As we all know, automobile engine oil is a very important liquid to protect the engine. The oil has the functions of cooling, lubrication and anti-wear. But once the temperature of the oil is too high, the consequences are very serious. The following is a small series for the riders. Some are about the effects of excessive engine oil temperature.
Once the water can not perform the cooling work, it will cause the engine to overheat and make the oil thin, which will affect the lubrication effect of the machine parts, causing the engine parts to burn out, or the wear and tear will increase, causing the engine to be weak.
1. Local overheating due to poor thermal conductivity, especially in parts that are far away from the heat sink in the direction of cooling water circulation, and which are weak in structure, are liable to cause local deformation, cracking and burning;
2. The viscosity of the oil is reduced, the oil is burnt, the oil film of the lubricating parts of the engine is destroyed, and the wear of the machine is accelerated. In severe cases, accidents such as burning of tiles and pulling cylinders may occur.
3. If the engine temperature is too high, the fuel injected into the cylinder will be burned ahead of time, the compression force is insufficient, and the power is reduced. The parts may be stuck due to heat, and the bearing's working ability is greatly reduced.
The cause of excessive water temperature may be due to cooling water leakage, damage to the thermostat, or excessive scale in the waterway affecting the heat dissipation effect! Once the water temperature rises, it will make the water boil and produce bubbles, which will cause the engine to cool badly! However, engine cooling is not only a matter of temperature rise, but a relative temperature is too low:
1. The viscosity of the lubricating oil becomes large, the fluidity is poor, and the frictional resistance of the moving parts increases.
2. Since the temperature of the parts is too low, the heat loss increases, the combustion process deteriorates, and it is easy to form coke in the combustion chamber, resulting in insufficient compression or pre-ignition, and the engine produces knock and power drop.
1 The oil temperature is too high, which is harmful to the engine. The so-called engine temperature is too high, which means that the engine oil temperature and water temperature exceed 90 °C. When these two temperatures are too high at the same time, it will affect the normal operation of the engine and bring certain harm to the engine. Because the temperature of the water mainly indicates the thermal condition of the engine combustion and high temperature parts such as pistons and cylinder walls. Therefore, if the water temperature is too high, the combustion conditions will deteriorate, the high-temperature parts will thermally expand, and the gap between the piston and the cylinder wall will shrink, resulting in severe wear or "cylinder". The oil temperature mainly indicates that the crankshaft and the bearing generate heat due to friction, and the oil dissipates most of the heat, and the balance between heat generation and heat dissipation (expressed as stable oil temperature) is relative. When the amount of heat generated exceeds the amount of heat dissipated, the temperature of the bearing bush rises, the local temperature reaches the melting point of lead, and the lead in the bearing bush melts and precipitates. When a large amount of lead is precipitated, the bearing surface of the bearing bush becomes smaller and unevenr, which causes the wear to be intensified. In severe cases, the local temperature can exceed the melting point of copper (1083 ° C), and the copper also begins to melt, eventually causing severe ablation or occurrence of the crankshaft and the bearing. The consequences of the tile holding the axis. According to the test, when the oil temperature reaches 110 ° C, the oil film temperature in the bearing gap can reach 150 ° C. If the oil film temperature is as high as 150 ° C or more, it is easily broken to form a semi-dry friction. Since the crankshaft bearing is a copper-lead alloy, if the reduction measures are improper, the bearing temperature will be too high and the lead will melt and precipitate, and the consequences are unimaginable. Therefore, when the temperature of the oil and water are too high at the same time, the oil temperature should be lowered first.
2 The temperature of the oil can slow down the speed of the water temperature. The oil temperature is usually reduced by the method of “download, low speedâ€. At this time, although the coolant exchanges heat at a high temperature part for a long time, the water flow speed is slowed down, and the heat dissipation time is prolonged. At the same time, due to the reduced load and reduced speed, the heat generated by the friction of each moving part is also reduced accordingly. Therefore, the oil temperature can not only reduce the heat generated by the engine, but also indirectly reduce the heat absorbed by the coolant, which can also slow down the temperature rise.
3 Oil temperature is one of the main factors affecting oil pressure. When the engine oil temperature is too high, not only the fuel consumption is increased (leakage, evaporation, combustion), but also the quality of the oil is affected, so that the oil film on the friction surface of each part of the engine is not easy. Forming and maintaining, the main oil pressure can not be established, which will aggravate the wear of the machine. The effect of water temperature on oil pressure must be achieved by oil temperature. Therefore, it has a certain indirectness and requires a certain amount of time.
4 The effect of the initial precipitation temperature on the oil pressure of the engine shaft oil shaft is extremely well known. The precipitation temperature is generally a method of “download, high speedâ€. When the rotation speed is too high, the inertia force and centrifugal force of the piston group will be increased, so that the load of the crankshaft bearing is increased. At the same time, the relative friction speed of the journal and the bearing bush will also increase, so that the heat generated per unit time will increase, the oil volume of the oil pump will decrease, and a large amount of oil will be thrown out from the main oil passage, resulting in no friction surface of each machine. Sufficient lubricating oil will increase wear and the oil temperature will rise further.
The above is some of the effects that Xiaobian has compiled for the riders about the excessive temperature of the engine oil of the car. I hope that the riders will remember and protect the engine of their car.
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