Water pump, coolant thermostat, oil cooler 4-cylinder petrol and diesel engine
1. Bolt, 20 Nm; 2. Belt pulley; 3. V-belt of water pump and generator; 4. Bolt, 10 Nm; 5. Water pump. Check the ease of rotation of the shaft; 6. Bolt, 20 Nm; 7. Ring; 8. Upper coolant hose; 9. Coolant temperature sensor 2-pole; 10. Thermostat and sensor 4-pole; 11. Ring; 12. Lock washer; 13. To the expansion tank tee; 14. To the heater radiator; 15. From the expansion tank tee; 16. From the heat exchanger; 17. Coolant drain screw, 10 Nm; 18. Sealing ring; 19. Oil radiator; 20. Lower coolant hose; 21. Coolant thermostat; 22. Gasket
Dimensions of cold and hot thermostat
Removal
Attention! The designations of the parts refer to the cooling systems of a 4-cylinder engine. Removal and installation from a 5-cylinder engine is carried out similarly.
1. Place a suitable container under the coolant connection pipe.
2. Unscrew the bolts (4) of the coolant thermostat connecting pipe (21) (see fig. Water pump, coolant thermostat, oil cooler of 4-cylinder petrol and diesel engines).
3. Remove the sealing ring (7).
4. Remove the thermostat (21).
Examination
1. Measure the dimension "a" on the thermostat (see fig. Dimensions of cold and heated thermostat).
2. Warm up the thermostat in a water bath. The thermostat should not touch the walls of the vessel.
3. Monitor the temperature with a thermometer. The thermostat starts to open at about 87°C, and ends at about 102°C.
4. After heating the thermostat to approximately 100°C, dimension "b" should exceed dimension "a" by at least 7 mm.
Installation
1. Replace the sealing ring, install the thermostat and screw on the cover, fill with coolant.
2. Let the engine run until the thermostat opens. Check the cap and coolant hose for leaks.
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