Blue streaks on connecting rod journal

[atlbusa]

I was told that the blue marks on the connecting rod journals are no big deal but figured I would get a second opinion. They are small and just behind the oil port like a bluing trail behind the port. No damage or anything just a little discoloring, goes around just a bit then stops it doesnt continue around the whole journal.

 

[Mr Brown]

Blueing of metal indicates heat. At very least I would have it mic'd.

 

[atlbusa]

Blueing of metal indicates heat. At very least I would have it mic'd.

Like I said no damage, and it measures out good, just doesnt look right to me. And realize it is heat induced, just wondering if anyone (Jay (ape) ???) has seen this on many others and thoughts on it.

 

[atlbusa]

And to be clear, the Mark's are very faint, barely noticeable, not like bluing like I have seen on spun bearing, more like a faint shading trail by the oil journal

 

[Mr Brown]

Explain it however you like, metal doesn't turn coiors, especially blue, on its own. Just because you can't see damage doesn't mean there isn't any, which is why I suggested micing it. You asked for a second option on it, there's mine.