Adjustment on the removed carburetor
Fully move the choke control lever and make sure that the choke is fully closed.
Measure with a drill from the side of the gap of the idle speed transition system the amount of opening of the throttle valve, which should be in the range of 0.6-0.7 mm. If necessary, obtain the required amount of opening with stop screw 1 (see photo) throttle valve.
On-vehicle adjustment
Fully move the choke control lever and make sure that the choke is fully closed.
Start the engine and check the fast idle speed, which should be between 3600-4000 rpm.
If the engine mode does not fit within the specified limits, set the required speed of the engine crankshaft at accelerated idle speed with the stop screw 1 of the throttle valve.
Checking and adjusting the starting gap of the air damper on the car
Checking and adjusting the starting clearance of the air damper should only be carried out with a fully functional air damper pneumatic drive. To do this, make sure that the pneumatic drive is tight by creating a vacuum in it, which should not change.
Remove air filter.
Move the choke control lever all the way down and make sure it is fully closed.
Start the engine and check the choke start gap by inserting a drill bit between the bottom edge of the choke and the carburetor wall. The starting gap should be in the range of 4.25-4.75 mm. If necessary, set the required starting clearance with the adjusting screw 1 (see photo) opening the air damper.
Choke Cable Adjustment
Loosen the cable fastener.
Tighten the cable fastening tab so that the distance between the tab and the end of the cable sheath (size «X», see photo) was in the range of 25-30 mm.
Insert a 4 mm drill bit between the choke control on the instrument panel and the threaded end of the drive cable, then tighten the cable end pinch bolt.
Remove the drill and check that the required working clearance and tension of the choke cable are present.
Adjusting the fuel level in the float chamber
The fuel level in the float chamber can be adjusted directly on the vehicle or on the removed carburetor.
Remove the carburetor cover, put it in a vertical position and measure the distance between the surface of the cover with the gasket and the lowest point of the float, which should be 8 within 23.5-24.0 mm.
The check can also be made with the carburetor cap in a horizontal position, turning it over with the float down. In this case, the specified dimension should be 37 mm.
Adjustment is made by bending the float tongue.
Engine idle adjustment
Before adjusting the engine idle, perform the following operations:
- make sure that the air damper is fully open;
- warm up the engine. To do this, let the engine run at about 2000 rpm until the thermostat opens. In no case should you warm up the engine at idle, because. if the engine runs for several minutes at idle, then the measurements of the carbon monoxide content in the exhaust gases will be distorted;
- check the cleanliness of the air filter element and replace it with a new one if necessary (do not remove the air filter when adjusting the engine idle);
- check the operability of the ignition system and the setting of the ignition timing;
- check for air leaks, paying special attention to the connection of the vacuum hoses and the condition of the throttle body gasket;
- make sure that there are no significant exhaust gas leaks in the exhaust tract;
- make sure that powerful current consumers (electric fan of the engine cooling system, headlights, rear window heating element, etc.) off.
Mix quantity screw 1 (see photo) set the engine crankshaft speed within 850-900 rpm.
It is best to adjust the carbon monoxide content (SO) in exhaust gases using a gas analyzer. If not, adjust the CO content as follows;
- make sure that the idle speed is within the specified limits;
- remove the plug of the adjusting screw 2 (see photo) quality (composition) mixtures i. turning the screw to achieve the highest crankshaft speed;
- increase the idle speed by 50 rpm with the adjusting screw 1 of the mixture amount, then reduce the speed with the adjusting screw 2 by the same amount;
- after adjustment, put a new plug on the quality adjusting screw (composition) mixtures.
Adjusting the CO content using a gas analyzer is performed as follows:
- remove the plug of the adjusting screw 2 quality (composition) mixture and, by turning the screw, achieve the CO content in the exhaust gases in the range of 0.5-1.5%;
- if necessary, restore the crankshaft speed to 850-900 rpm with screw 1;
- repeat these operations until the required values of rotational speed and CO content are simultaneously obtained;
- after adjustment, put a new plug on the quality adjusting screw (composition) mixtures.
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