What are the causes of excessive water temperature in diesel engines?
2 Answers
The reasons that cause the engine water temperature to be too high include: 1. Insufficient coolant: Prolonged water circulation during engine operation can gradually deplete the coolant in the engine's cooling system, leading to a shortage of water in the radiator. If the owner fails to promptly inspect and replenish the coolant, it can easily result in the engine overheating. 2. Radiator leakage: Broken or improperly connected radiator hoses can cause leaks, obstructing water circulation and potentially leading to the engine "boiling over," which is indicated by white smoke. 3. Cooling fan malfunction: A damaged cooling fan or a short circuit in the wiring can prevent the fan from operating or cause it to rotate slowly, preventing the engine's heat from dissipating and naturally raising the water temperature. 4. Thermostat failure: The thermostat controls the flow path of the coolant. If it becomes stuck or fails, the engine's large and small circulation will inevitably be affected, making it impossible to effectively dissipate the engine's heat.
I've been working on diesel engine repairs for many years, and overheating is a common issue, primarily due to cooling system malfunctions. For example, a broken water pump disrupts water circulation, while a slipping fan belt or faulty fan reduces heat dissipation. If the thermostat gets stuck in the closed position, temperatures can spike rapidly in summer. Insufficient coolant or leaks leading to low pressure can also cause overheating. Internal engine issues, like a blown head gasket, allow hot gases to mix with the coolant, accelerating temperature rise. Other factors include radiator clogged with dirt or prolonged high-load driving, especially uphill in mountainous areas, which increases engine strain and overheating risk. Remember to regularly check coolant levels and use a pressure tester to detect leaks; clean the radiator before summer to prevent blockages. Neglecting these can lead to engine deformation or even severe damage, resulting in costly repairs. If the temperature warning light comes on, it's best to stop and inspect immediately.
