Quote:
Originally Posted by torsionbar
x2, induction hardening usually leaves a very subtle bluing on the crankshaft, while this coloring seems far more pronounced. Also the fact that the rod caps show the same bluing. I've never heard of induction hardening of rod caps. Crank yes, rod caps no.
IMO this engine was run without oil, which caused this heat discoloration.
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I'd check out Google images using the search term "OM603 crankshaft". You'll turn up tons of images of cranks that look exactly like the one shown.
This and the fact that there aren't any other symptoms of bearing failure seems to suggest that the coloration came from a manufacturing process.