How to identify whether the lubricating oil metamorphic - bearing knowledge

Lubricating oil deterioration after dark black, bubble and has more appear emulsifying phenomenon, grinding with finger, no sticky feeling, hair dry or is faulty, drop on the white paper is dark brown, without a lot of yellow infiltration area or black spots. If they do not change in time will speed up the process of wear parts, affect the service life, safety accidents, even so, often check whether oil deterioration and change in time is particularly important. Several simple identification method, is introduced as follows: (1) take oil flow observation two cups, one of them need to be checked out of the lubricating oil, empty on the desktop, the other will leave the measuring cup with lubricating oil for high 30 - desktop 40 cm and tilt, let oil flow slowly to the empty cup, to observe the flow situation, good quality lubricant oil flow should be long and thin, uniform, continuous, if appear oil flow fast and slow, and sometimes has a large flow, the said lubricating oil has deteriorated. (2) hand twist to lubricating oil lay between the thumb and index finger grinding, good lubricating oil hand feel less lubricity, wear debris, no friction, if feel fingers between the larger friction feeling such as sand, suggests that the impurity, lubricating oil can no longer use, a new lubricating oil should be replaced. (3) illumination method on a clear day, use a screwdriver to lubricating oil lifted, and horizontal Angle of 45 degrees. Contrast sunshine, observe the oil situation, under the light, can see clearly without wear debris in lubricating oil is good, can continue to function, if excessive wear debris, lubricating oil should be changed. (4) oil droplets trace method take a clean white paper, number of oil drops on the filter paper, after waiting for lubricating oil leakage, if the surface is black powder, touch resistance acerbity feeling, is the lubricant inside has many impurities, good oil powder, with the hand feels dry, smooth, and yellow.