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Crank Pin Bushing In the Lister types
there are a few in our DIYer group that do run long hours off grid with the 6/1 and 12/2 Lister type CS engines. Jack Belk was the first to show us a bearing with a very distinct wear pattern, this is only seen on the top shell. The first thing you should note is you will often learn nothing by removing the bottom shell in a typical 6/1 engine. Since the oil feed holes are in the top shell, that is often the only place you will find evidence of sand or foreign material contamination. The sand will often embed into this top shell, and you should see the pattern following rotation and you might see evidence of where the spread of these foreign materials spread from depending on the design of our bearing shell, and the size of the particle. The lesson, "if you do not have time to pull the top shell, don't even bother looking, the bottom one will often look new out of the box when the top one is looking VERY bad". I will leave a spot here for Jack's Pictures of his bearing shells.. <> I'll add them soon as possible
Below is pictures of John Ferguson's bearing pulled after many hours of running,
Ferguson's Top Shell 10,000 hours what I note is the erosion is not following the direction of rotation, but looks more to be related to loading. I do not pretend to know, but could this be related to a failure of the lubrication? Could it be caused by a less than round journal? There will likely be folks out there that have seen this pattern and have soem ideas as to what causes it, please consider dropping me a line with your thoughts. All the Best
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