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To properly fix whatever rod bearing that has failed, you will want to remove the engine on the car. It will be easier to work with the engine while out of the car. Because of not knowing what other internal parts may be bad also or any damage done inside the engine block, it would be a good recommendation to remove the engine & properly take apart the engine that way to further check for any other problems.
You can kind of take the bottom end apart from under the car, but would recommend to have a lift when doing so. The only problem is you can only get to one side of the main bearings, also if you needed to remove the crank & pistons, the cylinder head would have to be removed. At that point with as much items you have removed from the engine, you may realize it would have been much easier to remove the engine & have all sorts of room to get to things.
I would recommend to remove the engine if you are overhauling the bottom end of any engine, makes work a lot easier. Ultimately up to you. Any other questions, please let me know. Thank you.
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