Repairing the cylinder liners

My question is should I try to fill the pitted areas on the sleeves with some kind of chemical metal or epoxy? Or would this do more harm that good? And how would the silicone sealer work? Thanks in advance for your answers.

The o-ring grooves in the bottom of the block look fairly OK to me so this won"t be a problem but actually I asked if I could repair some of the pitting in the sleeve itself with some kind of epoxy? Or will the silicone take care of that too?

I"m going to hone and reuse the old sleeves because they are in fairly good condition and so are the other parts or the engine. The engine starts well and the oil pressure is very good. I realize that I"ll have to do a complete overhaul to the engine in the future and this is just an attempt to postpone it a little further. I"m on a tight budget right now. The tractor won"t be used very much and it"ll last years before the need for the overhaul. Or at least I hope so.

Thanks again for the answers.

Those pits in the sleeves can be real tiny pin holes clear through them so you are best to replace them.