Checking the fuel level in the float chamber
The position of the float in the float chamber is not adjustable. If a malfunction is found, check the float for leaks, check the operation of the needle valve, replace the defective parts.
Adjustment of the opening of the throttle valve of the 1st chamber when the engine is idling cold
To adjust without removing the carburetor from the engine, warm up the engine to operating temperature.
Remove the air filter.
Disconnect the vacuum supply hose from the throttle valve actuator of the 1st chamber.
Attach a control tachometer.
Start a cold engine and let it idle.
Check the crankshaft speed on the tachometer, which should be equal to 3500 rpm.
If necessary, adjust the idle speed of the crankshaft of the cold engine by moving the forked lever of the throttle valve drive of the 1st chamber.
Remove the carburetor and check the opening of the throttle valve of the 1st chamber, which on cars with a manual gearbox should be within 1.3-0.1 mm, on cars with automatic transmission - 1.5±0.1 mm.
In case of deviation from the norm, achieve the proper opening of the throttle valve of the 1st chamber by acting on the forked lever of its drive.
Adjustment of the opening of the throttle valve of the 1st chamber when the engine is idling cold
Throttle start gap adjustment
Remove the carburetor and disconnect the air drive rod from the throttle valve of the 1st chamber.
Insert a 9.5 mm drill bit between the carburetor body and the throttle control lever operated by the automatic starter.
If necessary, achieve proper clearance by varying the length of the auto starter drive stem.
Use a feeler gauge to measure the throttle starting gap, which should be 0.6±0.07 mm on vehicles with manual transmission and 0.7±0.07 mm on vehicles with automatic transmission.
In the event of a deviation from the norm, set the required starting clearance by changing the position of the thrust roller of the throttle control lever.
Adjusting the starting clearance of the throttle valve of a cold engine: A - adjustment of the output of the drive rod of the automatic starting device; B - adjusting the position of the thrust roller
Air damper starting gap adjustment
Remove the air filter.
Remove the automatic starter cover.
Set the choke control lever to the stop position by turning it counterclockwise and lock it in this position.
Set the air damper rod to the stop position.
Measure the starting gap of the air damper with a set of feeler gauges, which should be 5.6±0.15 mm.
Adjust, if necessary, the starting clearance of the air damper by bending the stop lever.
Throttle opening adjustment of the 2nd chamber
Remove the carburetor.
Turn out the restrictive screw of the throttle valve of the 2nd chamber so that it moves away from the bracket. Tighten the stop screw until it touches the bracket, then tighten it an additional 1/2 turn.
Lock the 2nd chamber throttle stop screw with a drop of paint.
After installing the carburetor, adjust the idle speed of the engine.
Air damper starting gap adjustment
Adjusting the performance of the accelerator pump
Remove the carburetor and place a beaker with a funnel under it.
Move the automatic starter control lever to the open side.
Take the throttle control lever of the 1st chamber away from the rod and pneumatic actuator.
Install a 12 mm rod between the carburetor body and the 1st chamber throttle control lever, actuated by the automatic starter.
Slowly fully open and close the throttle valve of the 1st chamber, thereby activating the accelerator pump.
Measure the amount of fuel leaking into the beaker and compare it with the norm (see subsection «Detailed Specifications»).
In case of deviation from the norm, adjust the required performance of the accelerator pump by changing the stroke of the accelerator pump drive lever, slightly bending the stop lever.
Accelerator pump adjustment
Warm engine idle adjustment
Before adjusting the idle speed, check that the ignition timing is set correctly and turn off all electrical consumers.
Warm up the engine to operating temperature.
Attach a control tachometer.
Adjust the idling speed of the engine crankshaft by turning the stop screw of the throttle control lever of the 1st chamber, resting on the lever of the pneumatic throttle valve of the 1st chamber.
Connect the gas analyzer according to the operating instructions.
Remove the air filter cover and disconnect the crankcase exhaust ventilation hose.
Check and, if necessary, adjust the CO content with the quality screw (composition) idle mixture.
Carbon monoxide regulation (SO) in exhaust gases
Check and, if necessary, readjust the engine idle speed.
Engine idle speed adjustment
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