When I took my 1GM10 out last winter I unbolted the mounts from the boat rather than struggle with the locking nuts. I can't visualize a way to replace the mounts one at a time without lifting the engine.
In my opinion, it will be necessary to re-align the engine/shaft couplings no matter what.
To that end, I found the only reasonable access was to remove the water tank and the plywood panel between it and the engine so I could work from the cockpit locker. (The rental yard was out of leprechauns with headlamps.)
That still meant climbing in and out when the front mounts needed a twist. A two person team would be optimum.
The good side benefit was being able to really scrub and hose out the water tank and nasty fill pipe.
Give the shaft bolts a WD-40 or PB blaster dose every week for a month before you try to move them.
But maybe the thing to keep in mind here is that the little bugger will shake like crazy after all that work anyway.
Bob
