4.4. The thermostat

The thermostat is under the union of a water hose in the case with three unions (fig. 101 see). The overheat gauge is established in the thermostat case. A cover герметизирована a sealing ring of round section. The thermostat it is possible to take out after опорожнения systems of cooling and unscrewing of a cover of the case.

Fig. 101. Details of system of cooling: 1 — bolts; 2 — the connecting union; 3 — a sealing ring of round section; 4 — the thermostat; 5, 6 — to a broad tank; 7 — to the heat exchanger; 8 — from the heat exchanger; 9 — a sealing ring (always to replace); 10 — a pipe of circulation of a cooling liquid; 11 — a safety clip; 12 — the thermostat case; 13 — a bolt, 10 Нм; 14 — the gauge of an overheat with a temperature-sensitive element of the index of temperature; 15 — a stopper; 16 — to the top party of a radiator; 17 — to the bottom party of a radiator; 18 — a collar

Cautiously to take away a hose downwards. To remove a sealing ring from a cover and to examine it.

In need of cover dismantle to disconnect all hoses, to disconnect from a clip a wire of the gauge of an overheat and to disconnect the case. To remove a rubber sealing ring.

Thermostat repair is not provided, therefore in case of its damage it is necessary to replace. We recommend a simple way of check which is spent as follows:

- The thermostat suspended on a wire to lower in a vessel with cold water, as is shown in fig. 108, and to lower in water the thermometer;

Fig. 108. Thermostat check

- Gradually to heat up water and to check up, whether starts the thermostat to open approximately at temperature 87 S.Pri to temperature 102 About the thermostat it should be completely open;

- The thermostat pin should act from the thermostat not less than on 7 mm. If the thermostat is faulty, it is necessary to replace it.

At thermostat installation to use a new lining. The thermostat should be inserted, as is shown in fig. 109. The thermostat crosspiece should enter into gearing with cut in a thermostat cover.

Fig. 109. Thermostat installation

To check up collars of hoses before them again to tighten. The cut spring collars to replace with worm collars. To fill cooling system (подразд. 4.1.1). After that to start up the engine and to check up all connections of system of cooling on absence of leaks.