1g surface rust on cylinder walls posted by almightyso jun 28 2017.
Light rust on cylinder walls.
Rust is oxidized iron.
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The oxygen in a combustion chamber is never sufficent to create a complete combustion process.
However i m guessing a hone might be the only way to properly clean them up.
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Once the rust is gone clean and preserve the cylinder walls with wd40 or a light coat of motor oil.
Counterintuitively you don t want a perfectly smooth finish on the cylinder bores when installing new pistons or rings.
Combustion releases hydrogen from it s mechaincal bond with carbon and fuses it with an oxygen atom.
Simply apply the naval jelly to the steel wool and gently rub it up and down the cylinder walls until the rust is gone.
You want a cross hatching of tiny scratches that soften the cylinder s surface.
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That is when oxygen penetrates the metal and bonds with the individual iron atoms.
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Rust in cylinder bore phosphoric acid will remove the rust allowing you to see the condition of the bores better.
Maybe a rebore if the rust scars are several thou deep.