What should be paid attention to during the use an

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What should be paid attention to during the use and maintenance of the lubrication system

attention shall be paid to the following aspects during the use and maintenance of the lubrication system:

* use engine oil with appropriate quality grade, viscosity and brand

* the storage container of lubricating oil must be clean and sealed to prevent moisture from mixing; It is better to store the oil indoors to avoid oxidation due to high temperature and direct sunlight

* change the oil regularly

* always check the oil level of the oil pan to ensure that the oil level is normal

* before starting the engine in winter, turn the handle for several turns, and then start the engine

* during operation, pay attention to the oil pressure and oil temperature

* observe and record the oil consumption

* keep the crankcase well ventilated

* when the engine is shut down, do not continuously blow the throttle, otherwise the residual fuel gas in the cylinder washes the oil film on the cylinder wall to accelerate wear, or leaks into the crankcase to dilute and pollute the lubricating oil

* maintain the air filter frequently

* regularly clean the parts of the lubrication system

how to determine the oil change interval

due to different engine designs, it is recommended to determine the oil change interval according to the provisions of the vehicle operation and maintenance manual. There are often some differences in the oil change cycle of different brands of cars. The main basis for determining the oil change cycle is:

* type of fuel used by the engine

* operating temperature

* load condition

* road and climate conditions in the area of use

* technical conditions of the engine

what are the problems if the oil is not changed on schedule

failure to change the oil on schedule will significantly reduce the wear resistance of the engine oil to the engine. The engine oil is mixed with sludge, carbon deposit, water, acidic substances and incomplete combustion products produced by fuel combustion. At the same time, the additives in the engine oil will be consumed with the use, which will affect the service performance of the engine oil. Timely replacement of engine oil can not only eliminate the pollutants inside, but also ensure that the service performance of engine oil remains at a reasonable level

why use multi grade oil

compared with single-stage oil, multi-stage oil has the following advantages:

* used throughout the year

* good cold start performance, which can ensure the smooth start of the engine under the condition of low temperature

* improve fuel economy, and generally reduce fuel consumption by 2 ~ 3% compared with the use of single-stage oil

* reduce lubricating oil consumption

what are the requirements for the use of multi-level oil

* when using multi-level oil, the engine oil pressure is slightly low, indicating that the flow resistance is small and the circulation is smooth. If you are still worried about poor lubrication, you can increase the oil pressure

* multi grade oil turns black after being used for a period of time. This is the result that the added detergent disperses the sediment on the machine part into the oil, which is a normal phenomenon

* multi grade oils produced by different manufacturers cannot be mixed

what are the reasons for excessive oil consumption of automobile engines

there are many methods to measure the consumption of automobile engine oil. Now, it is more common to calculate the oil consumption according to the automobile driving mileage. The normal consumption is about 0.3 L/1000 km. If it exceeds 0.5 L/1000 km, it can be considered that the engine oil consumption is excessive

the main reasons for excessive oil consumption are as follows:

* excessive clearance between piston and cylinder wall

* the piston ring is worn or damaged, and the piston ring is incorrectly installed

* the oil level of crankcase is too high

* intake valve guide is severely worn

* there is leakage in the oil circuit

* engine speed too high

* poor crankcase ventilation

* flash point of base oil is too low

generally, oil with low viscosity consumes more than oil with high viscosity

why does the engine oil turn black

in automotive engines, either gasoline or diesel engines will cause incomplete combustion for various reasons. The oil sludge in the oil pan of gasoline engine is mainly caused by incomplete combustion due to insufficient horsepower when the car is stopped and started. The research shows that the oil sludge mainly comes from gasoline rather than lubricating oil. The higher the olefin content in gasoline, the more oil sludge will be. For diesel engine, driving conditions and fuel quality will cause soot formation. High sulfur content and olefin content in diesel oil

will cause high soot content and make the engine oil turn black quickly. Therefore, the reasons for engine oil blackening are as follows:

* fuel quality. The higher the olefin content in the fuel, the higher the sulfur content. It is easy to form oil sludge in the gasoline engine and soot in the diesel engine, and the faster the engine oil blackens

* the structure and working conditions of the engine are different. For example, when the engine is started and stopped, it is easy to generate oil sludge in the gasoline engine, and soot is formed in the incomplete combustion of the diesel engine, resulting in the easy blackening of the engine oil

* the blackening of the engine oil and the generation of sludge are also related to the long-term overload and high-temperature operation of the axial tensile machine caused by the engine under the axial load, the non cleaning of the engine and oil pan when changing the engine oil, and the filtering performance of the engine oil filter

in order to prevent oil sludge or soot from forming paint film on the cylinder, dispersant shall be added to the engine oil. The more dispersant, the better dispersion, the less paint film, but the more black the oil. Therefore, high-grade oil tends to darken faster than low-grade oil. Therefore, the blackening of engine oil can not be an indicator to judge the quality of engine oil

the quality of engine oil during driving is not judged by the speed of blackening, but by the oil change index of internal combustion engine. China's national standards are gb/t and gb/t, the main indicators are viscosity growth, acid value, alkali value, wear, etc., and color blackening has never been used as an indicator

what are the reasons for the "red light" of the car

after changing the engine oil, the engine oil lamp alarm occurs during idling or driving, which is often called "red light" by drivers. The "red light" often indicates that there is a fault in the lubricating system of the engine. It indicates that the engine oil pressure is too low and should be stopped immediately for inspection. If you continue to drive, the engine will be seriously worn due to poor lubrication, and even endanger the normal operation of the parts, resulting in engine failure

when the "red light" phenomenon occurs, it is generally necessary to analyze the fault causes from the following aspects:

* whether the oil viscosity is selected correctly

generally, the viscosity of engine oil is selected according to the local climatic conditions. If the viscosity is improperly selected, such as the high temperature in summer in Central Plains, if sae30 oil is selected, the problem of "red light" will easily occur. The above is for vehicles with good engine condition. For vehicles with poor vehicle condition, such as vehicles running more than 100000 km or vehicles not maintained in time or improperly, the engine piston and cylinder clearance are large. When selecting, oil with high viscosity grade can be appropriately selected. For example, SAE40 oil is normally selected, and sae50 oil can be selected if the vehicle condition is poor, which can properly ensure that the oil pressure of the engine is normal. If the condition of the car is too bad, the engine must be repaired thoroughly

* whether it is the oil itself

unqualified oil products are used, and the viscosity or shear of engine oil do not meet the requirements; Excessive oil consumption and insufficient oil volume can lead to insufficient oil pressure. In addition, the oil in the oil pan is diluted by gasoline, and the viscosity of the oil becomes smaller, which can also lead to the reduction of the oil pressure, resulting in the "red light" problem

* whether the lubrication system works normally

the lubricating system does not work normally, and the fault causes are: the oil pump is worn; The oil filter is blocked; The adjusting spring force of the pressure limiting valve is too low or the spring is broken; The oil filter bypass valve is not sealed or its spring is broken, the elastic force adjustment is too small, the oil pipe joint is loose, the oil pipe is broken and leaks oil or there is a serious leakage at some part of the oil passage; The engine crankshaft bearing or connecting rod bearing clearance is too large, and the camshaft bearing clearance is too large; The oil pressure gauge or sensor fails

why should the oil with slightly higher viscosity be used for vehicles with long age or poor conditions

the clearance between the piston ring, cylinder wall, crankshaft journal and connecting rod bearing bush of the old car is larger than that in the normal state, so the engine oil with higher viscosity is required to play a better sealing role and prevent the pressure relief of the oil circuit

the viscosity of lubricating oil is closely related to the friction power of engine and the wear of moving parts, so that our business can really start. The sealing degree of piston ring, the consumption of lubricating oil and fuel, and the cold start of engine are closely related. Suggestion: for vehicles with heavy wear and tear, sae50 viscosity product is recommended for the national market in summer; In winter, the use of sae1 in the north of the great wall can not only eliminate people's previous impression of "light and cheap" plastics 0w/40, but also sae15w/40 in the south of the Great Wall, the north of the Yangtze River and sae20w/50 in the south of the Yangtze River. Excessive viscosity of lubricating oil will bring the following adverse effects:

* it is difficult to start the engine at low temperature

* parts wear is aggravated during startup

* large power loss

* poor cleaning effect

* poor cooling effect

does the overhauled vehicle use high viscosity lubricating oil or low viscosity lubricating oil

vehicles after overhaul must use low viscosity lubricating oil. Because the overhauled vehicles need to be run in, the use of lubricating oil with low viscosity is conducive to cleaning, heat dissipation, filtering of metal abrasive particles, and rapid access to the lubricating parts. For the overhauled vehicles, if the lubricating oil with high viscosity is used, it is easy to cause early wear and engine Bush burning, cylinder pulling and other failures. It is recommended to use engine oil with viscosity of 10w/30, 30 or 15w/40 during the running in period

the overhauled four stroke motorcycle should also be run in with low viscosity lubricating oil

how to obtain the best effect of engine running in

in order to obtain a good running in effect, it is necessary to have a good running in specification. Factors affecting the running in effect generally include:

* running in time

* running in wear

there are three correct combinations: cold running in, no-load thermal running in and load thermal running in:

cold running in generally means that the engine is driven by an external motor without load. The motor power is determined according to the engine power, which is generally 40% higher than the engine power. The speed at the beginning of cold running in shall not be too low. Too low speed will cause too much heat generated by friction, which is easy to damage the lubrication of the friction surface. On the other hand, too low speed and high pressure make it difficult to form oil film lubrication, and even the oil can not reach some moving pairs (such as the moving pair of overhead camshaft), so the wear is large. At the same time of preventing too low rotating speed, it is also necessary to prevent too high rotating speed, too high rotating speed, too high oil temperature, low oil viscosity and deterioration of lubrication conditions. Generally, the starting speed shall be 20~25% of the rated speed of the engine, and the ending speed shall be 40~55% of the rated speed. The lubricating system of the engine after running in shall be thoroughly cleaned

what are the reasons for the engine Bush burning and axle holding

* the quality of crankshaft and bearing bush is poor, and the smoothness of journal and bearing bush is poor, especially for vehicles that have been overhauled and replaced with bearing bush

* the large and small tiles are installed incorrectly and the clearance is adjusted improperly

* the gear of the oil pump is seriously worn and fails, the oil supply pressure decreases, and the oil is difficult to supply to the specified lubrication position, resulting in dry friction of the bearing bush

* the oil passage of the engine oil is blocked by dirty impurities, which blocks the engine oil to the crankshaft and forms dry friction of the bearing bush

* the oil pipeline leaks, the pressure of the oil circulating supply system drops, and the oil is difficult to supply to the specified lubrication position, resulting in dry friction of the bearing bush


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