Thermostat mounted on the bottom of the engine (see illustration 8.0). When replacing the thermostat, the O-ring of the thermostat housing or water pump housing must also be replaced.
1. Drain all coolant.
2. Four-cylinder petrol and diesel engines. Remove the engine mudguard.
3. Disconnect the bottom hose from the water pump housing.
4. Turn out two bolts of fastening of a cover of the case of the thermostat.
5. Remove the cover and remove the thermostat.
6. Five-cylinder engine. Remove the two cover screws on the thermostat housing (see illustration).
7. Move the cover aside and remove the thermostat.
8. Six-cylinder engine. Remove the ribbed belt and belt tensioner.
9. Remove the toothed belt guard. Do not remove the toothed belt.
10. Disconnect the lower radiator hose from the thermostat housing.
11. Turn out two bolts of fastening of a cover on the thermostat case (see illustration).
12. Carefully lift the toothed belt over the thermostat housing and remove the cover.
13. Remove the thermostat from the housing.
Installation
When installing a new thermostat, the smaller diameter gasket should face the engine.
On a six-cylinder engine, the vent valve on the outer ring of the thermostat must be facing up (see illustration 8.0a).
14. Replace the O-ring with a new one.
15. Tighten the bolts on the thermostat housing or on the water pump housing with a torque of 10 Nm.
Examination
The thermostat can be tested with a thermometer. The thermostat should begin to open when the coolant temperature is approximately 87°C. At about 102°C, the thermostat should open fully. The length of the opening stroke of the thermostat is 7-8 mm.
16. Remove the thermostat.
17. Dip the thermostat in a container of water and heat the water.
18. See if the thermostat begins to open when the water is heated to a temperature of 87°C. During this test, it is impossible to achieve full opening of the thermostat, because. water boils at a temperature of 100°C, but if the thermostat is working, you can see how it continues to open.
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