The engine is overheating! What's going on?
There are generally two reasons why diesel engine water temperatures can overheat: first, a poor cooling system; second, a malfunction in the engine itself. So how do you determine the cause?

The most common cause of overheating in a diesel engine is insufficient coolant. When a diesel engine is operating, a large amount of unused heat accumulates in the engine components. If there's insufficient coolant, even if everything else is normal, the heat dissipation won't be effective.

Typically, the thermostat valve gradually opens between 78 and 88 degrees Celsius as the engine temperature rises, allowing more coolant to participate in the engine's cooling cycle. Common thermostat failures include the main valve failing to fully open, becoming stuck between the main and secondary circuits, aging, or poor sealing leading to expansion valve leakage. These problems can lead to poor cooling water circulation and engine overheating.

Because diesel engines operate at higher temperatures, higher requirements are placed on the heat dissipation and lubrication properties of the engine oil. Overfilling the engine oil will increase the engine's operating resistance. However, insufficient oil can affect lubrication and heat dissipation. Therefore, when changing the engine oil, it's crucial to follow the recommended oil level; more is not always better.

The commonly used silicone oil clutch fan adjusts its speed based on temperature fluctuations. The key control component is the spiral bimetallic temperature sensor on the front cover of the silicone oil fan. If it breaks or fails due to fatigue, the cooling fan will stop or operate at a low speed, affecting engine heat dissipation. Similarly, for other belt-connected cooling fans, the belt tension should be checked and adjusted to ensure the fan speed is maintained.

Diesel engines inevitably produce some metal debris during operation. This, combined with the ingress of airborne debris and the formation of oil oxides, gradually increases impurities in the oil. Many people, hoping to save a few dollars, use inferior oil filters. These filters not only clog easily, losing their ability to trap impurities in the oil, but also exacerbate wear on other engine components, such as the cylinder block. The result is not worth the cost.

When the engine works under heavy load, it will generate more heat, especially when a heavily loaded dump truck is climbing a slope, the water temperature is very likely to be too high; if this happens often, truck drivers should pay attention. If the engine is in such a working state for a long time, its service life will be greatly reduced, so you must know when to stop and do what you can!