Crankshaft Discoloration

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
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DeeZX
Posts: 35
Joined: Sun Jul 06, 2008 1:46 am
Car: 90' 300ZX Twin Turbo, 90' 300ZX NA, 91' 300ZX 2+2

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I took my engine out to change my dented oil pan only to discover heat discoloration on some sections of my crankshaft :frown: . I don't know how bad it is. I've posted some pictures for the experts in this forum to give me an idea on what I should do.

Should I replace the crankshaft and bearings
Don't worry about it, it's not too bad
rebuild the engine and get cryogenic treatment for the crank
get another used engine
or something else

Photos below:

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