Checking the fuel level in the float chamber
The position of the float in the float chamber is not adjustable. If a malfunction is detected, check the tightness of the float and the technical condition of the needle valve, replace the defective parts.
Cold idle adjustment
Warm up the engine.
Connect a tachometer.
Stop the engine.
Fully open the throttle by placing the profiled throttle control lever in the appropriate position.
Start the engine without depressing the accelerator pedal.
Check the engine speed, which should be within 36001200 rpm.
Adjust, if necessary, the speed of the crankshaft with the throttle stop screw resting on the profiled throttle control lever.
Air damper starting gap adjustment
Remove the starter cover.
Fully open the throttle by placing the throttle lever on the appropriate profile.
Connect a vacuum gauge and a vacuum pump to the air damper actuator and create a vacuum of 100 mbar in the pneumatic actuator.
If the air damper actuator is sealed, the vacuum should not decrease by more than 5 mbar per minute and decrease to less than 40 mbar.
Bring the vacuum in the air damper actuator to 200-300 mbar.
Measure with a set of feelers the starting gap of the first stage of the air damper, which for cars with a five-speed manual gearbox should be 2.3±0.15 mm, for cars with an automatic gearbox - 2.1±0.15 mm.
Adjust, if necessary, the correct gap with the pneumatic actuator diaphragm stroke adjustment screw located on its cover (see photo).
Close the atmospheric opening of the air damper pneumatic actuator with a plug, create a vacuum of 200 mbar in the pneumatic actuator, which, if the pneumatic actuator is tight, must remain unchanged for at least 1 min.
Use a feeler gauge to measure the starting clearance of the second stage of the air damper, which should be within 3.0±0.15 mm.
If necessary, achieve proper clearance with the adjusting screw on the end of the air damper rod.
Throttle valve adjustment
The throttle position is adjusted at the factory, but if it is out of adjustment, it can be restored as follows:
- remove the throttle stop screw cap;
- connect a vacuum gauge in parallel to the ignition timing sensor-distributor vacuum regulator;
- start and warm up the engine;
- move the throttle control sector away from the idle stop;
- screw in the throttle stop screw so that the vacuum begins to increase;
- unscrew the throttle stop screw until the minimum vacuum is obtained, then unscrew it another half a turn;
- adjust the idle speed of a warm engine, as indicated below;
- install a new plug on the throttle stop screw.
Accelerator pump adjustment
Remove the carburetor.
Fill the float chamber of the carburetor with fuel and place a beaker with a funnel under the carburetor.
Move the throttle control sector away from the idle stop.
Slowly move the throttle ten times from lock to lock, spending about 3 seconds each time, thereby activating the accelerator pump.
Measure the amount of fuel in the beaker: for one cycle, the accelerating pump should supply 0.9±0.15 cm2 of fuel.
If necessary, adjust the performance of the accelerator pump by moving the cam of the accelerator pump drive lever on the bracket, after loosening the lock screw.
Warm engine idle adjustment
The idle speed adjustment of the engine must be carried out on a warm engine with adjusted clearances in the valve drive mechanism, with the ignition timing correctly set.
Connect the tachometer and gas analyzer in accordance with the instructions for use.
Set the crankshaft speed within 750±50 rpm with the adjusting screw for the amount of the mixture.
Adjusting screw quality (composition) mix to achieve carbon monoxide content (SO) in exhaust gases no more than 1.0±0.5%. Restore the crankshaft speed to 750±50 rpm. If necessary, restore the specified CO content.
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