Know whether the lubricating oil has deteriorated[汽车维修知识]

lubricating oilAfter a period of use, due to the contamination of mechanical impurities and dust from the outside, the metal shavings worn down by the running parts and the metal salts formed by the corrosion of the parts, the lubricant will deteriorate.
After the lubricating oil deteriorates, it is dark black, foamy and emulsified. It has no sticky feeling, astringent or peculiar smell after grinding with fingers. It is dark brown when dripping on the white test paper, and there are no yellow infiltration areas or many black spots. If it is not replaced in time, it will accelerate the wear of parts, affect the service life, and even cause safety accidents. Therefore, it is particularly important to check whether the lubricating oil has deteriorated and replace it in time.
Several simple identification methods are introduced as follows:
① Observing the oil flow method Take two measuring cups, one of which contains the lubricating oil to be inspected, and the other empty on the desktop. Lift the measuring cup full of lubricating oil 30-40 cm away from the desktop and tilt it to slow down the lubricating oil. Slowly flow into the empty cup and observe its flow. The oil flow of good quality lubricating oil should be slender, uniform and continuous. Spoiled.
② Twist the lubricating oil between the thumb and the index finger for repeated grinding. The better lubricating oil feels lubricating, less abrasive, and frictionless. It indicates that there are too many impurities in the lubricating oil and can no longer be used, and the lubricating oil should be replaced with a new one.
③ Illumination method On a sunny day, use a screwdriver to lift up the lubricating oil and make a 45-degree angle with the horizontal plane. Contrast with sunlight and observe the condition of oil droplets. Under sunlight, it can be clearly seen that there is no wear debris in the lubricating oil as good, and it can continue to work. If there are too many wear debris, the lubricating oil should be replaced.
④ In the oil drop trace method, take a clean white filter test paper, and drop a few drops of oil on the filter test paper. After the lubricant leaks, if there is black powder on the surface and there is a sense of resistance to touch by hand, it means that there are impurities in the lubricant. There are many, good lubricating oil has no powder, and it is dry and smooth to the touch with yellow marks. <car repairHome>

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