Is it possible to change the rod bearings by removing the oil pan? Is this something a novice should attempt? Thanks in advance.
Yup, that's why you want to take so many measurements per journal. If it is out of round or tapered, bad things have happened.If it was knocking, just pull the engine. Chances are, that rod (even if it is a rod) is out of round now, and you'll just be wasting time and a bit of money.