[Hendrous]

Thanks for all that info,
I spent the morning dismantling the fans and marking all pipes and wiring plugs with masking taped notes so I can hopefully remember where it all goes when I get to the reassembly stage. Also running a video camera to remind myself where pipes and wires run.
It was a bit disconcerting hitting a snag when simply trying to disconnect the fan power connector. I snapped the lug of it and spent 15 minutes getting the little bugger apart. I figure if that gave me trouble I am in for some fun and games.
And yep I will go with your approach on the crankshaft bolt. What works on a utube clip may not in my garage and I could send a wrench through the radiator if it comes flying off.
What is the socket size btw? I measured it at 22mm but I'm not 100% on that as it is hard to get in there to size it up.
Thanks in advance.
Mark