Toyota Repair: 1994camry, rod bearings, minor scratches

Question
i heard aknocking in my engine i removed the oil pan and the #4con bearing which inotice was worn then i notice the crank journal have some lines could I replace the bearing without doing anything to the crank?

Answer
Probably yes, if there are minor scratches they can be cleaned up using some strip fine emery clothe, replace all the rod bearings, be sure to check the bearings to make sure they are standard size or undersized, there should be a stamp on the back that indicates STD or if undersized it will be stamped accordingly, something like
-0.10" or -0.20". If in doubt take a bearing with you to the dealer or autoparts store to match up.