There should be a serial number on the ID pad , but if it's not a world block then it is probably a Cummins recon built , canada , motor , PM member zippy with the serial number , he works for MP tech , and he should be able to tell you when it was built. Ifit is a Cummins Recon engine they had a number of issues that needed to be adddressed , the heads are a sore spot , retainers too small for the springs , valves with too short a margin, valve guide clearance all over the place.

I'll have to look at the crank from my engine , if it still has a knurl then the fix is a ROPE SEAL ...