OK, much better understanding of this now, thank you all. I can't find any dimensional detail of the shaft online, but reasonably assuming the 3.5mm radius of the bearing part listed is a perfect match to the interior corner of the shaft, then yeah the bearing should touch at a single tangent point against that surface rather than be a snug fit. It's hard to visualize exactly how extreme the difference is, and I'm not opening that wheel up without parts handy so I think I'll look into buying the readily available and reasonably priced 29680 to better understand exactly how pronounced that radius is.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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