Is this rust or something else that needs to be polished off before reassembling? I think the crank shaft had some light marks on it too - not sure if something got on it that caused that like brake cleaner that was on the gloves maybe. Any suggestions for cleaning it off each part, if that’s necessary? Do I need to use WD40 to make sure nothing rusts?

 

Use a little scotchbrite pad on it and spray some WD40 on it and call it good. None of that is going to effect anything in the long run as it's not a bearing surface.

 

Thanks! I’ll do that on both the harmonic damper and the crankshaft.