Low Oil Pressure

[Ron]

...might be the pic/me, but it looks like one place is smooth, yet blue (heat).

If you don't have the micrometers to actually measure the journals then just get your parts to a machine shop. They should know what to do and how to do it. IMHO the damage is the RESULT of the low oil pressure, not the cause.

+1

Thanks Ron, nothing like this on the flange and counterweights. There some numbers and letters though.
I checked the documentation. Standard size is 70.062mm, which currently it is. Regrind should be 69.762mm, 0,3mm under. So we will take 0,25mm main bearings but they will do it with the crankshaft and the block to the exact measurements of the oversize bearings.
There is big marking "R" still visible on one of the counterweights.
Will replace the bearing with the SKF, too (made in China currently installed).

Only the high spots are 70.062mm.
I would wait until it goes to the machine shop before ordering the bearings, 0,30mm might not clean it up.
No idea what the "R" is for...