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What is the normal temperature range for diesel engine coolant?

1 Answers

OReese

07/29/25 4:57pm

Diesel engine coolant temperature is generally maintained between 65°C and 95°C for optimal operation. Automotive engines require a specific operating temperature range for proper functioning, as temperatures that are too high or too low can adversely affect engine performance and operation. Additionally, conventional air cooling is often insufficient to dissipate the heat generated by engine operation, which is why water cooling systems are widely adopted in automotive engines. Causes of diesel engine overheating: 1. Prolonged overloading: Continuous operation under excessive load increases fuel consumption and thermal stress, leading to elevated coolant temperatures. To prevent this, avoid extended periods of overloading. 2. Insufficient coolant: Low coolant levels in the diesel engine cooling system will impair heat dissipation, resulting in engine overheating. Regularly check the coolant level in the radiator and expansion tank, and replenish when low. 3. Interference between cooling components (in construction machinery): If hydraulic oil coolers and water coolers are arranged in series, elevated hydraulic oil temperatures will inevitably raise the intake air temperature on the water cooler's air inlet side, compromising its cooling efficiency. Address this by inspecting the hydraulic system's cooling performance to minimize the impact of hydraulic oil cooler inefficiency on the diesel engine's water cooling system.

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