line boring reasons?
The diameter of the mains, measure in the center in the oil groove and thus the least worn part of the journal, are: #2 1.606 #3 1.598 #4 1.591 #5 1.597 #6 1.604 Since I have no specs on the original diameters we don’t know when to stop grinding and start welding. He thinks it will take .030″ to clean it up. The rod journals appear to have been ground once as I have seen a trade article that says the original diameter was 1.625″ and most of them read 1.613″. The worst was #6 at 1.605 and, at 90 degrees from the first measurement, 1.600″. He is of the school that says babbitt should be as thin as possible and so is concerned about the thickness of the babbitt insert bearings, now at .135″ and how thick they can be before a brass backing should be made and babbitt laid into it. I wouldn’t think .015″ more would matter.
