Lister DK Remove Crank bearings/Shaft.

Hi Folks. At the Moment i'm restoring a Lister DK for my Nephew, I want to replace the Crank Shaft Bearings as they sounds very rough. How do you removing the Shaft from the bearings. There is a nut on the shaft I tried to remove this but it wouldn't move, and i even put heat on the nut but still no joy. Is there a Pin that goes through the nut to the shaft, to keep the Nut from undoing.
Looking forward from your feedback. Thankyou.

I found out the Method to Remove Crank Shaft and Bearings. Renewed Bearings and Fitted back together.
No Replys on this specially on a popular engine. Which I find surpricing.

sorry Andrew...
haven't been on her for a few days....

sorry mate,glad you have sorted the problem...

regards...mike....