Pete, I see 2 options ,one would be to polish it in a lathe or with a crankshaft polisher until it cleans up as seals will tolerate some size change as long as it is true round.Hand polishing may make it lumpy .The other option is what cnks mentioned and is metal spray (also called spray weld or metalizing )and doing this will give you a new seal surface without heating the shaft and doing harm to the heat treatment. Metal spray only needs 200 deg min and no more than 500 deg to work ,therefore no damage to the heat teatment. Welding or brazing in this case is not a good option.
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