Speckles
Raceway surface is matted and speckled. Speckles are clusters
of tiny dents.
Discoloration
The surface color has changed. |
Ingress of foreign objects Poor lubrication Temper color by overheating.
Deposition of deteriorated oil on surface
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Speckles
- Improvement in sealing efficiency
- Filtration of oil
- Improvement in lubrication system
Discoloration
- Oil deposition is removable by wiping with an organic solvent (oxalic acid).
- If roughness is not removable by polishing with sandpaper, it is rust or corrosion. If completely removable, it is temper color due to overheating.
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