If he is using a caliper, he could be measuring too much. Allow another .005 for that, and another one or two thousandths for the caliper slipping when it's pulled away to read it, and another .001 for the limit of the accuracy of the caliper, and it COULD turn out that he's actually measuring a perfectly good pin that's been turned to .020 under.
I've taken measurements like that early on in a project just for the purpose of sizing up what might need to be done, but the final measurements that lead to a decision are made with the crank out. As far as the crank pins, I could be comfortable with measurements taken on some cranks with the motor on a stand and upside down, so that everything is in reach and lighted well and room to move the mic, but if he thinks he's got issues with wear, then the mains need checking, too, and the only way to do that right is to pull the motor and get the crank out.
I'm a little vague (memory--the second thing to go) but I seem to recall that any crank I ever had turned, the shop stamped right into the crank somewhere either the new measurements or how much they had turned it down.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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