I have disassembled a couple of F12 engines and have had the same thing happen to me. What happens is that many years of use wear the gear to the point that a little burr is raised along the edge of the teeth, this makes the gear just enough bigger to scrape the bearing when you remove the camshaft. Grind or file off that burr and it will go back in without scraping the bearing.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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