1. Water pump
Open the water tank cover and start the engine to make the engine run alternately at high speed and low speed. At the same time, check whether the water in the water tank has obvious rolling phenomenon. If so, it can be considered that the water pump is normal.
2. Thermostat
Remove the thermostat and check the opening temperature of the thermostat. Hang the thermostat and thermometer in the water container, then heat the container, observe the starting opening temperature of the thermostat, continue heating, record the full opening temperature of the thermostat, and check whether the two temperatures are within a reasonable range. Finally, stop heating and check whether the thermostat is closed when the water temperature drops below 82 ℃. Otherwise, the thermostat needs to be repaired or replaced.
3. Water tank including radiator
Check whether there is scale on the surface of the water tank and whether the cooling air duct and the water flow channel inside the water tank are unobstructed. If necessary, ask professional personnel to disassemble and clean it.
4. Fan
Check whether the fan blade is damaged, seriously deformed or installed reversely, and whether there is shimmy, etc. If so, it shall be excluded immediately.
5. Fan belt
Press the fan belt by hand to check whether the tightness is normal. If the belt is loose, further check whether the fan belt slips, etc.
6. Air guide and heat dissipation system
Water Cooled Engines mostly adopt suction cooling. The air on both sides of the water tank shall not have convection. Except that the cooling air duct of the water tank is connected, other parts shall be isolated. It can not be ignored that after many machines have been used for a period of time, the barrier materials are aging and falling off seriously, so that there is an airway around the water tank, reducing the air flow through the water tank and causing high temperature. In actual maintenance, there are many such cases.
7. Too much engine scale
Check whether there is too much dirt on the engine housing and water channel. If so, clean it up.
