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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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