OHV engine thermostat
1 – body; 2 – warm air supply; 3 – cold air supply; 4 – valve; 5 – lever
Vacuum controlled thermostat (inverted)
1 – warm air supply; 2 – vacuum controlled valve; 3 – cold air supply; 4 – vacuum valve membrane, 5 – vacuum hose; 6 – bimetallic valve for vacuum valve control; 7 – vacuum hose from the intake system
The thermostat maintains the temperature of the air entering the air filter within 25–35°C.
Examination
1. It is necessary to start checking the thermostat on a cold engine. With the engine off, the thermostat flap must be completely closed (1). The flap position can be determined both from the filter side and from the air intake side (2 - cold air intake).
2. Start the engine and check that the damper opens fully (1) at idle speed, opening the supply of air heated by the exhaust manifold (2) to the air filter (3 - vacuum hose, 4 - membrane control device).
3. If the thermostat flap remains closed after starting the engine, the thermostat and membrane should be checked.
The article was taken in its entirety from the specified website www.FordBook.ru