When seal retainer is dismantled: Check with a dial indicator if there is a runout on the sealing surface. It could happen if the crank has been ground on the mains and not properly centered. The sealing surface is normally too narrow to be ground with the crank grinding wheel. So, it depends on the quality and aligning done by the machinist. If this is the case it will not help whatever you do, other than take the crank out, and have it corrected. My