Maintenance knowledge five common methods of car error maintenance

People arecarThere are some misunderstandings in use and maintenance, which have formed for a long time in the age of low automobile manufacturing level, backward repair methods, and lack of inspection methods. Sometimes these misconceptions may seem correct, but they are not. They are very harmful and will cause damage to the vehicle and threaten personal safety. It is more likely that the hidden danger of the accident will be buried, or the performance of the vehicle will be degraded. Accelerated wear and shortened life.

1. Blindly dismantle the engineThermostat

If the thermostat is removed blindly due to the high engine temperature, the coolant can only carry out a large cycle, and the cooling intensity cannot be adjusted. It is difficult to ensure that the engine works at a more suitable temperature. Instead, the engine often works at a low temperature, resulting in a decrease in engine power. , The wear is accelerated, and the fuel consumption increases.If the engine temperature is still high after the engine thermostat is overhauled or replaced, it should be overhauledcooling systemThe other parts of the thermostat cannot be removed.

2. The engine temperature is afraid of high, not afraid of low

Some people think that the engine temperature is not afraid of high or low when driving. In fact, the hazard is also great when the engine temperature is low. The service life of the engine should be ensured by driving according to the normal temperature specified in the car's instruction manual.

3.Water pumpfanbeltThe tighter the better

The tighter the belt is not the better.Too tight the belt will not only stretch or break, shorten the service life of the belt, but also cause excessive tension.DynamoDeformation and bending of shaft and water pump shaft and early damage of bearings. The tightness of the fan belt of the automobile engine should meet the technical requirements. Generally, the deflection of the normal belt assembly should be 10-15mm.

4. The engine uses idling speed to heat up

When using idling speed to heat up, due toRotating speedLower, the oil pump cannot quicklylubricating oilPressing into each lubricating surface, the oil pressure is also low, so that the moving parts of the engine work under dry friction or semi-dry friction; the fuel is poorly atomized due to low temperature, causing unburned fuel (mixed gas) to escapeCrankshaftThe tank, scouring away the oil film on the cylinder wall, will also accelerate the wear of the parts. Therefore, a few seconds after the engine is started, the fast idle speed temperature rise (a fast idle device is specially equipped on modern cars, and the engine temperature will automatically adjust to the idle speed state) to improve the lubrication conditions of the engine.

5. Bake the oil bottom with a blowtorch

Using a blowtorch to bake the oil bottom in winter will not only chemically change the additives in the oil and lose its original performance, but also cause the oil to cement and deform the oil bottom, which may cause fires. The best way is to choose suitable engine oil according to the local minimum temperature in winter. Where conditions permit, it is best to park the vehicle in a garage with insulation facilities.

The more advanced removal methods are ultrasonic removal and nuclear spray removal, but the most used and simplest methods are physical removal and chemical removal. These two methods can also be used at the same time. (Dahe Net)