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 condition of the needle valve, replace the defective parts.
Cold idle adjustment
Warm up the engine to operating temperature.
Connect the tachometer according to the instruction manual.
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 actuator of the throttle valve 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 2800-3200 rpm using the screw on the throttle control lever of the 1st chamber, based on the movable rod of the pneumatic actuator.
After adjustment, lock the stop screw with a drop of paint.
Scheme of the Pierburg 2E2 carburetor when starting a cold engine:
1 - air damper;
2 — throttle valve of the 1st chamber;
3 — throttle actuator of the 1st chamber;
4 — a rod of a pneumoactuator of a butterfly valve of the 1st chamber;
5 - heat-power element;
6 - pneumatic actuator of the air damper.
Air damper starting gap adjustment
Remove 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 pneumatic drive, 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 pneumatic actuator of the air damper to 200-300 mbar.
Use a feeler gauge to measure the starting clearance of the 1st air damper stage. On vehicles with a DT engine with a manual gearbox, the clearance must be within 2.3±0.15 mm, and with an automatic gearbox, within 2.7±0.15 mm. On vehicles with a DS engine, it should be within 1.8±0.15 mm.
If necessary, set the correct gap with the air damper diaphragm stroke 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.
Use a set of feeler gauges to measure the starting gap of the second stage of the air damper, which on a car with a DT engine with a manual gearbox should be within 4.7±1.5 mm, and with an automatic transmission - within 5.7±0.15 mm. On vehicles with a DS engine with a manual gearbox, it should be within 4.0±1.5 mm, and with an automatic transmission - in the range of 3.9±0.15 mm.
If necessary, adjust the gap 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 opened.
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 throttle valve opening cam of the 1st chamber 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 so that it moves away from the throttle control lever of the 1st chamber, then screw in the stop screw until it touches the lever;
- turn the stop screw another ¼ turn and lock it in this position.
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 limit screw so that it barely touches the stop;
- tighten the limit screw another ¼ 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 1.0±0.1 mm on the outside;
- if necessary, adjust the free play of the lever by bending the ends of the fork.
Accelerator pump adjustment
Remove carburetor.
Fully sink the movable rod of the pneumatic throttle valve of the 1st chamber, turn the cam of the slightly opening throttle valve of the 1st chamber so as to release the throttle valve of the 1st chamber and fully open it.
Place a beaker under the carburetor.
Smoothly fully open and close the throttle valve of the 1st chamber, thereby activating the accelerator pump.
Measure the amount of fuel in the beaker, which for cars with a DT engine should be within 1.0±0.2 cm, for cars with a DS engine - within 1.1±0.15 cm.
To achieve the required performance, if necessary, by moving the drive cam on the throttle control lever of the 1st chamber.
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 to the 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 actuator 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 the tachometer according to the instruction manual.
With the stop screw of the throttle control lever of the 1st chamber, resting on the movable rod of the throttle valve actuator of the 1st chamber, set the engine crankshaft speed within 700-800 rpm.
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 in the range of 0.5-1.5%, 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 700-800 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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