Use a scraper to remove all traces of gasket material from the cylinder block. Be careful not to scratch the block surface.
Remove the main bearing caps and pull out the bearing shells. Mark the shells from which cylinder, whether they were in the cap or the cylinder block, and set them aside.
Remove all threaded plugs from the oil passages. Usually they do not unscrew and have to be drilled out. For now, plug the holes with rags, and install new plugs when reassembling.
The engine block is usually steam cleaned in a workshop, but with some precautions it can be done at home.
after steam cleaning, clean all the holes and oil channels again using special brushes. Rinse the channels with warm water until the water comes out clean. Dry the block thoroughly and wipe all machined surfaces with oil that prevents corrosion
If the block is not too dirty, you can clean it with hot soapy water and a stiff brush. Regardless of the cleaning method, thoroughly clean all holes and oil passages, dry the block completely, and apply oil to all machined surfaces.
Run a tap of the appropriate size through all threaded holes to remove traces of corrosion, deposits and sealant residue. If possible, blow compressed air through the holes after this operation to remove any small particles that have formed.
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Install the main bearing caps and finger tighten the bolts.
Apply sealant to the new plugs and install them into the holes. Use a bushing and hammer to seat the plugs in place, the bushing diameter should be slightly smaller than the plug and hammer. Seat the plug slowly and stop when it is flush with the block. Make sure the plugs are not warped and are seated correctly.
Apply non-hardening sealant to the oil passage thread plugs and screw them into the holes in the block. Make sure they are securely tightened.
If the engine is not going to be reassembled immediately, cover it with plastic wrap to keep it clean.