The principle of operation of the automatic starting device
The principle of operation of the automatic starting device is based on the supply of current to the screened 64 (see picture «The main parts of the Solex 32/32 DIDTA carburetor»,) bimetallic spring, which, as it heats up, acts on the lever 61, connected by an adjustable rod 42 to the throttle actuator of the 1st chamber, as well as on the use of the heat of the coolant circulating through the tubes in the liquid chamber 66. A sealing seal is installed between the liquid chamber and the body of the bimetallic spring gasket 65. In addition, for a short time, current is supplied to the bimetallic spring installed in the housing 46, which ensures the supply of additional air to accelerate the flow of the working mixture.
When the engine is started, voltage is applied to both bimetallic springs and the engine runs at an increased crankshaft speed. After a short period of time, the supply of additional air is blocked. The engine speed decreases, but the mixture remains rich due to the fact that the air damper is held in its initial position by the bimetallic spring of the automatic starter that remains energized.
When the temperature of the coolant reaches 80-90°C, the power circuit of the bimetallic spring is broken by a thermoelectric sensor and the temperature of the spring is further maintained only by the circulation of the coolant.
Carburetor Starting Gap Adjustment
On the carburetor removed from the car, open the throttle valve of the 1st chamber by pressing the levers 6 of its control, and completely close the air damper installed in the cover 52 of the carburetor.
Close the throttle valve of the 1st chamber and release the air damper, thereby bringing the starting device into working condition. The air damper is slightly ajar and sector 11, acting through the rod 43 and relying on the throttle control lever 6 of the 1st chamber, slightly opens the throttle of the 1st chamber. Check the starting gaps of the air damper and the throttle valve of the 1st chamber, which should be within 3.2±0.15 and 0.8±0.05 mm, respectively.
If necessary, set the desired damper starting clearances by changing the length of the connecting rod 42, turning the nut 44 in the connection «D».
Engine idle adjustment
Connect a tachometer and a gas analyzer in accordance with the manufacturer's instructions, connect a vacuum gauge to the negative pressure connection for the vacuum ignition timing controller.
Screw in the adjusting screw 14 of the supply of additional air at idle until it stops.
Set the crankshaft speed in the range of 700-750 rpm with the adjusting screw for the amount of the mixture. In this case, the vacuum should be 1-15 mm Hg.
Adjusting screw 40 quality (composition) mixture, achieve the highest and most stable engine idling speed.
Increase the engine speed to 860-900 rpm by unscrewing the screw 14 for supplying additional air at idle.
Adjusting screw 40 quality (composition) mixture, achieve the highest and most stable engine idling speed.
Measure the content of carbon monoxide (SO) in exhaust gases. Screw in the quality adjusting screw (composition) mixture so that the CO content becomes equal to 1.5%. In this case, the idle speed of the crankshaft will be 800±100 rpm.