Remove the crankshaft

 The plan involved using the tapped holes either side of the crankshaft. I had some 100mm long bolts but found that applying the pressure required was just bending the bolts inwards.

So I swapped them out for the shortest I could find with large washers captured by nuts. This worked fine with no heat applied.

 The remaining crank case half leaves the crank and transmission bearings and the middle gear assembly. Normally I would not be tempted to remove this, besides the fact that it requires special tooling, however, there are bearings in there that have been supplied by the same sump oil so I am expecting that they all need replacing.