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Misunderstanding of Using Lubricating Grease in SKF Bearings

Source: FAG bearings  Tags: News

1. Grease when installing the cylinder head gasket

Some repairers like to apply a layer of butter on the cylinder head gasket when installing the cylinder head gasket, believing that this can increase the seal of the engine. 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 cylinder head of an automobile. It not only requires strict sealing of the high temperature and high pressure gas generated in the cylinder, but also must seal the pressure and flow rate that penetrates the cylinder head and cylinder block. Cooling water and engine oil require special attention to the sealing quality when disassembling the cylinder gasket.If you put butter on 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 butter left between the cylinder head gasket works in the cylinder, due to the high temperature, part of the butter will flow into the cylinder and burn. The other part will be burned and deposited on the joint surface of the cylinder block and the cylinder head. Under the action of high pressure and high temperature, the cylinder gasket is easily broken or burned through, causing engine air leakage. Therefore, do not apply butter when installing the cylinder head gasket.

2. Do not add oil when assembling the oil pump

When installing the repaired oil pump on the vehicle, if the oil pump gear chamber is not filled with oil, the oil pump will not pump oil, causing accidents such as tile burning. Because, the gear oil pump relies on the small matching clearance between the gear and the inner wall of the housing and the correct matching clearance between the gears to generate suction.
If the gear chamber is not filled with oil when the oil pump is installed or after the oil pump is cleaned, the oil pump cannot produce sufficient suction. For geared oil pumps with certain wear, the above phenomenon is more obvious. Therefore, do not forget to fill the gear chamber with oil when installing the oil pump.
3. The black engine oil is the engine oil deterioration

Engine oil works under severe high temperature conditions, and is prone to oxidative deterioration, producing acidic substances and superimposing polymer deposits, which will damage lubrication. In addition, the combustion of exhaust gas into the crankcase will also promote the oxidation and deterioration of the oil. Therefore, after using for a certain period of time, the engine oil usually turns black and deteriorates and loses its proper lubricating effect.However, with the continuous improvement of the quality of lubricating oil, especially the popularization and use of thickened oil, the blackening of oil does not necessarily mean that the oil has deteriorated. This is because the clean dispersant added to the thickened engine oil disperses the deposits on the parts in the oil, making the engine oil black. Whether it has deteriorated, various indicators should be tested, and the oil should be changed regularly according to its quality to reduce unnecessary waste.  SKF 2211 E -2RS1KTN9 bearings online , pls click here :

4. Blind selection of lubricants

Lubricating oil plays the role of lubrication, cooling, cleaning and sealing. The quality of lubricating oil is directly related to the length of the engine's service life, so don't choose engine oil blindly. New cars have very strict requirements on lubricants. Which lubricants to choose, when to replace them, how to replace them, etc. should be carried out in accordance with the manufacturer's regulations.

When selecting engine oil, both the quality level and the viscosity level must be paid attention to. First, select the performance level according to compression ratio and displacement; then select the viscosity level according to temperature and load. When selecting oil quality, it should be high rather than low. Good quality oil can ensure good engine lubrication, reduce wear, extend engine life, extend oil change intervals, and reduce the frequency and difficulty of maintenance and repair. When selecting the oil viscosity, in addition to the temperature conditions, low-viscosity oil should be selected as far as possible under the conditions of ensuring the lubrication and sealing of the engine to save fuel.

5. Lubricant is only added and not replaced

Many car owners only pay attention to checking the amount of lubricating oil and adding it according to the standard, instead of checking the quality of the lubricating oil, and neglecting the replacement of the deteriorating oil, which leads to the fact that the moving parts of some engines are always in poor condition. Operate in a lubricated environment, thereby accelerating the wear of various lubricating parts. Therefore, generally speaking, the lubricating oil of the engine should be replaced when the car is driving 3500~5000km.

6. Add more lubricating oil instead of less

The hazards of too little engine oil are well known. Therefore, some car owners are afraid of lack of oil to burn tiles, and think that adding more lubricating oil is better than adding less. Therefore, they often do not add lubricating oil according to the regulations and make the lubricating oil exceed the standard. In fact, too much lubricant has many harms:

⑴ The crankshaft agitates when the car is running, which deteriorates the oil foam and increases the rotation resistance of the crankshaft. Therefore, it will not only increase engine fuel consumption, but also reduce engine power.

⑵ As the engine oil flees from the cylinder wall to the combustion chamber and burns more, the oil consumption increases.

⑶ Accelerate the formation of coke deposits in the combustion chamber, making the engine prone to deflagration.

Therefore, it is a misunderstanding that the engine oil should be more than less. Generally, the oil level should be kept slightly lower than the scale on the oil dipstick. Too high oil level will backfire.

7. The higher the lubricating oil viscosity, the better

In order to prevent abrasion of the contact surface between the moving parts, the lubricating oil must have sufficient viscosity so that an oil film can be formed between the moving parts at various operating temperatures. However, the viscosity of the lubricating oil must not be higher than the degree that affects the start of the engine, and it is required that the friction generated under continuous operating conditions is minimal. The use of lubricating oil with excessive viscosity will increase the wear of the machine parts, this is because:

⑴ Engine lubricating oil viscosity is too large, the flow is slow, the upward flow is slow, and the oil pressure is high, but the amount of lubricating oil through is not much, and it cannot be added to the friction surface in time.

⑵Due to the high viscosity of the lubricating oil, the friction between the friction surfaces of the parts increases. In order to overcome the increased friction, more fuel is consumed and the output power of the engine is also reduced.

(3) The viscosity of lubricating oil is large, the oil circulation speed is also slow, its cooling and heat dissipation effect is poor, and it is easy to overheat the engine.

⑷Because the lubricating oil circulation speed is slow, the number of passes through the lubricating oil filter is small, and it is difficult to clean the worn-out metal chips, carbon particles, and dust from the friction surface in time.

Therefore, do not use engine lubricating oil with too high viscosity, let alone think that the higher the viscosity, the better. Under the condition of ensuring lubrication, according to the temperature range during use, the low viscosity lubricant should be selected as much as possible. However, for engines with severe wear and large gaps, lubricating oil with a slightly higher viscosity can be appropriately selected.

8. The more grease in the hub bearing of SKF bearings, the better

When some car owners maintain the hub bearings in SKF bearings, they fill the hub bearings and cavities with grease, and think that the more the better, it is not. Filling the wheel hub cavity with grease will cause most of the grease to be thrown into the wheel hub cavity. Not only can it not be added to the bearing, but it will flow to the brake shoes in the brake drum, causing the brake to fail. The increase in rolling resistance will cause overheating of the wheel hub and cause unnecessary waste. Therefore, just apply a thin layer of grease to the cavity of the hub. It not only ensures the lubrication of key parts, but also facilitates the heat dissipation and cooling of the wheel hub, while saving a large amount of grease.

9. Use lubricating oil to thin the grease

When some repairers use grease in winter, they like to add lubricating oil to the original grease to dilute. This approach is wrong. Because the structure of grease is a colloidal structure system composed of thickener and base oil, the thickener forms a structural network, and the base oil (usually ordinary lubricating oil) is adsorbed in the network to form a stable structural system, which will thicken The agent and base oil will not separate. If lubricating oil is added after the grease is formed, although it is stirred, it cannot be evenly dispersed and contained in the network, and it is easy to separate and lose during use, which is not conducive to lubrication.

10. Mixed use of new and old grease

New grease and old grease cannot be mixed even if they are the same type. Because the old grease contains a lot of organic acids and impurities, if it is mixed with the new grease, it will accelerate its oxidative deterioration. Therefore, when changing the grease, the old grease on the parts must be cleaned before adding new grease.