Ya, that started the FIRST crack lol.. Someone just did a pipe tap on it,and put a pipe bung in it..Looks like a 3/8 18tpi. Ugh.. cracked the plug boss...
But, after further inspection, I find evidence of a broken tensioner and a chain that got jammed between the floor of the case and the clutch basket. That is the "other" crack, the one thats actually leaking worse lol..
Yeah, I had a green valley moment and forgot about the chain drive sprocket WTH?!?! I was tired.. Luckily, I never pry anything very much, if it don't go, look at it again, and again, and again.
Sometimes its better to get another pair of eyes or just go get a sandwich and come back to it rather than hammer or pry on anything that is worth more than a years salary lol..
I have a manual, but, after looking at it I probably won't use it much except for torque values and clearances. I read through it, got my "Oh you dummy" and pretty much have the thing memorized now as far as assy. and teardown.
But, ya, a bit of a DUH moment. Sad thing is I work on all sorts of machinery in my day job, everything from avionics to cnc controls to automated equipment. I should know better.