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The seven misunderstandings of smooth grease in bearing repair are as follows: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. When the equipment cylinder gasket is buttered, some repair equipment cylinder head gasket; love to apply a layer of butter on the cylinder head gasket; think that this can add the sealing of the engine. It is not only unhelpful; it is harmful. It is well known; the cylinder head gasket is the automobile engine cylinder. Important sealing information between the body and the cylinder head; it not only requires strict sealing of the high temperature and high pressure gas generated in the cylinder; it is also necessary to seal the cooling water and oil flowing through the cylinder head and the cylinder with a certain pressure and flow rate; When disassembling the cylinder head gasket; pay special attention to its sealing quality.
If the cylinder head gasket is buttered; when the cylinder head bolts are tightened; some butter will be squeezed into the cylinder water channel and the oil passage; the butter remaining between the cylinder heads will be in the cylinder operation; due to the high temperature, some will flow into the cylinder Burning; the other is burning charcoal on the interface between the cylinder and the cylinder head; under high pressure and high temperature effect; it is very simple to break down or burn through the cylinder head; it constitutes the engine leak. Do not alter the butter.
2. Diesel vehicles use gasoline engine oil and oil. There are gasoline engine oil and diesel engine oil. Although gasoline and diesel engines operate under the same conditions of high temperature, high pressure, high speed and high load, there is still a big difference between them. The compression ratio of diesel engine is gasoline engine. More than twice as many; its main parts are subjected to high temperature and high pressure impacts much larger than gasoline engines; therefore, the manufacturing materials of some parts are different. For example; gasoline engine main shaft and connecting rod bearing bushes are soft and corrosion resistant. Babbitt alloy is used for manufacturing; while the bearing bush of diesel engine needs to be made of high-performance materials such as lead bronze or lead alloy; however, the anti-corrosion function of these materials is poor. For this reason, in the refining process of diesel engine oil; Anti-corrosion agent; in order to use it to create a film on the outer surface of the bearing pad to reduce the corrosion of the bearing bush; and improve its wear-resisting function. Because the gasoline engine oil does not have such a preservative; if it is to participate in the diesel engine; the bearing bush is in use Simply present mottled, pits; or even the consequences of falling off the pieces; the oil will quickly become dirty; and incurs the burning of the shaft to hold the axis. In addition; The sulfur content of the oil is larger than that of gasoline; this harmful substance will constitute sulfuric acid or sulfurous acid in the process of incineration; together with the high temperature and high pressure exhaust gas, it will enter the oil sump; accelerate the oxidation and transformation of the oil; therefore, the process of diesel engine oil refining It is necessary to participate in some antioxidant additives; make the oil alkaline. If there is acid gas intrusion; it can play a certain neutralization effect; it will not cause the oil to oxidize and metamorphose too quickly. The gasoline engine oil does not add this additive; Because it is neutral; if it is used in diesel engines; it will quickly become invalid due to the corrosion of the above acid gas. Therefore, do not use gasoline engine oil to fill the diesel engine.
3. Domestic cars blindly use imported oil. Some owners think that imported oil must be better than domestic oil; therefore, they use imported oil in domestic cars, especially new ones. They don't know; this is often because of small losses; there are many drawbacks. For example, most imported oils are viscous. It is low; it can't adapt to the demand of domestic car for oil viscosity. In addition, the information of various cooperative parts of domestic engine is subject to thermal expansion coefficient and cooperation gap compared with imported cars; and most domestic car engines do not have equipment oil radiator; if blindly use imported Engine oil; the oil pressure will be low due to the engine being too thin under normal operating temperature; even the standard operating pressure will not be met; the normal smooth demand will not be satisfied; the engine wear will be aggravated.
4. When installing the oil pump, do not add oil to the engine when the corrected oil pump is installed; if the engine oil is not added to the oil pump gear chamber; the oil pump will not pump oil; cause burning of the tile and other things. Because; gear machine The oil pump relies on the cooperation gap between the gear and the inner wall of the casing; and the correct cooperation gap between the gears to attack the suction. If the oil pump is installed or the oil pump is removed, the oil is not added to the gear chamber; the oil pump cannot Satisfactory suction. About the gear oil pump with certain wear; the above expression is more significant. Therefore, do not forget to add oil to the gear chamber when installing the oil pump.
5. The blackening of the oil is the engine oil. The engine oil is operated under more severe high temperature conditions; the simple oxidative enthalpy change; the acidic substance is piled up to form a polymer deposit; the damage is smooth. In addition, the incineration of the exhaust gas into the crankcase will also promote The oil is oxidized and enthalpy. Therefore, after a certain time of use; the oil is generally blackened and smashed; it loses its smooth effect. However, with the continuous improvement of the quality of the smooth oil; especially the implementation of thickened oil; the blackening of the oil does not necessarily determine It means that the oil is changing. This is because the clean sputum agent in the thickened oil causes the sediment on the machine to scatter in the oil; the color of the oil is blackened. Can it be changed; the indicators should be tested; Change the oil; cut unnecessary dregs. For example, add engine oil such as YYl02; use the necessary time; the same will also be black. Therefore, the blackening of the oil does not mean that the oil is changing.
6. Blindly selecting smooth oil smooth oil for smooth, cooling, hygienic and sealing effects. The quality of smooth oil is directly related to the length of service life of the engine; therefore, do not blindly select engine oil. The demand for smooth oil in new cars is very strict; The choice of slick oil, when to replace, how to replace, etc. should be carried out in accordance with the manufacturer's rules.
When selecting engine oil; pay attention to the quality level; also pay attention to the viscosity grade. Firstly, the functional grade should be selected according to the compression ratio and displacement, and then the viscosity grade should be selected according to the temperature and load. When selecting the oil quality, it should be High and low. Good quality oil can ensure the engine is smooth and outstanding, reduce wear, extend engine life, extend oil change interval, reduce the frequency and difficulty of protection and repair. When selecting oil viscosity; except temperature conditions; Ensure that the engine is smooth and sealed; use low viscosity oil as much as possible to save fuel.
7. The use of multi-viscosity smooth oil, the most multi-viscosity smooth oil (also known as multi-grade smooth oil) has the properties of light oil at low temperature, and has the property of heavy oil at high temperature; in the case of introducing multi-grade oil; Multi-grade oils can replace a variety of single-stage oils. Although multi-grade oils are satisfactory for extremely cold and warm seasons and heavy-duty engine oils; especially those that do not have tough diesel fuels in cold weather; Viscous smooth oil; good for engine smoothness; extended engine life. Therefore; do not think that the use of multi-viscosity smooth oil is the best.
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Steel tapes can be divided into self-rolling tapes, braking tapes, and rolling tapes. Other names of steel tape measure are: steel tape measure, steel box ruler.
Seven Mistakes in the Application of Smooth Grease in Bearing Repair
Source: Bearing network time: 2013-07-16