Repair of crankshaft, page 1

Then you want to change the main bearing, or the big end bearing in the rod, you have to use this special tools to drag of the inner ring  of the main bearing.

Then you use this tool.

Then you pres crankshaft apart, using 2 hardened steel plate, and 2 pieces  5,0 mm. steel under the front of the crankshaft, and preferable a tap there is 19,5 mm and have a tap fitting the hole in piston pin.  

Control the fiber, if you have seized the big end bearing or the main bearing, will the fiber be damage, you have to take the old one out and replace it with a new one, and pres it in as on the photo, secure the screw with loctite.