Adjusting the fuel level in the float chamber
Crush the carburetor cap.
Set the carburettor cap at a 45°angle and check the distance between the float and the plane of the float chamber, which should be 27 mm.
To adjust, bend the float arm slightly behind the needle valve fulcrum. The float must rest on the valve needle at a right angle; at the same time, the elastic pusher should not be sunk.
Air damper starting gap adjustment
Disconnect the hoses from the air damper actuator and connect the vacuum pump hose instead.
Set the throttle control sector 8 to the uppermost position by fully pulling out the choke control handle.
Using a vacuum pump, create a vacuum of 500 mbar in the pneumatic actuator and maintain the vacuum in the pneumatic actuator unchanged.
Set lever 1 (see the photo of the air damper drive to the position corresponding to the closing of the air damper, without overcoming the stop force. In this position, use a rod or drill to measure the starting gap of the air damper, which should be in the range of 3.15±0.15 mm.
If necessary, use the adjusting screw 3 on the pneumatic actuator rod to achieve the required I starting gap of the air damper.
Throttle valve adjustment
This adjustment is made without removing the carburetor from the vehicle.
Fully push the choke control knob in.
Connect the vacuum gauge hoses to the ignition distributor vacuum regulator and the carburetor.
Start the engine.
Turning the adjusting screw (see photo) slightly open the throttle, increase the throttle opening until the increase in vacuum stops.
Unscrew the adjusting screw until the minimum vacuum is obtained, then unscrew it another ¼ turn.
Install a new plug on the throttle adjusting screw.
Adjust engine idle.
Throttle start gap adjustment
Remove carburetor.
Pull out the choke control knob fully.
Make sure the label (see photo) on the throttle control sector is opposite the end of the throttle restrictor screw.
Check the throttle valve starting clearance, which
should be within 0.8±0.05 mm. If not, set the proper clearance with the throttle stop screw resting on the throttle control sector.
Install the carburetor in place and check the mode of accelerated idling of the engine at a coolant temperature of at least 60°C, which should be 4300-4700 rpm. Checking and adjusting the performance of the accelerator pump
Place a funnel with a beaker under the carburetor.
Fully push the choke control knob in.
Slowly press the accelerator pedal ten times to failure.
Measure the amount of fuel in the beaker: for ten cycles, the accelerator pump should deliver 15±2 cm3 of fuel.
If necessary, adjust the performance of the accelerator pump by moving the cam of the pump drive lever on the bracket, after loosening the locking screw.
Engine idle adjustment
Idle speed adjustment must be carried out with a warm engine with adjusted clearances in the valve drive mechanism, with the ignition timing correctly set and with the air damper fully open.
Connect the tachometer and gas analyzer in accordance with the operating instructions.
Adjusting screw for the amount of mixture (see photo) set the crankshaft speed within 900-1000 rpm. At the same time, the electric fan of the cooling system should rotate.
Adjusting screw quality (composition) mixtures (see photo) achieve carbon monoxide content (SO) in exhaust gases within 0.5-1.5%.
If necessary, restore the crankshaft speed within 900-1000 rpm, then adjust the CO content again. Carry out these operations until the idle speed and the CO content simultaneously correspond to the data.
The main details of the Solex 1B1 carburetor: 1 - carburetor cover; 3 - pneumatic actuator of the air damper; 4 - locking pin; 5-14 - details of the starting device; 15 - spray accelerator pump; 21 - accelerator pump piston; 25 - carburetor body; 26 - restrictive screw throttle; 29 - amount adjusting screw (composition) idle mixtures; 31-36 — details of the economizer power modes; 37 - electromagnetic shut-off valve idling; 39 - adjusting screw for the amount of idle mixture; 44-57 - throttle control levers and sectors.
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