In the early stage of the engine, the water temperature is very fast; when the water temperature gauge indicates 80, the heating rate slows down, it indicates that the thermostat is working normally. On the contrary, if the water temperature increases rapidly, when the internal pressure reaches a certain degree, the boiling water suddenly overflows, it indicates that the main valve is stuck and suddenly opens. When the water temperature gauge indicates 70 ℃ - 80 ℃, open the radiator cap and radiator drain switch, and feel the water temperature by hand. If both hands are tied, it means that the thermostat works normally; if the water temperature at the radiator water inlet is low, and there is no water outflow or little water flow at the inlet pipe of the radiator upper water chamber, it means that the main valve of the thermostat cannot be opened. If the thermostat is stuck or not closed tightly, it should be removed for cleaning or correction, and should not be used with mercy.
Using the communication method, remove the air filter of the engine. Assuming that the smoke emitted by the concrete mixer is not black smoke, it means that the air filter is seriously blocked. It is necessary to eliminate the blocking. Maybe it is very good to change the filter element and change the new filter element. Because the fuel injection pump and governor of the engine are not properly adjusted, the fuel injection quantity of the nozzle is too large, which exceeds the fuel injection quantity of each cycle of the concrete mixer engine. Maybe there is a serious phenomenon of post drip, which constitutes the excessive fuel supply.
The diesel engine of the concrete mixer equipped with turbocharging equipment should be diagnosed and cleaned intermittently according to the defect diagnosis method of the turbocharging equipment in the repair code of the concrete mixer, or the replacement method should be selected, that is, the same type of turbocharger should be used. If there is no black smoke after communication, it can be proved that the black smoke of the diesel engine of the concrete mixer is caused by the damage of the turbocharger. Diesel is a hydrocarbon. Assuming that the engine stops under the condition of short oxygen, the simple composition of stopping is not sufficient, which will lead to the formation of free carbon by some carbon elements without stopping, which will be mixed into the exhaust gas and lead to black smoke.
Open the radiator water inlet cap. If the cooling water in the radiator is quiet, it indicates that the thermostat works normally. Otherwise, it indicates that the thermostat works abnormally. This is because, when the water temperature is lower than 70 ℃, the expansion cylinder of the thermostat is in the shortening condition, and the main valve is closed; when the water temperature is higher than 80 ℃, the expansion cylinder is expanded, and the main valve is gradually opened, and the circulating water in the radiator is initially active.
When the water temperature gauge indicates below 70 ℃, if there is water movement at the radiator inlet pipe and the water temperature is warm, the main valve of the thermometer is not closed tightly, which makes the cooling water circulate prematurely. Assuming that it is a fine dirt, you don't need to mix the car body cleaning agent, just use a towel to clean it immediately. But suppose that the oil film is attached to the glass, and it is difficult to clean it with the usual method. At this time, it is necessary to use the special glass cleaning agent to clean the oil film. Its effect is that the oil film is not easy to adhere to the glass. Before using the special cleaning products for glass, the windows should be cleaned first, otherwise the cleaning effect will be compromised. After the glass cleaner is dry, it will turn white just like waxing. Just wipe it off with a soft cloth.