Kayou all know that we should always pay attention to the water temperature during driving. Normally, the engine water temperature should be between 80 ° C and 90 ° C. If the water temperature is often higher than 95 ° C or the boiler is boiling, it should be checked for faults. So what causes the water temperature to be too high? I consulted a teacher with 20 years of experience in truck maintenance, Fu. He told me all the reasons for the high water temperature he had encountered before. I summarize the following points:

1. The coolant in the water tank of the North Benz V3 accessory is below the minimum graduation line. This is due to inadequate daily maintenance work and failure to notice the lack of coolant. Add coolant to the specified scale.

2. The cooling fan belt installed on the water tank is not tight enough and slips, resulting in insufficient rotational speed of the fan and water pump. Insufficient rotational speed of the fan leads to too low cold air flow in the water tank, and insufficient rotational speed of the water pump leads to too slow circulation speed of the coolant. "When the water temperature rises, the card users who are equipped with thermal insulation curtains in front of the water tank do not notice opening the thermal insulation curtains for ventilation and cooling. This is mostly the case for card users who often travel north in winter.".

3. The card users who are equipped with thermal insulation curtains in front of the water tank of the North Benz V3 accessory do not notice opening the thermal insulation curtains for ventilation and cooling when the water temperature rises. This situation is mostly caused by card users who frequently travel north in winter.

4. Blocked water pipes in the water tank reduce the cross section of the water pipes and reduce the efficiency of water circulation. Because the blocked water pipes in the heat dissipation pipes in the water tank decrease the cross section of the water pipes, the amount of water entering the upper water pipes in the water tank in the engine is far greater than the amount of water entering the lower water pipes in the engine. As a result, the cooled water accumulates in the upper water pipes in the water tank, increasing the pressure of the upper water pipes, causing water leakage in the water tank, and reducing the amount of water after discharge, causing the engine to overheat.

5. After the thermostat fails, a malfunction or functional degradation of the thermostat after long-term use reduces the opening of the valve, resulting in slow or even interrupted water circulation, leading to excessive engine water temperature. The test standard for determining whether the thermostat can continue to be used is to place the thermostat in water and heat it to check the temperature at which the valve begins to open, the temperature at which it fully opens, and the lift of the valve from open to fully open. The temperature at which the valve starts to open is generally around 80 ° C, and the temperature at which the valve is fully opened is generally around 90 ° C. The working lift of the valve is typically 7-10 millimeters.

6. The water pump fails. If the truck does not add antifreeze in cold weather, the water in the water pump can easily freeze, causing the pump impeller to fail to rotate. When starting the vehicle, the belt forcibly drives the water pump to rotate, which can easily cause damage to the water pump.

7. The fan clutch has failed. Most trucks running on the road now are equipped with a fan clutch, regardless of whether they use domestic or imported engines. Beiben V3 accessory fan clutch: It can adjust the fan speed according to the engine temperature, so that the engine can continue to work at its optimal operating state. When the fan clutch fails, it is easy to cause the water temperature to be too high and the water tank to boil.