Don't take engines completely apart unless there is a real need to replace worn or broken parts. There is a high probability that you wont be able to place the liner back into the same exact position, even if it has a locating pin. There are microscopic wear patterns that get disturbed.
Like with surgery, the gain has to outweigh the risk.
If you want to do a super engine cleaning, fill a jar with Hoppes gun cleaning solvent. Take your engine with the head and backplate removed and dunk it into the jar. Put the lid on the jar and duct tape it to an orbital sander. I clamp the whole works into a bench vise, turn it on and go watch a ball game. It ias amazing what you will find after a couple of hours. Denture cleaners can be used the same way.
If you're a beginner with a late model engine that has bad bearings already, it might have some kind of warrantee?
When I began adding an oz of Sig castor to every quart of store bought fuel, rust has never been a problem.