Rust
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(→Cleaning light surface rust off crankshaft) |
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===Cleaning light surface rust off crankshaft=== | ===Cleaning light surface rust off crankshaft=== | ||
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| − | #Very fine steel wool or scotchbrite pad, and light oil. Rub around the journals in the direction of rotation, not across. | + | Have a machine shop polish the journals. |
| + | May require a regrind to the next correct bearing size prior to polishing depending on tolerances.OR | ||
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| + | Using a decent regular flow of crc 5.56 or a PTFE type spray and an M3 grey scotchy(then try green sctchbrite if need) rubbed in direction of crank travel localised to effected area.(mask off area with masking tape to prevent scratching unaffected areas if possible) | ||
| + | Rust is tough, and large areas vigourously rubbed (mechanically or otherwise) may damage the finish of the journal. Initial contact needs to be with clean crc rinsed rag, keep the journal area clean and a light touch, buffing in one direction untill the initial rust colour no longer shows. If sand paper is to be employed, try starting with 2000 grit(i wouldnt go below 1200) and change paper regularly, keep the strokes light, your only removing the outer scale, but remember 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 be aware and dont leave it on for ages, just 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 occuring on the journal. I wouldnt recommend using steel wool as it scratches the journal finish, if rust is more than 5 thou deep get it resurfaced. | ||
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| + | OR... | ||
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| + | #Very fine steel wool, maybe the most effective against or scotchbrite pad, and light oil. Rub around the journals in the direction of rotation, not across. | ||
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#Cut 600 grip 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. | #Cut 600 grip 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. | ||
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