How do you know if a crank needs to be turned?
#2
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Any evidence of wear-scratches etc on the crank or rod journals. Turning is milling these surfaces down, smaller journal diameter, to a correct clearance with bearings for proper oil pressure. Basically a good smooth surface for the bearing surface. You turn the crank down then put larger/thicker bearings in.
Hope that makes sense
Hope that makes sense
#4
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What Ky and bluecajun said + using micrometers to actually mic the diameter and compare with factory specs and tolerance. Basically on most late models if it is a smooth surface without scratches that you can really catch a finger nail on you are most likely ok.
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