Thermostat: Service and Repair

REMOVAL

HINT: Removal of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.

1. DRAIN ENGINE COOLANT





2. DISCONNECT WATER INLET FROM WATER INLET HOUSING
Remove the 3 nuts holding the water inlet to the inlet housing, and disconnect the water inlet together with the radiator hose from the water inlet housing.
3. REMOVE THERMOSTAT FROM WATER INLET HOUSING
a) Remove the thermostat.
b) Remove the gasket from the thermostat.

INSPECTION
INSPECT THERMOSTAT





HINT: The thermostat is numbered with the valve opening temperature.





a) Immerse the thermostat in water and gradually heat the water.
b) Check the valve opening temperature.
Valve opening temperature: 80 - 84°C (176 - 183°F)
If the valve opening temperature is not as specified, replace the thermostat.





c) Check the valve lift.
Valve lift: 10 mm (0.39 inch) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.
d) Check that the valve is fully closed when the thermostat is at low temperatures (below 40°C (104°F)).
If not closed, replace the thermostat.

INSTALLATION
1. PLACE THERMOSTAT IN WATER INLET HOUSING
a) Install a new gasket to the thermostat.
b) Insert the thermostat into the water inlet housing with the jiggle valve facing straight upward.





HINT: The jiggle valve may be set within 30° of either side of the prescribed position.

2. INSTALL WATER INLET
Torque: 19 Nm (195 kgf-cm, 14 ft. lbs.)
3. FILL WITH ENGINE COOLANT
4. START ENGINE AND CHECK FOR COOLANT LEAKS
5. RECHECK ENGINE COOLANT LEVEL