There are some misunderstandings in the use and maintenance of cars, which have been formed in the years of low automobile manufacturing level, backward repair means and lack of testing means. These misunderstandings sometimes seem to be correct, but in fact, it is very harmless, which will cause the vehicle to be damaged and the personal safety is threatened, and the greater may be the hidden danger of the accident, or the decline of vehicle performance, the accelerated wear and tear, the shortened life span and so on.

1, blindly dismantle the engine temperature

If the thermostat is dismantled blindly because of the high temperature of the engine, the coolant can only carry on the large circulation, and the cooling strength can not be adjusted. It is difficult to ensure that the engine works at a more suitable temperature. Instead, the engine often works in the low temperature condition, which causes the engine power to fall, the wear loss is accelerated and the fuel consumption is increased. If the engine thermostat is troubleshooting or replaced, the engine temperature is still high, the other parts of the cooling system should be overhauled and the thermostat should not be removed.

2. The temperature of the engine is not afraid of the low and the low

Some people think that when the engine is running, the temperature of the engine is not high. In fact, when the engine temperature is low, the danger is also great. The service life of the engine must be ensured according to the normal temperature required by the vehicle manual.

3. The tighter the better the pump fan belt, the better the better

The tighter the belt is, the better it is. The tightness of the belt will not only lengthen or break the belt, shorten the life of the belt, but also cause the deformation and bending of the shaft of the generator and the shaft of the pump and the early damage of the bearing because of the excessive tension. The tightness of the automobile engine fan belt should meet the technical requirements. When the normal belt is assembled, the deflection is 10-15mm.

4. The engine is heating up at idle speed

When the speed is low, the oil pump can not press the lubricating oil into all the lubricating surfaces quickly, and the oil pressure is low, so that the engine parts work under dry friction or semi dry friction. The fuel oil is bad at low temperature and makes the unburned fuel (mixed gas) into the crankcase, and the oil film on the cylinder wall is washed away. It also accelerates the wear of the machine. So, after the engine starts a few seconds, the application is fast idling heating (the modern car is equipped with a fast idle speed device, after the temperature rises, it will automatically adjust to the idle state) to improve the engine lubrication conditions.

5. Bake oil bottom with a spray lamp

In winter, using a lamp to bake oil bottom will not only make chemical changes in the additives in the oil, but also lose the original performance, but also make the oil cemented and the oil bottom deformed and easily cause the fire. The best way is to choose suitable oil according to the local minimum temperature in winter. Where conditions permit, vehicles should be parked in the garage with thermal insulation facilities.

The more advanced methods are ultrasonic cleaning and spray cleaning, but the most simple and simple method is physical clearance and chemical cleaning. These two methods can also be used concurrently.