Shell insert bearings are made slightly thicker in the middle, thinner on the ends, and higher than the parting line to produce a pre-engineered amount of "crush" when the cap is torqued down. This crush is part of the insert design and causes a slight bore distortion which produces a carefully engineered ecdentric bore along the thrust line and a wedge shape in the clearance area to promote formation of the oil film. To do it "right" you need to grind the ends of the insert down by the thickness of the shim in order to maintain that "crush". You also need to grind a small relief on the ends of the bearing parting line to prevent the crush from raisng a ridge in the bore.
In other words a lot of careful engineering goes into the bearing geometry - it's not as simple as it looks on the surface and that's why shimming is no longer done.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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