lubricating oil:

1, the moisture inspection; (1), the grease inject in a test tube, observe the transparency, if not clear transparent and cloudy, can preliminary judgement in lubricating oil contains water; (2), in the test tube put into about over half oil, heating to 100 ~ 120 ℃ or so, such as a sound, and have bubbles appeared or wall condensation water , explain that moisture. (3), the white powder copper sulfate in the test tube with oil, if copper sulfate be blue and precipitation in the bottom, and that water in lubricating oil.

2, the particle inspection; (1), in a clean glass plate is placed in the levels, respectively drops to check a drop of oil and standards of quality lubricants, and then will tilt the glass, to compare the two oil flow speed and distance, velocity, distance, that low viscosity, and viscosity is high. (2), will stay check the oil and standards of quality lubricants are installed in two test tubes, oil level in a test tube below 5 ㎜ mouth, mouth shut the test tube, the two test tube and at the same time, observe the speed of the bubble rising, if be seized lubricating oil than the standard oil bubble rising fast, explain this oil viscosity of low viscosity oil than standard, and is high.

3, lubrication performance identify; touch lubricant friction between thumb and index finger, such as a sticky feel that the oil has good lubrication performance, if feel doesn't work smoothly, explain the lubrication performance has been deteriorated.

 
4, mechanical impurities examination; gasoline will lubricating oil dilution filtering, observe filter out impurities.



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