Disconnect the hoses from the thermal vacuum switch.
ring wrench «at 27» flip the switch..
...and take it off.
To remove the recirculation valve..
... disconnect the hose.
ring wrench «at 17» loosen the bolt..
... and remove it together with two sealing copper rings.
head «at 13» unscrew the two bolts securing the recirculation valve to the exhaust manifold.
We remove the valve.
The connection between the valve flange and the exhaust manifold is sealed with a gasket.
To check the function of the valve with a hand vacuum pump (in its absence - by mouth) we apply vacuum to the diaphragm cavity of the valve.
At a serviceable valve, the diaphragm moves..
...and stock.
Dismantling the recirculation pipe is only possible with the intake pipe removed (see Replacing the gaskets of the intake pipe and exhaust manifold of the carburetor engine).
We install the components of the exhaust gas recirculation system in the reverse order. Replace the gasket with a new one.