The symptoms of a 3 bearing crank failure?

[fatcatvera]

So with the kind help of Arthur from the MA7C I now have what I hope is a usable replacement 3 bearing crank - for a start it rings nicely compared to another that didn't (thanks also to Robert Leigh for the offer of cranks/short engines). I've also crack detected this crank it along it's whole length with dye penetrant - see results below. No obvious linear cracks around the centre main webs where it seems the 3 bearing cranks typically fail.

Big end journals are measuring around 1.2935/1.2950" (with a vernier - which is the best I have for the moment) - 19thou / 17.5thou u/s.

Centre main measures 1.7085" (again with a vernier) - 41.5thou u/s.

Plan is to give the bearing areas a bit of a polish and see how they look, measure them more accurately with a vernier for size & ovality, then decide whether to get the crank ground. I have an existing set of 30thou u/s big ends that suited the failed crank that are in very good condition. Existing c/m is 40thou as well and in usable condition so could re-use that too if plastigauge tells me the clearance is ok.

I'd prefer to save the crank at it's current bearing sizes if I can to extend it's life as much as possible.

Then I also have the challenge of trying to check the c/m is in line with the end mains and do something about it if I need to...