Toyota Repair: rod bearings, rod bearings, crankshaft

Question
I had just recently bought a 91 Tercel. Car had sat for awhile and engine had been reworked, supposedly. Anyways, car had a pinging sound and it would increase as acceleration did. I checked the rod bearings and had replaced one. After work was done took it out and it ran real good. After about 5 miles started pinging again. Tore into bearings again and noticed that all bearings had some sort of scoring on them. Had been told crank needs to be turned now after the work I had done. Motor still accelerates real well. Am I looking in the right direction for correcting the problem... Compression is good, oil screen was clean, no debris

Answer
The scoring of the bearings may be caused by scored rod bearing journals on the crankshaft, remove the rod bearings and inspect the crankshaft bearing journals and see if they could be the cause of the bearing failure. If the bearing journals are scored then the crankshft either needs to be reground undersize with new bearings or replaced.