Bearing lubricating oil detection

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Normal brown and blue-black. If it was the cream, it indicates that the oil was mixed with diesel oil or water, should be replaced. Dark black, it indicates that the oil has changed, must be promptly replaced.high-speed bearings
Unknown oil, stir drops on white paper (preferably a filter paper), the formation of grease spots, oil spots gradually spread after about 2 to 3 hours from the center outward, forming three concentric rings. According to the color, width and shape of these three regions can identify the status of the oil.china bearing

Remove from the oil low shell with a little oil, painted on the finger twist with your fingers and thumb grinding. If you feel there are impurities in the oil like water no sticky feeling, and even astringent or sour taste, the oil has changed. Twist mill on the finger to see a small shiny metal grinding, then the engine more serious wear and tear parts, also shows that the oil must be immediately replaced.angular contact ball bearing