Thermostat - Toyota Supra 1990 Manual

CO-8
COOLING SYSTEM - Thermostat
C00227 C00228
THERMOSTAT
REMOVAL OF THERMOSTAT
1 . DRAIN COOLANT
2. REMOVE WATER OUTLET AND THERMOSTAT
(a) Remove the two bolts, water outlet and thermostat
with gasket from the water outlet housing.
(b) Remove the gasket from the thermostat.
INSPECTION OF THERMOSTAT
INSPECT THERMOSTAT
HINT: Thermostat is numbered according to the valve
opening temperature.
(a) Immerse the thermostat in water and heat the water
gradually.
(b) Check the valve opening temperature.
Valve opening temperature:
86 - 90°C (187 - 194°F)
If the valve opening temperature is not within specifica-
tion, replace the thermostat.
(c) Check the valve lift.
Valve lift:
8 mm (0.31 in.) or more at 100°C (212°F)
If the valve lift is less than specification, replace the ther-
mostat.
(d) Check that the valve spring is tight when the ther-
mostat is fully closed.
C00229
If necessary, replace the thermostat.
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C00345
INSTALLATION OF THERMOSTAT
1. INSTALL THERMOSTAT AND WATER OUTLET
(a) Place a new gasket to the thermostat.
(b) Install the thermostat with the jiggle valve facing up-
ward as shown in the illustration, and water outlet
with the two bolts.
Torque: 80 kg-em (69 in.-Ib, 7.8 Nom)
2. FILL WITH COOLANT
3. START ENGINE AND CHECK FOR LEAKS