Pic. 4.87. Heat exchanger: 1 - branch; 2 - supply of cold fuel; 3 - thermostat; 4 - thermostat housing; 5 – a head of the block of cylinders; A - diesel fuel; B - coolant
heat exchanger (pic. 4.87) integrated into the cooling system and bolted to the side of the cylinder head. It ensures reliable operation of the diesel engine even at temperatures below -25°C. Depending on the position of the thermostat regulator of the cooling system, fuel is supplied through the heat exchanger. When the coolant temperature is below +18°C, all fuel goes through the heat exchanger, from +18 to +30°C, the mixing mode is activated, and at higher temperatures, the fuel does not pass through the heat exchanger.