E30 series BMW 3

since 1983-1994 of release

Repair and car operation

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
- 6. Fuel system
   6.2. Specifications
   6.3. Check of system of injection
   6.4. Measuring instrument of a stream of air
   6.5. Throttle branch pipe
   6.6. Regulator of pressure of fuel
   6.7. Nozzle of start-up of the cold engine and thermotimer
   6.8. Check and replacement of nozzles
   6.9. Air proof-reader of idling
   6.10. Order of a decompression of fuel system
   6.11. Check of pressure of fuel
   6.12. The fuel pump, the pump of pumping and the fuel level sensor in a tank
   6.13. Gasoline pipe lines and union
   6.14. Fuel tank
   6.15. Air filter
   6.16. Cable of a drive of a butterfly valve
   6.17. Carburetor
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Good advice


6.17. Carburetor


On early models of considered cars Solex 2B4 carburetors (cars of early release) and Solex 2BE (later release) are established. Both carburetors two-chamber with a falling stream. The drive of a butterfly valve of the primary chamber is provided mechanically, zaslonka of the secondary chamber under the influence of depression in zadrosselny space.

Considered carburetors have two poplavkovy chambers equipped with a float and the needle valve which reduces action of inertial forces when braking or car turn.

The air zaslonka of the primary chamber of the Solex 2B4 carburetor has the thermoelectric drive (a bimetallic plate with electroheating) which works at engine warming up. The thermoelectric drive works together with 2 valves obogatitel of a mix who work depending on temperature of cooling liquid and sucked-in air.

On the Solex 2BE carburetor the electronic control unit which automatically regulates the carburetor both in a mode of warming up of the engine, and in the course of work after warming up is provided. The block is mounted in the right part of a forward partition of salon.


1. Remove the air filter.
2. Disconnect from the carburetor a cable of a drive of a butterfly valve.
3. On cars from an automatic transmission disconnect a kick-down-mode cable.
4. Designate and disconnect sockets of conducting of the carburetor.
5. Disconnect the conductor of connection with weight on an arm of the device of positioning of a butterfly valve.
6. Designate and disconnect from the carburetor vacuum hoses, (the hose with a white strip is connected to a tee).
7. On the carburetor 24 disconnect from the thermovalve and muffle hoses of cooling liquid.
8. Disconnect a fuel hose.
9. Unscrew 4 bolts and remove the carburetor.
10. If necessary unscrew nuts and remove a heat insulator (on a photo a heatinsulating pro-rate of the carburetor).


Installation is carried out upside-down. Before installation check purity of condensed surfaces of the carburetor. Adjust cables.



Below the description for the Solex 2B4 carburetor is provided. Dismantling procedure for the Solex 2BE carburetor differs nothing.

Type of the top cover from below

Type of the carburetor after cover removal

The removed case of butterfly valves

The bottom view of the case of poplavkovy chambers after removal of the case of butterfly valves

The main jet of the secondary chamber (1) and an obogatitel of a mix at start-up of the cold engine (2)

The main jet of the secondary chamber (at the left) and an obogatitel of a mix at start-up of the cold engine (on the right), screwed in a cover

Shunting air jet (1), air starting jet (2) and the air proof-reader (3)

Arrangement of jets in the top cover

1. Prepare a set of laying and sealants.
2. Wash out the carburetor outside.
3. Hook and remove draft of a drive of the accelerating pump.
4. Unscrew screws of the top cover. The central bolt unscrew a 6-faced key.
5. Hook and remove draft from the plastic lever of an air zaslonka.
6. Remove the top cover and laying.
7. Unscrew the screw of fastening of an arm of the device of positioning of a butterfly valve
8. Disconnect draft of a pneumodrive.
9. Unscrew screws of fastening of the case of a butterfly valve to the case of poplavkovy chambers.
10. Remove intermediate draft of a butterfly valve. If it is not possible, unscrew a nut and disconnect the lever from an axis of a zaslonka of the primary chamber, without allowing violation of installation of a returnable spring.
11. Remove the case of butterfly valves and laying.
12. Beat out axes, remove floats and get needle valves. Store these details so that at assembly to establish on former places.
13. Turn out from the secondary poplavkovy chamber shunting jet, then turn out all jets from a cover, store them so that at assembly to establish on former places.
14. Clear all details and blow channels the compressed air under low pressure.
15. Replace all laying and a sealant (are delivered in ).
16. Before installation of a cover check correctness of position of draft of an air zaslonka.
17. Check and if necessary adjust a float. For this purpose measure distance from the cover plane without laying to the upper edge of a float in the absence of effort from a spring on a ball of the needle valve. This distance is regulated by a podgibaniye of a uvula of a float.
18. Be convinced that in the top part of the accelerating pump the epiploon is established.


Air zaslonka with the thermoelectric drive (24)
1. Be convinced that on a cover and the case of the device of a drive of an air zaslonka there are labels. Otherwise put them.
2. Unscrew 3 screws and get a ring.
3. Remove a plastic cover, having disconnected a bimetallic spring from the lever.
4. Lay under the lever of an air zaslonka a rubber tape, displace the lever of a zaslonka (2) to the right (having pulled for a tape) and a drill (1) diameter of 4,2 mm check a gap between bottom edge of a zaslonka and a carburetor wall. The lever can be displaced also having created depression in a pneumodrive diaphragm.
5. If necessary adjust a gap, rotating the screw on a pneumodrive diaphragm
6. Establish a thermoelectric drive cover upside-down, having combined labels.
Device of positioning of a butterfly valve (24)
7. Measure length of a spring of the device (the provision of a butterfly valve corresponds to idling). The length should be 23 (1,0) mm. If necessary adjust, rotating a nut.
8. On the idle engine check a course of the lever of a drive of a zaslonka from the restrictive screw to the lever which should be 5,0 (0,5) mm. If necessary adjust, having released a lock-nut and rotating draft of a diaphragm. After adjustment tighten a lock-nut.
9. Adjustment of the device of positioning of a butterfly valve on carburetors 2 is carried out in car-care center (independent adjustment is possible only in the presence of special equipment and skills).