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, and disconnect the water inlet from the water inlet housing.
3. REMOVE THERMOSTAT
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
Install the water inlet with the 3 nuts.
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