Diesel fire pump engine cooling using dual closed loop heat exchanger cooling system. The system has advantages of high cooling efficiency and less impact on the environment temperature in the pump room. Cooling water flow, from the water pump outlet pipe to heat exchanger, which is composed of a valve control, make the engine cooling water temperature maintained at run time between 85 and 95 DEG C. If the water temperature is too high, can increase the valve opening, increase heat exchanger cooling capacity, reduce the engine cooling water temperature; conversely, the ball valve can be closed, increased engine cooling water temperature.
