Agreeing upon terminology is necessary for a technical discussion. The bearings in the photos are just worn, not "spun". A "spun bearing" has worn off all the babbit and copper, but the driver ignored the noise while steel shell has gotten so hot it locks upon the crankshaft journal and turns inside the rod or main cap. Often this destroys the crankshaft; the journal will be blued from the heat.
Yes, the above is definitely best practice.
No, not CASO practice, as more than one here is saying to himself, "I just dropped the pan, put in new bearings and drove it another 10,000 miles before I sold that car; still running last time I saw it."
Maybe, evaluate each situation and decide upon what is necessary for the intended application and budget.
jack vines
If the bearings are down to the copper like mine were, then the crankshaft will need to be turned and the entire engine disassembled and cleaned to remove all traces of the bearing material. This would also include new camshaft bearings.
No, not CASO practice, as more than one here is saying to himself, "I just dropped the pan, put in new bearings and drove it another 10,000 miles before I sold that car; still running last time I saw it."
Maybe, evaluate each situation and decide upon what is necessary for the intended application and budget.
jack vines
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