Today, when cars are becoming more and more popular, the number of maintenance personnel has also increased sharply. However, many maintenance personnel always think that if they have a little technology, they will open maintenance stores hastily, resulting in more and more second-class maintenance stores outside. Especially when dismantling the car engine, many maintenance personnel will make the following mistakes, Huasheng Audi maintenance consultant takes you to have a look!

1、盲目拆掉发动机节温器如果因发动机温度高而盲目拆除节温器，冷却液只能进行大循环，不能调节冷却强度，难以保证发动机在较适宜的温度下工作，反而使发动机经常处于低温状态下工作，造成发动机功率下降，磨损快，油耗增加。如果发动机节温器发生故障检修或更换之后，发动机温度还高，就应检修冷却系统的其他部位，不能拆除节温器。

1. Remove the engine thermostat blindly. If the thermostat is removed blindly due to the high engine temperature, the coolant can only carry out large circulation and cannot adjust the cooling intensity. It is difficult to ensure that the engine works at a more appropriate temperature. On the contrary, the engine often works at a low temperature, resulting in reduced engine power, rapid wear and increased fuel consumption. If the engine temperature is still high after troubleshooting or replacement of the engine thermostat, overhaul other parts of the cooling system and do not remove the thermostat.

2、发动机温度怕高不怕低有些人认为行车时发动机温度怕高不怕低。其实，发动机温度低时危害性也很大。应根据汽车使用说明书规定的正常温度行车，才能保证发动机的使用寿命。

2. The engine temperature is afraid of high and not afraid of low. Some people think that the engine temperature is afraid of high and not afraid of low when driving. In fact, when the engine temperature is low, it is also very harmful. The service life of the engine can be guaranteed only by driving at the normal temperature specified in the vehicle operation manual.

3、水泵风扇皮带越紧越好皮带越紧并非越好。皮带过紧不仅会使其拉长或断裂，缩短皮带的使用寿命，而且还会因拉力过大，导致发电机轴、水泵轴变形弯曲和轴承的早期损坏。汽车发动机风扇皮带的松紧度应符合技术要求，一般正常皮带装配时挠曲度为10-15mm为宜。

3. The tighter the water pump fan belt, the better. The tighter the belt, the better. Too tight belt will not only lengthen or break the belt and shorten the service life of the belt, but also lead to deformation and bending of generator shaft and water pump shaft and early damage of bearings due to excessive tension. The tightness of automobile engine fan belt shall meet the technical requirements. Generally, the deflection during normal belt assembly is 10-15mm.

4、发动机用怠速升温用怠速升温时，由于转速较低，机油泵不能较快地将润滑油压入各润滑表面，油压也低，使发动机各运动机件在干摩擦或半干摩擦状态下工作；燃油因低温雾化不良，使未燃烧的燃油窜入曲轴箱，冲刷掉缸壁上的油膜，也会加速机件的磨损。所以，发动机启动数秒后，应用快怠速升温，发动机的润滑条件。

4. When the engine is heated at idle speed, due to the low speed, the oil pump can not quickly put the lubricating oil pressure into each lubricating surface, and the oil pressure is also low, so that all moving parts of the engine work under dry friction or semi dry friction; Due to poor low-temperature atomization of fuel, unburned fuel flows into the crankcase and washes off the oil film on the cylinder wall, which will also accelerate the wear of parts. Therefore, after the engine is started for a few seconds, apply the fast idle speed to raise the temperature and the lubrication conditions of the engine.

5、用喷灯烘烤油底冬季用喷灯烘烤油底，不但会使机油中的添加剂发生化学变化，失去原有的性能，而且还会使机油胶结、油底变形，容易引起火灾。更好的做法是根据当地冬季的低气温选用相适应的机油。在有条件的地方，把车辆停放在有保温设施的车库内。

5. Baking the oil bottom with a blowtorch in winter will not only cause chemical changes in the additives in the engine oil and lose the original performance, but also cause engine oil cementation and oil bottom deformation, which is easy to cause fire. The better way is to select the appropriate engine oil according to the local low air temperature in winter. Where possible, park the vehicle in the garage with thermal insulation facilities.

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