The boring job
Found a length of 1 11/16" 1144 shafting in the rack to build the boring bar. Since somebody borrowed my 1/4 square broach and didnt bring it back I went with a 3/8" round hole a d used an old 3/8 drill bit to make the cutter. Two bushing were made up for a good fit inside the outside main bearings and a nice slip fit on the bar. To set the cutter I laid a straight edge across the bushings, The cutter is .001 proud over the straight edge. Took 7 hours to make all this, then 2 minutes to bore the center main shells using a slow drill for power. The center main web in this engine is twisted a bit, guessing from when the crank broke. Luckily Lister stayed with a thick babbit bearing which left plenty to straighten out the mess. Next guy might scratch his head but he will figure it out,,, if hes any good. Last pic is the shaft and cutter next to the center main ready to work, my phone is taking lousy pics, sorry.