Thermostat: Service and Repair

REMOVAL AND INSTALLATION

REMOVAL SERVICE POINT
[[A]] RADIATOR UPPER HOSE DISCONNECTION





Make mating marks on the radiator hose and the hose clamp.
Disconnect the radiator hose

INSTALLATION SERVICE POINTS
]]A[[ THERMOSTAT INSTALLATION

CAUTION: Make absolutely sure that no oil is adhering to the rubber ring of the thermostat. In addition, be careful not to fold over or scratch the rubber ring when inserting. If the rubber ring is damaged, replace the thermostat. Install the thermostat being careful not to fold over or scratch the rubber ring.

]]B[[WATER OUTLET FITTING INSTALLATION
1. Remove sealant from the water outlet fitting and cylinder head surfaces





2. Apply a bead of the sealant to the cylinder head mating surface of the water outlet fitting as shown
Specified sealant: 3M(TM) AAD Part No. 8672, 3M(TM) AAD Part No. 8679/8678 or equivalent

NOTE: Install the water outlet tiffing within 15 minutes after applying liquid gasket.

3. Install the water outlet fitting to the cylinder head

CAUTION: Then wait at least one hour. Never start the engine or let engine oil or coolant touch the adhesion surface during that time.

4. Tighten the water outlet fitting mounting bolts to the specified torque
Tightening torque: 10 ± 1 Nm (84 ± 13 inch lbs.)

]]C[[ RADIATOR UPPER HOSE CONNECTION





1. Insert each hose as far as the projection of the water outlet fitting.
2. Align the mating marks on the radiator hose and hose clamp, and then connect the radiator hose.

INSPECTION
THERMOSTAT CHECK





1. Immerse the thermostat in water, and heat the water while stirring. Check the thermostat valve opening temperature.
Standard value: Valve opening temperature: 80 ± 1.5°C (176 ± 3°F)





2. Check that the amount of valve lift is at the standard value when the water is at the full-opening temperature.

NOTE: Measure the valve height when the thermostat is fully closed, and use this measurement to compare the valve height when the thermostat is fully open.

Standard value:
Full-opening temperature: 93°C (199°F)
Amount of valve lift: 9.5 mm (0.37 inch) or more