| I would say so since its only a 3% difference. I do agree that multiple samples and measurement points would be useful for a more statistical conclusion. Given that the FSM only lists a 0.25mm oversized option, I'd guess that Nissan felt confident that the crank being turned that much is acceptable and doesn't impact reliability for the stock application. The visual morphology seems to support that in the images. The only concern I'd have is with sample prep. Mechanical cutting can cause a smearing of material over the cut region resulting in a deformed profile. I've been burned by this a number of time looking at electroplated films, but in those cases the materials were softer and thickness were <100nm. Also, how much does the press affect the profile distortion. If you want, I can toss a sample in the electron microscope at work and do an EDS profile measurement to map the nitrogen content. The nitrogen levels should be well above the equipment's detection resolution.
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