I’m in this same boat with this same motor. Tried heat and tapping. Will try the 8″ puller (currently in the mail).
If your flywheel is really stuck you can pull the
center down and completely through the
flywheel, if you decided to keep going, using a
3 jaw puller pulling from the outer edge .
Watch my video.
You must make this tool.
If you don’t have a welder you can just jam the
2 nuts together. How hard you need to hit the
tool and how many times is determined by how
tight the flywheel is on there. Just tapping on it
won’t separate them. You must hold the flywheel
up at the top of the crankshafts end play.
If it doesn’t pop loose right away stop and check
the tool to be sure it remains tight.
Tubs.
Video- https://youtu.be/RWgE9XiIBnk?si=B8KTDSjRoeEuXIMa
. .
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.