: I have a block that was very rusted. I took it to my machine shop and asked them to check it out. They did and went ahead and bored it for oversized pistons so they would know if the bore would clean up. My guestion is how do I clean all the rust out of the water jackets and not hurt the machine work? It's real rusty in there. :Thanks Larrylarry--you might try this--since the bores and bearings must be protected--wipe them down with lacquer thinner to de-oil them, then apply duct tape to all the important surfaces-- not masking tape !!!!--plug the oilways with hard wood dowel material cut to fit and hammered in tightly--get one of those little hand sandblast guns--use glass beads or fine garnet grit--blast down into the water-jackets as best you are able--then blow out the grit with an air nozzle fitted with 12" or so of 3/16 steel tube ( brake-line tube) and inspect--repeat as necessary--then scrape into the crevices with a long expendable screwdriver ground to a chisel point and blast again--you will be amazed at the amount of sediment and flake rust which will come out--however---be warned-- the life of the engine will depend absolutely on your complete removal of the left over grit bits from the crank-case, oil- ways, etc.--you might visualise each little grit bit as a sentient malevolent demon--with an obsession for leading its fellow demons on a ban-zai charge into your bearings.
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