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Light rust on cylinder walls.
1g surface rust on cylinder walls posted by almightyso jun 28 2017.
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Rust is oxidized iron.
You want a cross hatching of tiny scratches that soften the cylinder s surface.
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After a few minutes of running the piston rings will wear away the excess finish polishing the walls for a perfect seal.
However i m guessing a hone might be the only way to properly clean them up.
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Counterintuitively you don t want a perfectly smooth finish on the cylinder bores when installing new pistons or rings.
Once the rust is gone clean and preserve the cylinder walls with wd40 or a light coat of motor oil.
Combustion releases hydrogen from it s mechaincal bond with carbon and fuses it with an oxygen atom.
Either way you still have the crosshatch in there so with how light that looks it will more than likely go away when the rings seat in 474 1 0 1.
Rust in cylinder bore phosphoric acid will remove the rust allowing you to see the condition of the bores better.
That is when oxygen penetrates the metal and bonds with the individual iron atoms.
Maybe a rebore if the rust scars are several thou deep.