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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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