What is the reason for the Isuzu 4JB1 engine always having high water temperature?
1 Answers
The reasons for the Isuzu 4JB1 engine always having high water temperature are as follows: 1. Insufficient or inappropriate coolant: Due to the extremely high internal temperature during operation, diesel engines require strict standards for the coolant used. If there is a severe shortage of coolant, it cannot effectively dissipate the heat generated by the engine components, leading to excessive water temperature. 2. Insufficient cooling surface area: Diesel engines are designed with cooling water surface areas matched to their power and load. However, since most of the coolant in water-cooled diesel engines is a mixture of water and ethylene glycol, and sometimes even tap water is added in summer, long-term use of substandard coolant can cause significant scale buildup in the cooling tubes, blocking them and reducing cooling efficiency. 3. Thermostat failure: The thermostat automatically adjusts the amount of water entering the radiator based on the coolant temperature, altering the water circulation range to regulate the cooling system's heat dissipation capacity and ensure the engine operates within the appropriate temperature range. If the thermostat malfunctions, the vehicle's cooling system may fail to perform a large circulation, resulting in increased water temperature.
