As the temperature rises in summer, trucks operate for a long time in a high temperature environment, and the engines are subjected to extremely high temperatures, which undoubtedly increases the risk of safety accidents. Therefore, truck drivers must pay more attention to the maintenance and use of engines in summer. Next, we will explore in depth the high temperature challenges faced by Weichai engines in summer and analyze four common causes of high temperature.
Causes of high temperature of truck engines in summer
Radiator and insect screen blockage
The main reason for high engine temperature is the blockage of the radiator surface. In order to enhance the heat dissipation effect, the radiator will be equipped with cooling fins between its thin tubes, but the gaps between these fins are small and are easily blocked by debris such as catkins, soil and insect corpses. Blockage will lead to insufficient ventilation, and then the heat dissipation capacity will be significantly reduced, which will eventually cause the engine coolant temperature to be too high. Therefore, it is very important to clean the radiator thoroughly regularly to ensure that it can maintain the best working condition throughout the summer. At the same time, it is also necessary to pay attention to cleaning the insect screen to prevent insects and other debris from blocking the radiator.
Fan clutch failure
The fan clutch plays an important role in the engine cooling system. Its function is to adjust the fan speed according to the coolant temperature to achieve energy saving. Once the fan clutch fails, it may maintain a low speed even when the coolant temperature rises, causing the engine temperature to continue to rise. Therefore, after excluding other possible causes, if the vehicle has a high temperature phenomenon, the working condition of the electronically controlled silicone oil fan clutch should be checked.
High exhaust back pressure
High exhaust back pressure may also cause high temperature, which is usually attributed to two main reasons: one is that the exhaust brake butterfly valve fails to return normally, resulting in exhaust obstruction; the other is that the muffler or SCR catalyst is blocked internally, causing the exhaust back pressure to increase. These two situations may not only cause the engine temperature to be too high, but also cause power loss and increased fuel consumption.
Thermostat failure
The thermostat is a key component in the engine cooling system. Its function is to ensure that the coolant temperature is maintained within an appropriate range. Once the thermostat fails, such as failing to open in time when the coolant temperature exceeds the opening threshold, or the opening degree is insufficient, it may cause the engine temperature to be too high. When the engine temperature is high during driving, the working condition of the thermostat should be checked first. However, please note that the thermostat should not be removed at will, because doing so may cause the engine temperature to be too low or the preheating time to be too long, which may lead to increased fuel consumption and increased engine wear.
It is worth noting that there are far more reasons for engine high temperature than the above, these are just the most common reasons. At the same time, in addition to the mechanical problems of the vehicle itself, improper operation of the driver may also cause engine high temperature. Therefore, when facing such problems, a comprehensive and systematic inspection should be carried out to accurately diagnose and take appropriate maintenance measures. After all, a truck is a complex whole, and a failure in any link may show a variety of similar failure symptoms.