Cleaning and carburetor adjustment. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
4.1. General information
4.2. Pressure removal in system of injection of fuel
4.3. Check of pressure of fuel / fuel pump
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
4.5. Repair and replacement of fuel lines and connectors
4.6. Removal and installation of a fuel tank
4.7. General information about cleaning and repair of a fuel tank
4.8. Removal and air purifier installation
4.9. Check, adjustment and replacement of a cable of an accelerator
4.10. General information about the carburetor
4.11. Removal and carburetor installation
4.12. Cleaning and carburetor adjustment
4.13. General information about fuel injection
4.14. Systems of injection of fuel
4.15. Check of functioning of system of injection of fuel
4.16. Functioning check, removal and installation of a measuring instrument of a stream of air
4.17. Functioning check, removal and installation of the case of a throttle
4.18. Check of functioning and replacement of a regulator of pressure of fuel
4.19. Check of functioning and replacement of an injector of cold start and temperature switch
4.20. Check of functioning and replacement of fuel injectors
4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
4.22. Search of malfunctions of system of injection of fuel
4.23. Diagnostics of malfunctions of a power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions
 








4-12-ochistka-i-regulirovka-karbyuratora.html

4.12. Cleaning and carburetor adjustment

In this section procedure for the carburetor 2В4 is described. Procedure for the carburetor 2 - is similar.

Cleaning

 PERFORMANCE ORDER

  1. Get for the carburetor a full set of laying and epiploons.
  2. Wash up external surfaces of the carburetor.
  1. By means of a screw-driver unhook from the lever of a throttle of the primary chamber draft of the accelerating pump (it is shown by an arrow).
  1. Unscrew bolts of fastening of a cover to the main case. The otvorachivaniye of the central bolt will need a prutkovy key.
  1. Unhook from the plastic lever of an air zaslonka draft (it is shown by an arrow).
  1. Disconnect from the main case a cover and remove laying.
View of a cover from within.
View of the carburetor without a cover.
  1. Unscrew the screw of fastening of an arm of a drive of a throttle to the throttle case. (it is shown by an arrow).
  1. Disconnect from the lever of a throttle of the secondary chamber a rod of a vacuum drive.
  1. Unscrew screws of fastening of the case of a throttle to the main case.
  1. Unhook intermediate draft of a throttle. If it appears inconvenient, unscrew a nut and disconnect from an axis of a throttle of the primary chamber the lever, having taken measures not to damage a returnable spring.
  1. Disconnect from the main case the case of a throttle and remove laying.

The bottom view on the main case without the throttle case - pay attention to laying:

  1. Having overturned a cover, вытолкните axes of floats, remove floats...

... also take needle valves - keep them according to an arrangement.

  1. Turn out from the secondary poplavkovy chamber a fuel jet of direct giving.

... then similarly turn out jets from a cover - keep them according to an arrangement.

Secondary main jet (1) and a fuel jet of TM (thermo - a starter) (2).
Secondary main jet (at the left) and a fuel jet of TM (on the right), wrapped in a cover.
Secondary air jet of direct giving (1), air jet of TM (2) and correcting air jet (3).
The provision of jets in a cover (are shown by shooters).
  1. Clear all components and blow air of low pressure internal channels.
  2. Assembly is return to dismantling, however, pay attention to the next moments:
    • Establish new laying and epiploons from a repair set.
    • Before cover installation, check, that draft of an air zaslonka was correctly connected to the lever.
    • Check and if necessary adjust installations of floats. Overturn a cover and check distance from a being interfaced surface (without laying) to float top, having convinced that the podpruzhinenny ball of the needle valve is not pressed. Pay attention that this distance not identical to primary and secondary floats (look the Size table and adjusting data at the end of the Management). If adjustment is required, bend the float lever as it is required.
    • Be convinced that in the top part of the accelerating pump the epiploon is established.

Adjustment

Adjustments of turns of idling and quality of a mix are stated in Head Routine maintenance of the car.

Automatic air zaslonka (2В4)

 PERFORMANCE ORDER

  1. Check, that labels of combination of the case and a cover of an automatic air zaslonka are well distinguishable; if is not present, put new labels.
  1. Unscrew three screws and take a metal ring.
  1. Remove a plastic ring, at the same time disconnecting from a control lever a bimetallic spring.
  1. Fasten to the lower part of a control lever a rubber tape (2). Press the lever to the right and a drill in diameter of 4.2 mm (1) check distance between bottom edge of an air zaslonka and a carburetor wall. For lever moving periodically influence a vacuum drive a razryazheniye.
  1. If adjustment is necessary, rotate it is shown by an arrow) on the end of a vacuum drive.
  1. Upside-down establish a cover, having convinced that labels are combined.

Throttle drive (2В4)

 PERFORMANCE ORDER

  1. At being in the provision of idling a throttle check, that the length of a spring made 23.0 ±1.0 mm. If differently, adjust a nut.
  2. When the razryazheniye is absent (the engine does not work), check, that the course of the lever measured between the lock screw and the lever, made 5.0 ±0.5 mm. If necessary weaken a lock nut and rotate a diaphragm rod. After adjustment tighten a lock nut.

Throttle drive (2)

For difficult adjustment of the carburetor 2 special tools are required. Therefore it is necessary to charge such work to the dealer of BMW.


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