Editing Rust (section)
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===Cleaning light surface rust off crankshaft=== Have a machine shop polish the journals. May require a regrind to the next correct bearing size prior to polishing depending on tolerances. Using a decent regular flow of CRC 5.56 or a PTFE type spray and an M3 grey scotchy (then try green scotchbrite if need) rubbed in direction of crank travel, localised to effected area. Mask off area with masking tape to prevent scratching unaffected areas if necessary. Rust is tough, and large areas vigourously rubbed (mechanically or otherwise) may cause damage to the finish of the journal. Initial contact needs to be with clean CRC rinsed rag, keep the journal area clean and use a light touch, buffing in one direction until the initial rust colour no longer shows. If sand paper is to be employed, try starting with 2000 grit (no less than 1200 grit), change paper regularly, and keep the strokes light. You are only removing the outer scale, you are not resurfacing the journal just rubbing out rust. Phosphoric acid localised can help in any pits. Acids on hardened steels can cause embrittlement so dont leave it on long, only enough to blacken the rust. Afterwards switching to a microfibre rag with a product like Autosol, Blue Magic or even Brasso, you can polish out any minor scratches on the journal. Steel wool usually isn't recommended as it can scratch the journal finish, and it creates fine particles that must be throuoghly cleaned from the crank. If rust is more than 0.005" deep get it resurfaced. Also- * Very fine steel wool or scotchbrite pad, and light oil. Rub around the journals in the direction of rotation, not across. * Cut 600 grit wet or dry sandpaper into strips the width of the crank journals. Wrap it around the journal, and secure it with tape. Then, make a strap from leather, about one-half the width of the sandpaper strips. Use the strap on the paper in a shoeshine motion. Finish off with some light oil on the sandpaper. Do a few strokes first, then clean the paper, because the rust will clog the sandpaper. ''(LP3 as rust inhibitor on crankshafts?)''
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