NANO

ENGINE COMPONENTS 36 9.0 THERMOSTAT: Thermostat: Temperature Range 92 0 C The thermostat controls the flow of coolant as follows: During a cold start, thermostat does not allow coolant to flow to radiator since it is closed; instead the coolant flows through thermostat bypass outlet back to the engine. Thus short circuiting of radiator which helps in attaining engine working temperature in a very short period. As soon as the coolant temperature reaches the opening temperature (92 0 ± 2 0 C) of the thermostat, the thermostat valve starts opening gradually and coolant starts flowing to the radiator. At the same time the thermostat by-pass starts closing gradually. As the engine working temperature reaches thermostat full open temperature (99 0 ± 2 0 C), the thermostat valve opens fully and thermostat by- pass valve closes completely. In this condition maximum quantity of engine coolant flows from radiator to water pump. A. Constructional Detail and Part List: Constructional Details: Part List: Sr. No. Part Description 1 Stem 2 Flange 3 Frame 4 Element 5 Main Spring B. Testing Parameters:  Thermostat start open temperature is 92 0 ± 2 0 C at 0.1 mm travel.  Full open temperature is 99 0 ± 2 0 C at 7 mm (Min.) travel.  Maximum thermostat travel 11.5 mm at 125 0 C.