4.1.3 Thermostat
·General descriptions and main data
The thermostat maintains a constant temperature of
coolant and 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 directly enter the water pump; when the coolant
temperature rises to open wide 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.
Caution:
There are 3 kinds of thermostats according to
surrounding and operating conditions. One is
named by 71 °C , 79°C type and the other is 83 °C.
·Inspecting
(1) Check the wax pallet and spring for damage.
(2) Put the thermostat in a container of water, then
heat the water slowly and check temperature with a
thermometer. If the valve lift is 0.1 mm (starting to
open) at temperature of 83 °C and 10 mm or more (full
open) at temperature of 95 °C, the thermostat is
normal.
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