What does it mean to resleeve an engine and what’s the difference between the engine head and block?
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If you take the ‘head’ off the engine then when you look down you are going to see where the cylinder articulates. Inside the head are the injectors and the valves that let the air in and out. So, for that reason, it is a critical component and it must be removeable because you will have to eventually service the parts in there or replace the gasket that goes between the cylinder head and block.
You typically don’t replace a cylinder on a car engine but the process is common on aircraft piston engines which are of a similar design. After a period of time and use, the surface of the wall that surrounds the piston can get pitted and damaged with use. Resleeving it means to replace that wall with a new one. Not all engines can do this, the sleeve is built into the block so to get that done you need to send the engine block back to the manufacturer for a rebuild. Typically you wouldn’t do that either, you would just buy a rebuilt block and sell yours back to the manufacturer so they can rebuild it and sell it back to someone else.
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