Small excavator engine water temperature is too high solution

1. Types of construction machinery and equipment


2. Fault phenomenon


The engine water temperature is too high.


3. The actual investigation process


1) Check that the cooling fins of the engine radiator are not blocked or damaged --- normal.


2) Check the amount of cooling water - normal.


3) After removing the thermostat and putting it into boiling water to boil, the thermostat still does not open.


2) After running the engine for several hours without installing a thermostat, the fault no longer occurs and the water temperature is normal.


4. Fault analysis and experience


The causes of excessively high engine water temperature are as follows:


(1) Long time overload operation;


(2) The quality of cooling water is poor, and scale is formed, causing poor heat dissipation and blocking waterways;


(3) Deformation of heat sink;


(4) The radiator is often not cleaned, and the air duct is blocked;


(5) The thermostat is abnormal;


(6) Insufficient cooling water;


(7) The fan blades are deformed and the fan belt is loose.


The usual way to check whether the thermostat is normal is: after putting the thermostat into water and boiling it, the thermostat should be opened, as shown in the state of Figure C, and after cooling, the thermostat should be closed, as shown in the state of Figure A.


The usual way to check whether the thermostat is normal is: after putting the thermostat into water and boiling it, the thermostat should be opened, as shown in the state of Figure C, and after cooling, the thermostat should be closed, as shown in the state of Figure A.


  Thermostat


The structure of the thermostat is shown in the figure. There is paraffin in the heat-sensitive element that is easy to shrink and expand due to cold and heat. The thermal element moves up and down according to the temperature.


Figure A: At first, when the temperature of the cooling water is lower than 75°C, the thermal sensor is in the upward position, so the water channel leading to the radiator is closed, and the cooling water flows directly to the water pump.


Figure B: When the temperature of the cooling water rises to 75°C to 95°C, the thermal sensor drops, the waterway leading to the radiator opens, and the cooling water flows to the radiator and the water pump at the same time.


Figure C: When the water temperature rises higher than 95°C, the thermal sensor continues to drop, and the water channel leading to the water pump is completely closed by the thermal sensor, and all the cooling water flows into the radiator.


V. Actual investigation results


It was determined that the thermostat was abnormal. After replacing the thermostat with a new one, the machine was normal.


During the actual investigation, after the thermostat is removed, the water temperature will generally not be too high.


But it will cause the engine to run too cold. Therefore, after the thermostat is damaged, it must be replaced with a new one in time.

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