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Guys, the failure does not occur if the bearings get worn a bit, and copper shows... it's normal. The problem occurs when they "spin" , which happens when they wear so much at the top where the little notches are, that keep them into place... then they move and spin around the crank and cause a lot of debris to enter the engine and damage the crank also... wear at that middle point is normal.
Of course if other components pollute the oil and debris gets around between crank and bearing, it will cause failure also.
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