The crankshaft isn't working right.
The crankshaft is a very important component in the motor and is balanced very precisely. If the crankshaft were to lose its balance for some reason, major engine damage would occur. This would also cause all of the main and journal bearing to be scored, or even spun. A crank walk is also another possible crankshaft issue which is where the crankshaft moves parallel in relation with the block and causes the same type of issues. I would recommend having a certified mechanic diagnose your crankshaft issue.
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