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 Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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