Intake air circulation diagram:
1 - carburetor; 2 — 1st chamber throttle valve servo drive; 3 — pneumatic drive 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 the glove box); 9 — electropneumatic valve for regulating the ignition timing at idle speed; 10 — ignition distributor sensor; 11 — to the temperature sensor in the car interior.