see if you could reverse engineer the casting from the mold to final assembly without that hole. There has to be an original intended purpose for it, even if that idea never materialized in regular production.
As far as a standardized part almost fitting, that seems to be par for the course in agriculture and automotive until a standard is created and finally adopted (forced?). How many times have we encountered parts that almost fit or look the same until you measure or try to install? It sounds like the HD truck world seems to be the best standardized--how are construction and industry in that regard? Could you imagine a world where everything was standardized? You could bolt a SAE bellhousing deere powershift rear to an IH SAE bellhousing pattern engine or put a tractor engine in your chevy caprice. There are likely plenty of arguments for and against standardization but when "almost the same" is within an eighth of an inch the same you wonder why bother.
The parts diagrams for the 74 thru 84/85 series world tractors show a side/front pto assembly (i dont remember if it's for MFWD or implement PTO however). Once tenneco comes on board they changed that design... We should spend some time looking at euro/aussie case parts pages of similar designed models to the classic farmalls. I also remember when in elementary school looking at the school's deere and it had a pto shaft at the mid point either facing sideways or forward. So Ih is not the only front pto contender.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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