RE: os 55 ax connecting rod problem
Actually, there isn't a "lot of people" with the problem. We just don't see seized rods with this engine. I'd like to see the posts you mention.
When a connecting rod lets go like that, it usually means that the rod's lower end seized to the crankshaft. That happens when there's not enough lubrication. The lower-end seizes and twists off as the crank tries to turn.
We'd need to see the entire engine in order to make any kind of determinations.