100-4 Crankshaft nut size

[mike brooks <hypercubic@yahoo.co.uk>]

Sounds like a daft question but if someone knows what size spanner (wrench) I 
need for the 100 crankshaft nut I would be most grateful. It's not easy to get 
at in a single lockup garage with no hoist etc.  And I don't have anything big 
enough to try. I can see it's about 2".

Thanks

Mike