Fuel pump
The mechanical fuel pump is driven by the intermediate shaft eccentric.
Characteristic | Meaning |
Vacuum pressure when the starter is turned on, kg/cm2 | 0,332—0,465 |
| 0,095 |
Discharge pressure when the starter is turned on, kg/cm2 | 0,25—0,38 |
| 0,05 |
Stromberg carburetor
On engines M 102.920 and 939, M 115.954, a single-chamber horizontal carburetor with a constant vacuum Stromberg 175 CDT was installed.
Calibration data
Characteristic | Meaning |
Dispensing needle marking | UC |
Marking of the main fuel jet | 100 |
Idle fuel jet marking | 50 |
Idle air jet marking | 115 |
Needle valve hole diameter, mm | 2,25 |
Starter cover marking | 200 |
Fuel level in the float chamber, mm | 18—19 |
Float mass, g | 11,8—13 |
Brand of oil in the piston shock absorber | ATF |
Piston shock absorber capacity, cm3 | 30 |
Needle valve gasket thickness, mm | 1,5 |
Starting clearance of the air damper, mm | 5,3±0,3 |
Fuel supply by the accelerator pump for 1 cycle, cm3 | 1,9±0,15 |
Engine speed with vacuum regulator hose disconnected, rpm | 1250±50 |
Clearance between the lever and the adjusting screw of the vacuum regulator, mm | 0,5 |
Frequency of rotation of a cranked shaft idling, rpm | 800±50 |
Carbon monoxide content in exhaust gases, % | 1,0±0,5 |
Speed of the crankshaft at accelerated idling at an oil temperature in the engine of 75-85°C and the position of the starting device sector on the 2nd groove profile, rpm | 1700±100 |
Carbon monoxide content (SO) in exhaust gases at accelerated idling at an oil temperature in the engine of 75–85°C and the position of the starting device sector on the 2nd groove profile, % | 6±1 |
Time delay of the electromagnetic shut-off valve, s | 6—16 |
Carburetor Solex DVG type 4A1
On engines M 123.920, M 123.921, M 115.938 and M 110.923, a Solex DVG type 4A1 carburetor was installed. Emulsion-type carburetor, two-chamber, with sequential opening of throttle valves, with automatic starter and thermostatic auxiliary starter (to start a warm engine). At forced idle, the forced idle economizer is activated.
Characteristic | Meaning |
Carburetor index | |
| E 17481 (E 17703) * |
| E 17482 (E 17704) |
| E 17603 |
* In parentheses is the index of carburetors installed on models with an automatic transmission without a vacuum ignition control.
Since the 1980 model year, some characteristics of the Solex 4A1 carburetor have been changed.
Characteristic | Meaning |
Fuel supply by the accelerator pump for 1 cycle, cm3 | 0,7±0,15 |
Idle air jet marking | 125 |
accelerator pump atomizer marking | 50 |
Starting clearances of the air damper, mm | |
| 1,1 |
| 4,2±0,2 |
Air damper opening, mm | 0,3—0,8 |
Solex 4A1 carburetor calibration data
Index | Automobile model «200» | |
1st camera | 2nd chamber | |
Diffuser diameter, mm | 20 | 54 |
Needle valve hole diameter, mm | 2,0 | |
Main dosing system | ||
| x 97.5 | B5* |
| 2,147 | 3,747 |
Idle system | ||
| 42,5 | — |
| 120 | — |
accelerator pump | ||
| 0,6±0,15 | |
Float mass, g | 6,8±0,35 | |
Starting gaps, mm | ||
| 3,2 | — |
| 4,2±0,2 | |
| 2,9±0,2 | |
Carbon monoxide content (SO) in exhaust gases | 0,5—1,5 | |
Frequency of rotation of a cranked shaft idling, rpm | 850—950 | |
Index | Automobile model «250» | |
1st camera | 2nd chamber | |
Diffuser diameter, mm | 20 | 54 |
Needle valve hole diameter, mm | 2,0 | |
Main dosing system | ||
| x 97.5 | B7* |
| 2,147 | 3,747 |
Idle system | ||
| 42,5 | — |
| 115 | — |
accelerator pump | ||
| 0,7±0,15 | |
Float mass, g | 6,8±0,35 | |
Starting gaps, mm | ||
| 3,2 | — |
| 4,2±0,2 | |
| 2,9±0,2 | |
Carbon monoxide content (SO) in exhaust gases | 0,5—1,5 | |
Frequency of rotation of a cranked shaft idling, rpm | 850—950 | |
Index | Automobile model «280» | |
1st camera | 2nd camera | |
Diffuser diameter, mm | 20 | 54 |
Needle valve hole diameter, mm | 2,0 | |
Main dosing system | ||
| x 97.5 | B5* |
| 90 | — |
Idle system | ||
| 42,5 | — |
| 110 | — |
accelerator pump | ||
| 0,65±0,15 | |
Float mass, g | 6,8±0,35 | |
Starting gaps, mm | ||
| 3,2 | — |
| 4,2±0,2 | |
| 2,9±0,2 | |
Carbon monoxide content (SO) in exhaust gases | 0,5—1,5 | |
Frequency of rotation of a cranked shaft idling, rpm | 800—900 | |
* Marking needle jet.
Solenoid shut-off valve
Characteristic | Meaning |
Brand and type | Pierburg RE 20 273 |
Valve needle stroke, mm | 2,5±0,05 |
Rated voltage, V | 12 |
Maximum allowable voltage, V | 16 |
Consumed current at a voltage of 12 V, A | 0,25±0,02 |
Vacuum regulator
Characteristic | Meaning |
Brand and type | Pierburg RE 20 464 |
Thermal valve for reducing the toxicity of exhaust gases
Characteristic | Meaning |
Brand and type | Texas Instruments CARP or Pierburg PE 20213 |
Valve opening temperature,°С | 30±3 |
Valve closing temperature,°C | 20±3 |