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 PUMP, AND REMOVE THERMOSTAT
a. Remove the 2 nuts holding the water inlet to the water pump, and disconnect the water inlet from the water pump.
b. Remove the thermostat.
c. 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 lift is not as specified, replace the thermostat.





c. Check the valve lift.
Valve lift: 8.5 mm (0.335 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
a. Install a new gasket to the thermostat.
b. Align the jiggle valve of the thermostat with the protrusion of the water inlet.
2. INSTALL WATER INLET
Install the water inlet with the 2 nuts.
Torque: 9.0 Nm (90 kgf-cm, 80 inch lbs.)
3. FILL WITH ENGINE COOLANT
4. START ENGINE AND CHECK FOR COOLANT LEAKS