Casting bearings on the job was one of the necessary repair methods stationary, marine, mining and railroad engineers had to perform as regular maintenance for engines and turbines.
It should be possible to find bearing surface pairs from auto and machinery supply stores of the proper size. If they are a little too thick they can be scraped or bored to the proper thickness. This means that some auto rebuild shops may be able to do the job.
Another method was to take a lead plate of the proper width rolled to the thickness equal to space between the body and the shaft (without the bearing in it) and bend it into the space, then tighten the shaft into the body til it took the shape of the space. then the bearing was wiped to the right clearance spacing using bearing indicator (a blue wax-like thin rod that spread to a certain thickness depending upon the clearance) from the auto part suppliers.
Another method was to place ceramic mold clay around one side of the shaft/body assembly after the surface was coated with separation wax. The formed clay was cut with a knife to make the mold separate into two places. The assembly was taken apart. the bearing removed, then reassembled. A pipe of the same diameter substituted for the shaft. Two 1/8 inch slices of the old bearing served to center the shaft at the separation in the center of the body set on its side. With the clay on the bottom, hot wax was poured into the space between the shaft and the body. The resulting cooled wax was a lost wax mold to be mounted into a casting mold, heated to lose the wax, then bearing lead poured into the mold space to make a bearing. The bearing pieces were placed into the body to be scraped to the necessary clearance.