I'm new to these motors, but I understand the problems that the rod bearing can cause (my X440 has bits of metal in the oil - bad stuff). Anyway, my question: is there any influence of the hardness and/or heat treat of the crank pin? Is it the bearing elements that are failing or is it the crank pin from excessive loading? It would seem if it was the crank pin a harder/better yield strength pin wouldn't get chewed up even if it has higher pressure loading from fewer bearing elements. I'm sure this has been looked at before but I never found anything in my searches.
If the bearing elements themselves are failing it of course wouldn't make any difference.
Just curious...
crankshaft pin question
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