841 Powermaster. I started my tractor this morning and it was running rough with white/blue exhaust (first time I saw that). I was standing on the carb side of the tractor and looked under it to see something dripping. When I went to the other side of the tractor, it was blowing oil out of the filler cap all over the side of the engine. I shut it down immediately.
I recently did a complete tune up and removed the distributor to set timing, but I have used the tractor several times since completing that so don't think they are related.
I have never seen this before. I need some suggestions about possible causes and how I should go about problem resolution.