Before you get carried away. Use a broom handle and touch all over with one end and listen on the other. I don't hear anything on the first video. The inside cab video: I hear an exhaust leak. A stethoscope is nice to have also. HF has them. Yes when they say "mains" they mean main bearings, crankshaft bearings. Yes when you pull the oil pan you can see the bearings.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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