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 tightness of the float and the condition of the needle valve, replace the defective parts.
Cold idle adjustment
Warm up the engine to operating temperature.
Connect a tachometer.
Remove the air filter and close the vacuum supply hose to the thermostat with a plug.
Disconnect the tee of the vacuum hose connecting the three-piece pneumatic throttle actuator of the 1st chamber and the pneumatic valve with a thermal time switch.
Close the hose coming from the pneumatic actuator of the throttle valve of the 1st chamber with a plug.
Check and, if necessary, adjust the crankshaft speed within 3000±200 rpm using the screw on the throttle control lever of the 1st chamber, based on the movable rod of the pneumatic actuator.
The arrow shows the adjusting screw of the starting clearance of the first stage of the air damper of the Pierburg 2E2 carburetor
After adjustment, lock the stop screw with a drop of paint.
Air damper starting gap adjustment
Remove the starter cover.
Pull down the choke control lever and lock it in this position.
Connect a vacuum gauge and a vacuum pump to the air damper actuator.
Create a vacuum of 100 mbar in the air damper actuator.
Check the tightness of the air damper actuator, the vacuum in which should not fall 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 the starting clearance of the first stage of the air damper with a set of feelers, which should be 1.8±0.15 mm.
If necessary, set the correct gap with the air damper diaphragm travel adjustment screw (see photo).
Close the atmospheric opening of the pneumatic actuator of the air damper with a plug, create a vacuum of 200 mbar in it. If it persists for at least 1 min, then the pneumatic actuator is tight
Measurements with a set of probes are the starting clearance of the second stage of the air damper, which should be within 4.0±0.15 mm for vehicles with a manual gearbox and 3.9±0.15 mm for vehicles with automatic transmission.
The shooter shows a device for adjusting the starting clearance of the second stage of the air damper of the Pierburg 2E2 carburetor
Adjust, if necessary, the nominal clearance with the adjusting screw on the end of the air damper rod (see photo).
Checking the throttle actuator of the 2nd chamber
Connect a vacuum gauge and a vacuum pump to the throttle actuator of the 2nd chamber and create a vacuum of 50 mbar in the pneumatic actuator. If it does not fall within 2 minutes, then the pneumatic actuator is tight.
Fully open the throttle valve of the 1st chamber, maintaining a vacuum of 50 mbar in the pneumatic actuator of the throttle valve of the 2nd chamber.
Make sure that the throttle valve of the 2nd chamber is fully open.
Throttle opening adjustment of the 1st chamber
The throttle position of the 1st chamber is adjusted at the factory, but in the event of a violation of the adjustment, it can be restored as follows:
- connect the vacuum pump to the pneumatic actuator of the throttle valve of the 1st chamber and close the atmospheric opening of the pneumatic actuator with a plug (see photo);
- turn the cam of the heating system so as to release the throttle valve of the 1st chamber and set it to the closed position;
- apply a vacuum to the pneumatic drive, sufficient for the maximum retraction of the throttle valve stop of the 1st chamber,
- set the throttle valve of the 1st chamber to the closed position.
- unscrew the throttle stop screw. until it moves away from the 1st chamber throttle control lever, then screw in the stop screw until it touches the lever.
- tighten the stop screw an additional 1/4 turn and lock it in this position.
Adjustment of the ajar throttle valve of the 1st chamber and the position of the throttle valve pneumatic actuator rod position of the 1st chamber at forced idle: 1 - pneumatic actuator of the throttle valve of the 1st chamber; 2 - tee of the vacuum hoses of the pneumatic actuator of the throttle valve of the 1st chamber and the pneumatic valve with a thermal time relay; 3 - movable rod of the throttle valve actuator of the 1st chamber; 4 - restrictive screw throttle; 5 - adjusting screw for the protrusion of the throttle actuator rod of the 1st chamber at forced idle
Throttle opening adjustment of the 2nd chamber
The throttle position of the 2nd chamber is adjusted at the factory, but in case of misadjustment, it can be restored on a previously removed carburetor as follows:
- fully open the throttle valve of the 1st chamber and fix it in this position;
- set the throttle control lever of the 2nd chamber to the closed position;
- unscrew the restrictive screw of the throttle valve of the 2nd chamber so that it moves away from the stop. Then screw in the stop fork until it just touches the stop;
- tighten the stop screw another 1/4 turn and lock it in this position,
- return the throttle valve of the 1st chamber to the closed position;
- measure the free play of the throttle control lever of the 2nd chamber on the fork of its drive, which should be 0.4±0.1 mm on the inside and 1.0x0.1 mm on the outside;
- adjust, if necessary, the correct amount of free play of the lever by bending the ends of the fork.
Accelerator pump adjustment
Remove the carburetor.
Fully quench the movable rod of the pneumatic throttle valve of the 1st chamber, turn the cam of the heating system so as to release the throttle valve of the 1st chamber and open it completely.
Place a beaker under the carburetor.
Slowly fully open and close the throttle valve of the 1st chamber, thereby activating the accelerator pump.
Measure the amount of fuel in the beaker and compare with the nominal capacity of the accelerator pump (see subsection («Detailed Specifications»).
Achieve desired performance as needed by moving the actuator cam on the 1st chamber throttle control lever.
Checking the operation of the throttle actuator of the 1st chamber at forced idle
Disconnect the vacuum hoses from the pneumatic actuator.
Connect the vacuum pump in place of the hose going through the tee from the pneumatic valve with a thermal timer (see photo).
Create a vacuum in the pneumatic actuator to simulate its operation at idle.
Measure the value of the output of the movable rod of the pneumatic actuator relative to the edge of the guide sleeve, which should be 15 mm.
Increase the vacuum in the pneumatic drive to simulate its operation at forced idle.
Measure the amount of stem extension relative to the edge of the guide sleeve, which should be 10 mm.
Warm engine idle adjustment
Engine idle adjustment should be done with the engine warm (with fully open air damper) with the correct ignition timing and with the current consumers switched off. Connect a tachometer.
With the thrust screw of the throttle control lever of the 1st chamber, resting on the movable rod of the throttle valve pneumatic drive of the 1st chamber, set the engine crankshaft speed within 750±50 rpm.
Pierburg 2E2 carburetor idle adjustment screws: 1 - thrust screw of the throttle control lever of the 1st chamber (determines the amount of idle mixture); 2 - quality adjusting screw (composition) mixtures
Check the carbon monoxide content with a gas analyzer (SO) in the exhaust gases and, if necessary, adjust it.
Remove the air filter cover and disconnect the crankcase exhaust hose.
Adjust the engine idle speed as described above.
Adjusting screw quality (composition) mixture, achieve a CO content within 1.0±0.5%, and when the screw is screwed in, the combustible mixture is enriched, and vice versa.
Check and, if necessary, restore the engine idle mode to 750±50 rpm.
Note. During maintenance of the Pierburg 2E2 carburetor, in order to more accurately adjust the CO content, it is recommended to replace the perforated emulsion tubes with slotted ones supplied as spare parts. In this case, it is necessary to replace the seal above the emulsion tube.
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