1. Butter when installing the cylinder head gasket
Some repairers prefer to apply a layer of butter on the cylinder head when installing the cylinder head gasket, which is considered to increase the engine's tightness. As everyone knows, this is not only useless, but harmful. It is well known that the cylinder head gasket is an important sealing material between the engine block and the cylinder head of the 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 through the cylinder head and the cylinder body. Cooling water and oil, it is required to pay special attention to the quality of the seal when disassembling the cylinder head gasket.
If butter is applied to the cylinder head gasket, when the cylinder head bolts are tightened, a part of the butter will be squeezed into the cylinder water channel and the oil passage. When the butter remaining between the cylinder heads is working in the cylinder, some of the oil will flow into the cylinder due to the high temperature. The other part will burn the coke deposits on the joint surface of the cylinder block and the cylinder head. Under the action of high pressure and high temperature, it is easy to break down or burn through the cylinder head gasket, causing the engine to leak. Therefore, do not apply butter when installing the cylinder head gasket.
2. Diesel car uses gasoline engine oil
The oil is divided into gasoline engine oil and diesel engine oil. Although gasoline engines and diesel engines also work under high temperature, high pressure, high speed and high load conditions, there is still a big difference between the two. The compression ratio of the diesel engine is more than twice that of the gasoline engine. The main parts are much more affected by high temperature and high pressure than the gasoline engine, so some parts are made of different materials. For example, the gasoline engine main shaft and the connecting rod bearing bush can be made of babbitt alloy with soft material and good corrosion resistance, while the bearing bush of the diesel engine must be made of high-performance materials such as lead bronze or lead alloy, but the corrosion resistance of these materials Poor performance. For this reason, in the refining process of diesel engine oil, more anti-corrosion agent should be added, so that a protective film can be formed on the surface of the bearing pad to reduce the corrosion of the bearing bush and improve the wear resistance. Since the gasoline engine oil does not have such a preservative, if it is added to the diesel engine, the bearing bush is prone to spots, pits and even the unfavorable consequences of peeling off during use, and the oil will quickly become dirty and cause the shaft to burn. The accident occurred. In addition, the sulfur content of diesel oil is larger than that of gasoline. This harmful substance will form sulfuric acid or sulfurous acid during the combustion process, and together with the high-temperature and high-pressure exhaust gas, it will enter the oil sump to accelerate the oxidation and deterioration of the oil, so the diesel engine oil is refined. Some anti-oxidation additives need to be added during the process to make the oil alkaline. If there is acid gas intrusion, it can play a certain neutralization effect, so as not to cause the oil to oxidize and deteriorate too quickly. The gasoline engine oil does not add this additive because it is neutral. If it is used in a diesel engine, it will quickly deteriorate 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 engine oil
Some car owners believe that imported oil must be better than domestic oil, so imported oil is used in domestic cars, especially new cars. As everyone knows, this is often not worth the loss, there will be many ills. For example, most imported oils have low viscosity and cannot meet the requirements of domestic vehicles for oil viscosity. In addition, the materials of various matching parts of domestic engines are larger than the imported ones, and most of the domestically produced car engines do not have oil radiators. If blind imported oil is used, the engine will be too thin at normal working temperature. The oil pressure is low, and even the specified working pressure is not reached, which can not meet the needs of normal lubrication, and the wear of the engine is intensified.
4. No oil is added when assembling the oil pump
When the repaired oil pump is installed on the vehicle, if the oil is not added to the oil pump gear chamber, the oil pump will not pump oil, causing accidents such as burning tiles. Because the gear oil pump relies on the small matching clearance between the gear and the inner wall of the casing, and the correct matching clearance between the gears to generate suction. If the oil pump is not installed or the oil is not supplied to the gear chamber after the oil pump is installed, the oil pump cannot generate enough suction. This is more pronounced for geared oil pumps with some wear and tear. Therefore, don't forget to add oil to the gear chamber when installing the oil pump.
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