Crankshaft turning- needed or no

[Aleroguy757]

I'm asking this for future reference, when I go to install an LX9 top swap on my car.

I know I don't have a spun bearing, but when I do dig into the engine, I was considering re-ringing the motor and replacing the bearings, just to be sure.
My questions are these. If there is no scoring, is it needed? And if there is minor scoring, does the crank need to be turned, or can I use an emory cloth or something else to polish it up?
I've seen pics of bad scoring, and if its that bad, I know it needs to be turned.

 

[Kool1]

The answer from my memory is if you can feel the scratch or score with your fingernail, you need to turn the crank.

 

[Aleroguy757]

Anything less than a fingernail catching it doesn't need turning? Except maybe a little cleanup?

If I drop the pan and see it needs to be turned, I may just get another one.

 

[Trav]

It is preferable not to grind a crank unless it is absolutely necessary.
This is a decent article and should give you some direction.

http://www.autoserviceprofessional.com/article/92691/Inspecting-crankshafts?Page=1

 

[A_Harman]

I say polish the crank if you replace the bearings even if you can't catch your fingernail on a scratch in a journal.

 

[paulo57509]

Measure the journal diameters. Typically, there should be service limits listed in the service manual.