Thermostat: Service and Repair
THERMOSTATREMOVAL AND INSTALLATION
Pre-removal & Post-installation Operation:
Removal Steps 1-5:
REMOVAL SERVICE POINT
[A] RADIATOR LOWER 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 adheres to the rubber ring of the thermostat. Also do not fold or scratch the rubber ring during installation.
Install the thermostat so that the jiggle valve is facing straight up. Be careful not to fold or scratch the rubber ring.
]B[ RADIATOR LOWER HOSE CONNECTION
1. Insert each hose as far as the projection of the water inlet 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: 76.5 ± 1.5° C (170 ± 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: 90° C (194° F)
Amount of valve lift: 8.5 mm (0.33 inch) or more