Hold brick car after running more than two years, the emergence of the engine water temperature anomalies. After the cold start, in a short time, and the temperature increased rapidly boiling occurs, the cooling water is additionally added after the return to normal. After detailed examination of the cooling system (of which has replaced the water pump, thermostat, fan belt), found no significant faults. Finally, check the engine disintegration, found that the third cylinder liner with a 25mm long crack, replace the cylinder, troubleshooting. Domestic car holding bricks from the structure in terms of the cooling system is relatively simple, generally by the cooling fan, radiator, thermostat and other elements. The cooling fan is often directly driven by the engine, and the fan speed and engine speed is consistent. Rely mainly on the cooling water temperature control thermostat. On this and the general sense of the car used by the electronic temperature control fan with heatsink adjust blinds, which are quite different. This structure is characterized by easy maintenance, and low cost. The disadvantage is that the control of the cooling water temperature insensitive. Main engine water level and the thermostat is working properly, the pump can build enough pressure to speed cooling fans can meet the relevant standards. Cooling system failure judgment to determine whether these components should also work to start. 1, check the thermostat on the engine currently used in the wax-type thermostat thermostat based. Its main performance under different temperature thermostat should have different lift. To dynamically control the level of cooling water temperature. For non-disintegration of the cooling system to check the thermostat is good or bad, mainly through the radiator inlet and outlet temperature difference to discrimination. In the engine is cold started some time ago, into the outlet temperature difference should be obvious touch, after working for some time, the temperature difference was significantly reduced. Touch feeling no obvious difference in temperature (80 ℃ -90 ℃) when the engine reaches normal operating temperature. Of course, the most accurate method for detecting or removing the thermostat, which was placed in hot water, gradually heated, and the check valve opening temperature of the valve lift. 2, the power of the pump to check the cooling water in the cooling system from the cycle of the pump source. Pump can build enough pressure is the key to the cooling system working properly. When adding cooling water, as if the engine speed increases, the cooling surface decreased, indicating that the pump is working properly. Conversely, you may loose water pump impeller, the cooling water is not circulating. In the domestic truck engines, pumps, generators, cooling fans share a belt tension of the belt and therefore directly affect the pump, fan and generator speed. Middle finger pressure belt, under deflection should be 11-13mm is normal, the water temperature is too high resulting in too large, too small will be on the water pump bearings, generator bearings damage. 3, the cooling fan fan air flow testing tissue can be put in front of a radiator when the engine is running, if the paper can be blown open, then the air flow is sufficient. This is a front-engine car fan inward suction distinction. Leaves can not hold against, and put the fan shroud should ensure complete and effective. 4, brick car radiator radiator hold placed on the rear of the vehicle. Due to the low brick hold the car chassis, and poor plant operating environment, some of the debris, it is easy to accumulate dust in the radiator surface, if not cleaned, it will seriously affect the cooling effect. Daily work is completed to deal with the radiator surface carefully cleaned, try to avoid using water cannons. Because the thin wall of the radiator, if the pressure is too high, then cleaned easily washed deflated, affecting circulation effect. In addition, the cooling water is prohibited to use "hard water" in order to prevent scale radiator, resulting in insufficient cooling water added. The main components in the above judgment to check no fault, the system should consider other issues. If the combustion chamber is too much carbon, diesel fuel injection time is too early or too late, cylinder head gasket is burned or cylinder, cylinder cracks. Symptoms such as listed at the beginning of this article, it is because the liner cracks, fleeing into the high-pressure gas heated water jacket and bubbles emerge, it seems as cooling water boil. In short, the failure of the engine cooling system is varied, but just keep awake thinking, careful analysis of the substance of the problem, or to find a solution for. 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