5.2.2. Thermostat z General descriptions and main data The thermostat maintains a constant temperature of coolant (71 ~ 85 ° C) and To radiator improves thermal efficiency of the engine by preventing heat loss. Namely, when the temperature of coolant is low, the thermostat valve is closed to make the coolant bypass to Bypass valve From cooling water pump To bypass tube directly enter the water pump; when the coolant temperature rises to open wide EC8OM005 the thermostat valve, the bypass circuit is closed and the water passage to the radiator is opened so that the coolant is forced to flow into the radiator. NOTE :
There are 2 kinds of thermostats according to surrounding and operating conditions. One is named by 71 ° C type and the other is 79 ° C. z Inspecting (1) Check the wax pallet and spring for damage. (2) Put the thermostat in a container of Bar Thermometer water, then heat the water slowly and check temperature with a thermometer. If the valve lift is Wood plate 0.1 mm (starting to open) at temperature of 71 ° C and 8 mm or more (opening wide) at temperature EFM2055I of 85 ° C, the thermostat is normal.
Maintenance of Major Components - 127 - Item Specifications In moderate climates In tropical climates Generator Type Wax-pallet type Wax-pallet type Open at 71 °C 79 °C Open wide at 85 °C 93 °C Valve lift 8 mm or more 8 mm or more