Pic. 188. Pump water cooling 2.0-liter engine disassembled: 1 - bolt, 25 Nm; 2 - pulley; 3 - bolt, 10 Nm; 4 - water pump; 5 - gasket, replace; 6 - thermostat; 7 - O-ring, always a replacement; 8 - connecting fitting; 9 - collar; 10 - thermostat housing cover; 11 - V-ribbed belt pulley
Thermostat 6 (pic. 188) located in the water pump housing under cover 10, which has an O-ring.
Remove the thermostat in the following order:
Attention! The thermostat can only be removed when the engine is cold.
- carefully open the expansion tank cap and drain the coolant to at least the level of the thermostat setting (approx. 4 liters of coolant);
- disconnect the hose from the thermostat cover and remove the cover;
- Remove the thermostat from the housing and remove the O-ring from the thermostat cover.
Note. A defective thermostat cannot be repaired, therefore, in the event of a malfunction, it should be replaced.
To check the functionality of the thermostat, proceed as follows:
Pic. 192. Checking the functionality of the thermostat
- hang the removed thermostat on a piece of wire and lower it into a vessel filled with cold water with a thermometer (pic. 192);
- heat up the water gradually. A good thermostat should start to open at around 85°C. At a temperature of 105°C, the thermostat must open completely and its stem must protrude from the housing by at least 7 mm;
- If the thermostat does not meet these requirements, it must be replaced.
When installing a thermostat:
- use the new O-ring;
- check the hose clamp before reattaching it to the hose;
- Pour coolant into the cooling system.
Visitor comments