I need to order a new set of main bearings, and am trying to find the markings. Nissan says they are on the top of the block, but those markings don't seem to match up with what Nissan is expecting. On the top of my block it reads:
232222
MRRPF

And on the crank it reads:
SKRLS
111111
ARG

Does anyone know how to read these marking?

 

use those numbers to cross match to a bearing size off of the chart in the service manual

 

The problem is that there are 4 main bearings and 5 numbers/letter on the block (MRRPF) and 3 numbers/letters on the crank (ARG). How do you cross-reference it? Thanks for any help.