Fig. 7.31. Vacuum ignition advance regulator control device.
1 — fuel accumulator; 2 - thermostatic three-way valve; 3 — vacuum delay/amplification valve.
The delay is achieved by a valve, the operating principle of which is illustrated in Fig. 7.32.
Fig. 7.32. Operating principle of the vacuum delay/amplification valve.
A - in delay mode; B - in the free vacuum transfer mode; 1 — check valve opening; 2 - check valve; 3 — nozzle.
After the engine warms up, the vacuum from the throttle space is transmitted directly to the vacuum regulator. The delay time for creating a vacuum of 200 mm. r. g. from 1 to 9 sec, the catalog number of the delay valve is D 3 DE — 12 F 189 — AB, the color of the valve is black-brown.
The operating mode of the device is determined by a three-way thermostatic valve (Fig. 7.33) depending on the temperature of the coolant passing through the liquid chamber of the carburetor.
Fig. 7.33. Three-way thermostatic valve.
1 - liquid chamber; 2 — plunger; 3 - upper branch pipe; 4 - middle branch pipe; 5 - lower branch pipe.
The vacuum is transmitted to the three-way valve through the fuel accumulator 1 (Fig. 7.31), which holds back the gasoline vapors and thus protects the diaphragm of the vacuum regulator from their harmful effects. The middle branch pipe of the three-way valve is connected to the intake manifold. The upper one connects the vacuum regulator to the middle branch pipe (intake manifold) through a valve on a cold engine, the lower branch pipe connects the vacuum regulator directly to the middle branch pipe when the coolant reaches operating temperature.