Reply to Norm R2,22:
Thanks Ed for the info. I have the 7U27570 to 7U44307 parts book. It doesn't show that end of the engine and doesn't even list that part number. I'm sure it is on the engine but they evidently figured I didn't need that info. I hope a rust hole in that will be the reason for all the engine oil in the oil clutch compartment. I hope all the clutch components will come out the top and the flywheel is marked, I may mark it anyway. I don't relish kneeling over and "Standing on my head" for the entire job. But, if that is what it will take, that is what I'll be doing.
Hi Norm ,
another thing to check, if you have not done so, is that the Diesel engine breather is scrupulously clean.
If it is clogged with dirt/dust up in the hard to get at end of the filter medium it causes any engine blow by pressure to build up in the crankcase and push engine oil out the rear main screw type seal.
This is not a positive seal and so if you run front end high or too high oil can run back into the flywheel/clutch housing also.
Rust hole in the plug is also a possibility as you suggest.
Cheers,
Eddie B.