First, I would change out the oil. Depending on how long it was constantly running, the oil could have certainly starting boiling as it exceeded its maximum temperature.

I would drain it and add a good synthetic compressor oil or partial synthetic compressor oil. These oils (at the link below) operate in a broader temperature range than standard compressor oils.

www.mastertoolrepair.com/synthetic-synth...essor-oil-p-733.html

In regards to the Flywheel removal, it's much easier if you take a propane torch to the flywheel hub for a few minutes. Once it has expanded, it should certainly be easier to remove. You're on the right track....take your bearing pullers (to the back of the hub, not the fins!) with an impact wrench and try to remove it. This is the best method to use; if it still doesn't want to budge, add more heat and try again. I hope this helps.

- MTR