Removal
Note:
- - Do not remove the thermostat unless necessary.
- - When removing the thermostat, the engine tends to overcool, so do not remove the thermostat even if the engine overheats. The optimum operating temperature of the engine is about 95°C.
Serie A
1 - bypass valve,
2 - gasket,
3 - coolant inlet pipe,
4 - thermostat.
3S-FE, 4S-FE
1 - cooling system inlet pipe,
2 - gasket,
3 - thermostat,
4 - bypass valve.
2C
1 - cooling system inlet pipe,
2 - gasket,
3 - thermostat,
4 - bypass valve.
Removal
1. Drain the coolant.
2. Remove the thermostat.
a) Unscrew the two mounting nuts and disconnect the inlet pipe from the coolant pump.
b) Remove the thermostat.
c) Remove the gasket from the thermostat.
Installation
1. Install the thermostat in the inlet pipe.
a) Install a new gasket on the thermostat.
b) Align the thermostat bypass valve with the protrusion on the inlet pipe.
2. Install the inlet pipe and tighten the two nuts.
3. Fill with coolant.
4. Warm up the engine and check for leaks.
Examination
1. Check the thermostat
Note: as a rule, numbers are marked on the thermostat housing indicating the temperature at which the valve begins to open.
a) Place the thermostat in water and heat it slowly.
b) Check the opening temperature of the thermostat valve.
- Opening temperature - 80-84°C
- Maximum opening temperature is 95°C
If the valve opening temperature does not match, replace the thermostat.
c) Check the valve lift.
- Valve lift - 8.0 mm
If the valve opening temperature does not match, replace the thermostat.
d) Make sure that when the thermostat is cold, the valve is held closed by the spring. If not, replace the thermostat.
