ENGINE COMPONENTS 36 9.0 THERMOSTAT: Thermostat: Temperature Range 920 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 (920 ± 20 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 (990 ± 20 C), the thermostat valve opens fully and thermostat bypass 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 920 ± 20 C at 0.1 mm travel. Full open temperature is 990 ± 20 C at 7 mm (Min.) travel. Maximum thermostat travel 11.5 mm at 1250 C.
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