Goose: I'll take a chance in adding that when I use Plastigauge on the mains, I will use a very small jack and a large wooden dowl or a 1X2 to push the crank up just enough to make sure it is against the top bearing. ( guess the weight of the crank) This helps put all the clearance into the reading you will get on measuring the bottom bearing. I also tend to "try" and look for the most wear area on the crank to measure. Might as well look for worst case clearance... I was told by several machine shop guys that worn mains have the most surface so renewing them might be enough.. I also seem to recall that if you have standard bearings, there are replacement bearings that are just .002 larger to save grinding a crank.. but all this info was learned decades ago so maybe there are no .002 larger mains sold any more..?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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