The bearing with the lock gone has spun in this motor before while the other one hasnt . This would be normal if this wasnt the same bearing in the same journal .
Most people dont realize you can change the top and the bottom bearing with out pulling the crank . Looks like to me this motor spun the center main bearing so someone dropped the cradle and replaced the bottom side with out replacing the top side . This is why one half the bearing has the lock gone and the other side doesnt . Who ever did this didnt do it thinking they fixed the problem but rather did it in order to sell the car with out replacing the motor.
