Can a rod bearing be replaced without taking engine out?
Not very easily. If one has spun the others are close to doing the same. Besides there's more work to do.
Yes. Drop the pan after draining motor oil and the crankshaft will be exposed, and I respectfully disagree with the above, it does NOT necessarily indicate another bearing is going to freeze/spin/or whatever, One can go bad and the other(s) could be fine. There may well be an obstruction in the oil passage in that one particular bearing causing this. There may very well be no more work to do.
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