Methods to delay lubricating oil deterioration[汽车维修知识]

Gasoline engine, diesel enginelubricating oilIn the working process, it is necessary to interact with higher temperature parts such as cylinders,pistonIt is also affected by high-temperature gas when it comes into contact, and its working conditions are quite demanding. In recent years,carAs the compression ratio increases, the load increases. Therefore, the requirements for lubricating oil are getting higher and higher. During use, the lubricating oil is also more prone to deterioration. As a result of the deterioration of the lubricating oil, it not only shortens the life of the lubricating oil, but also damages the engine. Therefore, measures need to be taken to delay the deterioration rate of lubricating oil when the engine is working.
1. Use lubricating oil that meets the quality requirements. The quality of lubricating oil has a great influence on whether it is easy to deteriorate during use. When lubricating oil works in a diesel engine or a gasoline engine, the main properties related to the deterioration tendency are viscosity, cleanness and dispersion, and anti-oxidation and anti-corrosion properties.
The viscosity is too large, inPiston ringThe more glue film is generated in the area, piston skirt and inner cavity; if the viscosity is too small, the seal between the cylinder and the piston ring is not tight, which will cause the lubricating oil to be diluted by the fuel oil, and the gas will enterCrankshaftThe tank makes the lubricating oil easy to produce precipitation. Therefore, lubricating oil with a certain viscosity must be used as required. < car repairHome of the Maker－www.carxl.com.cn>
When the cleansing and dispersibility is not good, it is easy to form a film and precipitation. Glue film is a viscous substance. It can make the piston ring adhere to the piston ring groove and lose its elasticity without sealing, and accelerate the dilution of lubricating oil and the formation of precipitation. The detergency and dispersion of lubricating oil is mainly improved by adding detergency and dispersant. Therefore, all the engine lubricating oils used in automobiles need to be added with a detergency dispersant, otherwise, it will quickly deteriorate. The working temperature of diesel engine is higher, so more detergent and dispersant are added to diesel engine lubricating oil. Supercharged, high-speed, and high-load engines should contain more and more efficient detergents and dispersants. When some gasoline engines use gasoline engine lubricating oil, if the deterioration is found to be rapid, consider using diesel engine lubricating oil instead.
When the anti-oxidation and corrosion resistance is not good, the lubricating oil is easily oxidized and polymerized to increase its viscosity rapidly, and organic acids are generated to corrode metals.Improve the anti-oxidant and anti-corrosion properties also rely on the addition of anti-oxidantsAnticorrosiveto fulfill. Therefore, anti-oxidant and anti-corrosion agents should be added to the engine lubricating oil used in automobiles.
2. Strengthen maintenance and correct use of lubricating oil coarse and fineFilterwithair filter. The coarse and fine lubricating oil filters can filter out impurities and precipitation in the lubricating oil in time, so it can extend the life of the lubricating oil.Therefore, the coarse filter handle should be turned 1~2 turns after parking every day; the fine filter should be cleaned on time according to the regulations, the filter element should be checked and replaced in time; the sediment in the coarse and fine filters should be cleaned frequently (using centrifugalOil filter, The rotor should be maintained when the car is driving 6000~8000km. The sediment on the inner wall of the car should be scraped with bamboo blades, and the rotor and nozzle should be cleaned, blown with compressed air, and it is strictly forbidden to use iron wire to pass through). In addition, care should be taken to keep the filter oil path unobstructed. The filter element of the filter element should be pressed smoothly and properly, so as not to increase the gap and reduce the filtering effect.
The dust content in the atmosphere in industrial areas can be as high as 0.0037~1g/m3, and the suburbs and residential areas also have half of this figure. In recent years, the northern area has been affected by sandstorms in spring, and the dust content in the atmosphere has also increased several times. If the air enters the engine , The harm to the lubricating oil and the wear and tear of the engine are serious. Therefore, the air filter should be cleaned and oil changed according to regulations, and the cleaning and oil change time should be shortened in dusty areas. Use paper filter elements, the service life should not exceed 20000km, and replace them regularly.
Three, strengthenCrankshaftCheck the box ventilation device to keep it clean and unobstructed. Crankcase ventilation can clear the gas in time to prevent moisture and carbon dioxide in the gas from entering the lubricating oil and accelerate the formation of precipitation. Strengthening the inspection of the crankcase ventilation device to keep it clean and unobstructed is an important measure to delay the deterioration of lubricating oil.
4. Repair in time to maintain the normal cooperation of cylinder and piston. According to experience, when the wear of the engine cylinder reaches 0.30~0.35mm, the working condition of the engine will deteriorate rapidly, and the fuel oil and gas leaking into the crankcase will greatly increase, which will accelerate the deterioration of the lubricating oil. At the same time, the amount of lubricating oil that enters the cylinder and is burned also increases. Therefore, the cylinder is worn to a certain degree and must be repaired in time and should not be used reluctantly.
5. Keep a certain oil temperature, water temperature and oil pressure during use. The gasoline engine should keep the lubricating oil temperature 80~85℃ and the water temperature 80~90℃ during use. Diesel engines should also maintain a certain oil temperature and water temperature according to the instructions. When the engine oil temperature and water temperature are too high, the lubricating oil is likely to oxidize and polymerize at high temperatures to produce high-molecular gums, asphaltenes and other substances; but at low temperatures, it is easy to condense the gas and cause liquid phase corrosion. Precipitation occurs in the crankcase, etc.
The lubricating oil pressure should also be kept within the specified range. If the pressure of lubricating oil is too high, it will cause a large amount of lubricating oil to flee into the combustion chamber, which not only wastes lubricating oil and pollutes the environment, but also increases coking in the combustion chamber of the engine; Large parts are worn and there is even a risk of cylinder pulling.
6. Clean the lubrication system in time. According to regulations, the engine lubrication system should be washed in time to avoid soiling the lubricating oil and shorten the service life. The cleaning method is: when the engine stops working, immediately release the hot lubricating oil into a clean container to concentrate and precipitate. Blow out the lubricating oil pipeline with compressed air, and clean the lubricating system with low-viscosity lubricating oil or a mixture of diesel and lubricating oil. It is not advisable to wash with kerosene, otherwise it will reduce the viscosity of the replaced lubricating oil and cause poor lubrication of the parts during startup, causing wear. Then, release the mixed oil, and replace it with the old lubricating oil that has been replaced for a long time and settled in accordance with the regulations.

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