Let me strongly suggest you pull the crank, and run a rifle cleaning brass brush through all the oil passages. It sounds like a piece of debris was trapped in an oil hole, and the oil pressure pushed it to the rod bearing. There might be more trash lurking in there, waiting to lock it up again. I saw a very expensive race engine ruined by a mud wasp nest in one crankshaft oil hole, after the crank was left in the corner of the shop for a few days prior to assembly.

Even better would be a full teardown, and a trip to someone with a pressure washer, or even the local coin car wash, where you blow out ALL the oil passages in the block. That's a routine part of every engine job I do, even to the point of knocking plugs out of the ends of the passages so I can run a brush down every oil gallery. it's amazing how much crud can come out of a "clean" oil gallery when a tight-fitting brush goes through it!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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