Replacing liners without removing the engine.
Sometimes it becomes necessary to replace the bearings on an assembled engine, and while connecting rod bearings are straightforward, replacing the main bearings can be quite a difficult operation. But after watching this video, you can replace the main bearing shells without any problems. Simply take a small bolt or screw that fits into the oil channel and pushes the bearing out with its head when turning the crankshaft. If there's no oil channel in the journals, the bearing can be pushed out with a thin screwdriver or knitting needle.
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Sometimes there's a need to replace the liners on the assembled engine, and if everything is clear with the connecting rods, replacing the molars becomes quite difficult. But after watching this video, you can replace the bearing shells of the main bearings without the slightest problem; you just need a small bolt or screw that fits into the oil can and its hat pushes the liner out when turning the crankshaft. If there is no oil channel in the neck, then the liner is pushed by a thin screwdriver or spoke.