Intake air circuit diagram:
1 - carburetor; 2 - throttle servo of the 1st chamber; 3 — pneumatic actuator of the throttle valve of the 2nd chamber; 4 - thermostatic valve; 5 - air filter; 5a - brass pipe; 5b - plastic pipe; 6 - air valve of the engine braking system; 7 - filter; 8 - car interior (to glove box); 9 - electro-pneumatic valve for controlling the ignition timing at idle; 10 - sensor-distributor ignition; 11 - to the temperature sensor in the passenger compartment.