What are the methods to check the lubricating oil, and the methods to detect the lubricating oil

1.Oil flow observation method.

Take two measuring cups, one of which holds the lubricating oil to be checked, and the other is empty on the tabletop, lift the measuring cup full of lubricating oil 30 cm-40 cm away from the table and tilt, let the lubricating oil slowly flow into the empty cup, observe its flow, the first lubricating oil flow should be slender, uniform, continuous, if the oil flow is fast and slow, sometimes there are large pieces of flow, it means that the lubricating oil has deteriorated.

2.Hand twisting.

Twist the lubricating oil between the thumb and index finger and grind repeatedly, the better lubricating oil will feel lubricated, less abrasive debris, no friction, if you feel a greater friction feeling such as sand particles between the fingers, it indicates that there are many impurities in the lubricating oil, can not be used again, should be replaced with a new lubricating oil.

3.Illumination.

On a sunny day, use a screwdriver to lift the lubricating oil at a 45-degree angle to the water level. Compare the sunlight, observe the oil droplets, under the light, you can clearly see that the lubricating oil has no abrasive debris as good, and it can continue to work, if there is too much abrasive debris, the lubricating oil should be replaced.

4.Oil droplet trace method.

Take a clean white filter test paper, drop a few drops of oil on the filter test paper, after the lubricating oil leaks, if there is black powder on the surface, there is a sense of astringency when touched by hand, it means that there are a lot of impurities in the lubricating oil, good lubricating oil has no powder, dry and smooth to the touch of the hand, and yellow traces.

Lubricating oil is very important to the operation of bearings, and the quality of lubricating oil is directly related to the service life of bearings, especially SKF bearings have higher requirements for lubricating oil. If the quality of the lubricating oil is too poor or deteriorates, it will directly affect the work and service life of the bearing, so it is necessary to ensure that the lubricating oil does not deteriorate.

Needless to say, the importance of lubricating oil to bearings is needless to say, so when using bearings, always check the lubricating oil to ensure that the grease has not deteriorated. Some companies don't know how to check the deterioration of grease, in fact, it is very simple, and the main methods are as follows:

Oil droplet trace method. This method is relatively simple, first of all, take a clean white filter test paper, drop a few drops of lubricating oil on the filter test paper, after the lubricating oil penetrates, if there is black powder on the surface of the paper, and there is a sense of astringency when touched by hand, it means that there are many impurities in the lubricating oil and need to be replaced. A good lubricant is powder-free, dry and smooth to the touch of the hand, and has yellow marks.

2.Hand twisting. This method requires wearing gloves, that is, twisting the lubricating oil between the thumb and index finger and grinding repeatedly, and the better lubricating oil feels lubricating to the hand, with less grinding debris and no friction.

If you feel the friction of sand particles between your fingers when rolling, it means that there are many impurities in the lubricating oil and can no longer be used, and the lubricating oil should be replaced with a new one.

Illumination. This needs to be done on a sunny day, choose a sunny day, and use a screwdriver to lift the lubricating oil at a 45-degree angle to the water level. Observe the oil droplets according to the sunlight, and the lubricating oil under the light can clearly see the abrasive debris and impurities inside.

1. Take two measuring cups by oil flow observation method, one of which holds the lubricating oil to be checked, and the other is empty on the tabletop, lift the measuring cup full of lubricating oil 30-40 cm away from the desktop and tilt it, so that the lubricating oil slowly flows into the empty cup, and observe its flow.

2. Hand twisting method will twist the lubricating oil between the thumb and index finger and grind repeatedly, the better lubricating oil hand feels lubricated, less abrasive debris, no friction, if you feel the sand between the fingers and other large friction Li Dongyou, it indicates that there are many impurities in the lubricating oil, can not be used again, should be replaced with new lubricating oil.

3. On a sunny day, use a screwdriver to lift up the lubricating oil at an angle of 45 degrees with the horizontal plane. Shine on the sun, observe the oil droplets, under the light, you can clearly see that there is no abrasive debris in the lubricating oil is good, and it can continue to work, if there is too much abrasive debris, the lubricating oil should be replaced.

4. Take a clean white filter test paper by the oil droplet trace method, drop a few drops of oil on the filter test paper, after the lubricating oil leaks, if there is black powder on the surface, there is a sense of astringency when touched by hand, it means that there are a lot of impurities in the lubricating oil, and there is no powder in the good lubricating oil, which is dry and smooth to the touch, and there are yellow traces.

Summary. Lubricating oil testing items include: appearance, density, viscosity, viscosity index, flash point, freezing point and pour point, acid number, base number and neutralization value, oxidation stability, thermal stability, etc. ”

Lubricating oil testing items include: appearance, density, viscosity, viscosity index, flash point, freezing point and pour point, acid number, base number and neutralization value, oxidation stability, thermal stability, etc. ”

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Compared with mineral oil, synthetic oil has a longer service life and more stable viscosity, and is the main raw material for high-end oil manufacturing. The world's major refineries have the capacity to produce base oils, and there are significant differences between different quality base oils**. Ordinary Class II base oil is generally 10,000 yuan per ton, while high-quality synthetic oil can reach 40,000 yuan per ton.

Lubricants also require a variety of additives to improve their cleaning function, anti-wear properties, and the durability of carbon slime. What is the ratio of base oils to additives? This is the secret of every lubricant manufacturer.

<> transmission oil is to keep the gear system clean oil **, can ensure the normal operation of the gearbox and prolong the life of the transmission device according to the structure of the gearbox, the transmission oil is divided into automatic transmission oil and manual transmission oil too much or too little will damage the gearbox, the resistance of the oil is too large, too much may cause engineering or make the variable volt grip transmission oil blister and deteriorate, resulting in abnormal wear and tear of parts for manual transmission oil, generally every 10,000 kilometers to check the almost, its replacement cycle is generally 60,000 kilometers. For automatic transmission fluid, the replacement interval is long, generally every 80,000 km.

The replacement cycle of power steering oil is generally long, it is recommended to replace it every 2 years or 40,000 kilometers, generally speaking, it can be tested every six months, and the detection of power steering oil also includes oil loss and pollution. The quality identification of power steering oil is more difficult because there is no reference standard, but generally speaking, new power steering oil is generally red and has a certain degree of transparency, while power steering oil will turn black after a long time, and the transparency will be greatly reduced.

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My method is to test the lubricating oil first, observe the appearance of the lubricating oil, touch it with your hands, apply it to the pulley for finger touch, or test it through some instruments. Letter spine.

Check the lubricating oil cap.

After making a simple judgment, we can make a targeted inspection and problem judgment by simply judging whether the cylinder head gasket, cylinder head or cylinder block has any damage or defective problems.

After opening the car cover, unscrew the fuel filler cap, turn it over and carefully observe the cleaning situation at the bottom of the cover, after a long period of use, there is a grease mixture or viscous impurities on the fuel filler cover, we can judge whether there is a problem through this small detail. Here are some common signs and problems with oil cap ports.

If there is a dark emulsion with a viscous consistency at the bottom of the filler cap and small droplets of oil mixed with the oil, it may be that the head gasket, cylinder head or cylinder block are damaged. In this case, it may have a certain impact on the inside of the engine, and serious transportable blind cars need to be overhauled.

First, through the exhaust inspection, second, look at the color of the lubricating oil, the third staring at the sun, check the summary of the lubricating oil, fourth, check the amount of lubricating oil, fifth, check the lubricating oil anti-counterfeiting mark.

1. Look, the more translucent the better, and there should be no miscellaneous hailstones.

2. Shake the oil vigorously to see how long the bubbles disappear, the shorter the better.

3. Stir with water to see if it can be quickly stratified without emulsification.

4. Smell the smell, the pungent is not good, the warm taste is even tasteless.

5. Oil stain comparison method, dripping the same new lubricating oil on the white paper and the lubricating oil that is being used Qingqing are compared with each hail of sails.