The locomotive engine failure will increase because of the water temperature is too high. In general, the water temperature is too high with many fan belt too loose, cooling water tank heat sink was grime sundry jam, radiator, thermostat failure radiator core plug and factors such as water pump failure. Among them, the first three factors of fault judging by visual inspection, the latter two factors needs a certain experience for accurate judgment. To judge the fault of thermostat failure?

First, after starting the engine and check. Open the cooling water tank and water cap, if the cooling water tank of water indoor cooling water flow phenomenon, said thermostat has a foreign body damage or card between the main valve. When checking the thermostat in the above 80 ℃ hot water, after being rising main valve to open the main valve, removal of foreign body between the valve. If the main valve cannot be opened, should replace the thermostat, because when the water temperature is below 70 ℃, thermostat expansion the ether or paraffin was contracting inside the cylinder, the main valve closed, cooling water in engine water jacket of small and medium-sized circulation state, only the passage of water tank section channel is probe is main valve to close. When the water temperature of 80 ℃ thermostat main valve is opened, through to flow to the water tank.

Second, check the engine work after a period of time. 1. When the water table indicating 70 ℃ (available water thermometer testing, same below), if there is water flow tank radiator inlet line, hot water temperature, cooling water can make the early systemic circulation, thermostat main valve closed lax problems.

2. When the water temperature higher than 80 ℃, expansion tube in ether or paraffin, main valve is opened, the water began to large cycle, water tank inside the radiator circulating water to flow, the water flow through the tank cover visible, thermostat works well, otherwise the thermostat need to change.

Three, observation of water thermometer method. 1. The observation of dynamic water thermometer pointer. When the water temperature below 80 ℃, observe the water temperature table, at the beginning of the engine operation, water temperature table pointer to rise quickly. When the water temperature higher than 80 ℃, water temperature table pointer at a slower pace, thermostat to work normally. If the water temperature has been rising quickly, when the tank pressure to a certain extent, suddenly boiling water overflow, indicates that the main valve probe is failures have binding or section, need to change. 2. Feel the water temperature. When the water temperature table indicating 70 ℃ ~ 80 ℃, open the water cooling tank cover on the water and the water in the switch, feel the water temperature, thermostat works well if all hot. If the cooling water tank and water inlet water temperature is low, thermostat main valve cannot open or opened entirely, at this point you will need to replace the thermostat.