Thanks for the info guys!
I have managed to disassemble it all but the piston from the cylinder and the worm from the main case. I think patience will get those too! Had disassemble the crank with it still in the rear case. It stopped with the piston at about perfect timing position. I think it filled with water until it ran out the PTO flange. When it froze it broke the main case and the forward engine casting.
Been a challenge.