What are the common mistakes in the use of grease? Grease is an important variety of automotive lubricants. It is a thickened lubricating oil with a viscous semi-solid ointment similar to butter, so it is commonly known as butter or yellow dry oil. There are many incorrect understandings and practices of using grease in automobiles, causing some unnecessary losses. 1. Filling the universal joint cross shaft with butter General automotive maintenance manuals clearly stipulate that the key teeth and intermediate bearings of the telescopic sleeve of the transmission shaft use calcium grease, and the needle bearings of the cross shaft and the intermediate bearings of the rear axle drive shaft of the three-axle drive car use gear oil. However, in actual work, due to the lack of refilling equipment, some repairers mistakenly used calcium-based grease to lubricate the cross-shaft needle bearings for the convenience of drawings, causing a large number of premature cross-bearing damage. Because the nozzle for filling the gear oil of the universal joint cross shaft is a very common grease nozzle, it often causes a misunderstanding. In fact, the grease cannot be filled on the needle bearing. Because of the high viscosity of butter, when using a grease gun to add butter to the inner cavity of the cross shaft through the oil nozzle, the resistance of butter into the oil passage of the narrow inner oil tank is very large. At this time, the butter will overflow by the pressure and open the pressure reducing valve opposite the oil nozzle The repairman mistakenly believes that the bearing has been filled with oil. In fact, the butter cannot only enter between the needle rollers, but it is also difficult to reach the end face of the cross journal. Therefore, the method of lubricating the universal joint cross shaft with butter instead of gear oil should be changed, and the gear oil should be filled with the gear oil pressure gun. 2. The more grease added to the hub bearing, the better Some drivers fill the wheel bearings and cavities with grease when servicing the wheel bearings, and think that the more the better, but this is not the case. Filling the hub cavity with grease will cause most of the grease to be thrown into the hub cavity, not only can it not be added to the bearings, but will flow to the brake shoes in the brake drum, causing the brake to fail. Increased rolling resistance will overheat the hub and cause unnecessary waste. The correct approach is to apply a thin layer of grease to the hub cavity. This not only guarantees the lubrication of key parts, but also facilitates the heat dissipation and cooling of the hub, and at the same time can save a lot of grease. 3. Add lubricating oil to make the grease thinner Some repairmen like to use lubricating oil to dilute the original lubricating grease when using grease in winter. This is wrong. Because grease is a colloidal structural system composed of thickener and base oil, the thickener forms a structural network, and the base oil (generally ordinary lubricating oil) is adsorbed in the network to form a stable structural system, so that the thickener and Base oil will not separate. If lubricating oil is added after the fat is formed, it will not be evenly dispersed and contained in the network even after stirring, and it is easy to separate out and lose during use, which is not conducive to lubrication. If you need to use a grease with a small consistency in winter, you can use a small number of 1 or 2 calcium-based grease. 4. Mixed use of old and new grease New grease cannot be mixed with old grease, even if it is of the same type. Because the old grease contains a lot of organic acids and impurities, if mixed with the new grease will accelerate its oxidative deterioration. Therefore, when changing the grease, the old grease on the parts must be cleaned, and then the new grease should be added. Five, maintenance leaf spring filling with butter In order to prevent the wear of each steel sheet, some repair personnel maintain and install leaf springs, and add grease during assembly. It should be noted that this is a wrong practice that does not meet technical requirements. Because the butter is easily squeezed out from between the steel plates, at the same time it is easy to adhere to the dust, which will quickly rust and disassemble the leaf springs and reduce the service life of the leaf springs. When maintaining or assembling leaf springs, graphite calcium base grease should be applied. Graphite calcium base grease is made by adding 10% flake graphite to calcium base grease. Graphite itself is a good lubricant, and its pressure resistance is good. During car driving, especially on uneven roads, each steel plate has strong vibration and friction. Graphite calcium-based grease is used. Due to its good pressure resistance, it is not easy to be squeezed out from between the steel plates. Protective effect, prolong the service life of leaf spring. 6. Grease the tire bolts and nuts In order to easily tighten the nuts and prevent corrosion, many drivers and repairmen apply oil to the bolts and nuts of the tires. This is a wrong approach. Because, according to the knowledge of mechanical principles, after the tire nut is tightened, the threads have the characteristics of self-locking. This is because the helix angle of the thread is smaller than the equivalent friction angle between the threads. In a given bolt connection, the helix angle is a certain value, and the equivalent friction angle changes with the friction state between the threads. Obviously, after oiling, the equivalent friction angle between the threads decreases, and the self-locking performance of the bolt connection deteriorates. Therefore, never apply grease or oil to the bolts and nuts of the tires, otherwise the nuts will loosen and the tires will run away, causing serious accidents. 7. Filling the starter bearing with butter Starter bearings generally use self-lubricating bearings or porous oil-containing bearing alloys. It is an oil-containing friction-reducing alloy made of metal powder (iron or copper powder), mixed and pressed, sintered, and immersed in lubricating oil at a certain temperature material. It is mainly used in situations where it is difficult to refuel, heavy load at high speed or low speed, and frequent commutation. It is divided into iron graphite and bronze-graphite according to the composition of the substance. When the starter is maintained, do not use gasoline to clean the bearings, so as not to dilute the lubricating oil, it should be scrubbed with a clean cloth or cotton yarn; it should not be added with grease, because the bearing fit gap is relatively small, the grease cannot be retained in the bearing, throw Landing on the brush and commutator after exiting will cause the starter to be weak, and in severe cases will cause the commutator to ablate. But a few drops of GL-385 / 90 gear oil can be dropped on the bearing. After driving 50,000 kilometers, the bearings should be cleaned with gasoline and then immersed in GL-3 gear oil at about 120 ° for 1 hour, which will make the use effect better. 8. Decoupling lubrication clutch release bearing Most domestic automobile clutches use closed side pressure ball separation bearings, and the selected greases are mostly calcium-based greases and calcium-sodium-based greases. Most maintenance personnel, when lubricating the separation bearing, heat and melt 50% of the lubricating oil and grease, and then immerse the separation bearing in the oil to make it full, and then cool it. Although this method completes the filling task, the effect is not good. Because heating will destroy the structure of calcium-based grease, reduce the lubricating performance of the grease, resulting in premature wear of the separation bearing and shorten its service life. The correct method is to use the filler to fill. Nine, apply butter when installing the cylinder head gasket Some repairmen like to apply a layer of butter to the cylinder head gasket when installing the cylinder head gasket, which may increase the engine's tightness. As everyone knows, this is not only useless, but harmful. As we all know, the cylinder head gasket is an important sealing material between the cylinder block and the head of the automobile engine. Not only is it required to seal the high temperature and high pressure gas generated in the cylinder, but also must be sealed through the cylinder head and the cylinder with a certain pressure and flow rate of cooling Water and oil require special attention to the sealing quality when disassembling the cylinder head gasket. If butter is applied to the cylinder head gasket, when the cylinder head bolts are tightened, part of the butter will be squeezed into the cylinder water passage and oil passage. When the grease left between the cylinder head gaskets is working in the cylinder, part of it will flow into the cylinder and burn due to the high temperature. The other part will form carbon deposits between the cylinder and the head of the cylinder head, under the action of high pressure and high temperature, it is easy to breakdown and burn through the cylinder head, resulting in engine air leakage. Therefore, do not apply grease when installing the cylinder head gasket. 10. Apply grease to rubber parts In order to make it easier to install some rubber hoses (mostly in the cooling system), some maintenance personnel apply grease to the inner surfaces of the two ends of the rubber hoses or the outer surfaces of the corresponding mechanical joints. This method can make the assembly work easier and easier, but the contact between the rubber parts and the grease will accelerate the aging and permanent deformation of the rubber parts, which will affect the performance and service life of the rubber hose, so this approach Undesirable. To achieve the purpose of easy assembly, it is safer to apply cooling water to the corresponding parts. 3D Glass Mosaic Tiles turn your walls into works of art. With textures that range from subtle to dramatic, it's easy to find one of these artistic designs that speaks to you. 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