Well, after a long time, I have actually got around to looking at this. Got the liner and piston out ok but cannot get the flywheel off. Is there a secret to this? The nut seems to have a groove around it, this isn't a locking nut is it? One problem is holding the flywheel while I turn the nut. I have tried holding it in a small vice between two bits of softwood but it slips round between these.

One other question, when replacing the liner, should it go back into the block dry or should anything be smeared on the outside before replacing it in the block?