7.3 crank discolored?????

[blueknightcrew]

I'm changing my oil pan on my motor and saw some discoloring around the main and rod journals. Is this normal, what may it be from? Do they harden the journals or could it be from the machine process?? I took a main and rod caps off and they seem to be in great shape for 120k on them and don't seem to have been run without oil.

Thanks in advance for any info, Ron

[SCUFFY828]

its supposed to look like that , its part of the heat treating thats done when making the crank

[blueknightcrew]

thanks for the info. it just made me nervous when I saw it. Not having a diesel apart before.

thanks again, Ron

[greenie]

What was the color ?Was it Bluish ?

[blueknightcrew]

It was a blue in color I'll try to post some pics

[greenie]

From your pic's it looks good.I've had cranks that were deep blue with scratches of chrome across.If thats what you have its starving for oil.I didn't see that on yours,but you can tell if you lift a bearing.When Im down that far,I get the dremel out.
Your eyes will give you the experiance,good luck.Looks good so far.