Fuel tank
The fuel tank is stamped from steel sheet and is placed in front of the rear axle.
Fuel tank capacity, l: 80.
Model engine power system «WH»
Air filter
Air filter with replaceable dry filter element. Brand and type: Mann C 2852/2.
Fuel pump
The fuel pump is driven by the camshaft eccentric.
Fuel supply pressure, kg/cm2: 0.35-0.40.
Keihin carburetor
Keihin carburetor emulsion type, two-chamber, with sequential opening of throttle valves.
The carburetor has two main dosing systems of the 1st and 2nd chambers, an idle system of the 1st chamber with a transition system, a transition system of the 2nd chamber, blocking of the second chamber; power mode economizer, diaphragm accelerator pump, electromagnetic shut-off valve, automatic device for starting and heating of a mixed type, which uses a bimetallic spring with electric heating and circulation of heated liquid from the engine cooling system and uses an air damper pneumatic actuator and an electric inlet pipeline heating device. The carburetor has a pneumatic actuator of the throttle valve of the 1st chamber, which controls its movements in idle and forced idle modes, as well as a pneumatic actuator of the throttle valve of the 2nd chamber, controlled by a thermopneumatic valve and allowing the throttle valve of the 2nd chamber to move only on a hot engine.
Thermo-pneumatic valve for controlling the pneumatic actuator of the throttle valve of the 2nd chamber.
This valve is located on the left side of the cylinder head. Valve closing temperature,°С: < 48.
Valve opening temperature,°С: > 58.
Keihin carburetor calibration data
* Values in parentheses are for vehicles with automatic transmission.
Fuel injection system «K-Jetronic»
On engine models «KR», eWC». «KU» And «RT» applied mechanical system of constant fuel injection «K-Jetronic» Bosch company. Model engines «KU», «KR», «RT» have a forced idle system.
The principle of operation of the fuel injection system
The fuel pump draws fuel from the fuel tank and delivers it to the accumulator. Further, the fuel is supplied under pressure through the filter to the fuel dispenser-distributor.
The pressure disk of the air flow meter fixed on the movable lever, which is installed between the air filter and the throttle valve, deviates depending on the air depression in the engine. The displacement of the pressure disk of the air flow meter is transmitted to the distribution plunger of the fuel dispenser, thereby determining the amount of fuel supplied. The fuel quantity distributor, depending on the position of the pressure plate of the air flow meter, supplies the required amount of fuel to the engine cylinders through the injectors, ensuring the optimal composition of the fuel-air mixture. The fuel dispenser and air flow meter form a mixture regulator.
The pilot pressure regulator reduces pressure on the control plunger during engine warm-up. Reducing the control pressure at the same air flow leads to an increase in the fuel supply and, consequently, to an enrichment of the combustible mixture.
An additional air supply valve installed in the air duct, made parallel to the throttle valve, brings additional air to the engine during cold start and engine warm-up, which leads to an increase in the engine idle speed.
To facilitate starting a cold engine, an electromagnetic starting nozzle is provided, the opening time of which varies depending on the temperature of the coolant by a thermal time switch.
Air filter
Air filter with replaceable dry filter element.
Brand and type: Mann C 22117 or Purflux A 515.
Fuel electric pump
The fuel electric pump is located in the fuel tank in a submerged position.
Brand and catalog number: Bosch 0 580 254 003 or 0 580 254 004.
Productivity at voltage on outputs of 12 V, l/min: 2.0.
Consumed current at a voltage of 12 V at the terminals, no more than, A. 8.5.
Fuel storage
The fuel accumulator is installed under the bottom of the body next to the fuel tank on the right.
Brand and catalog number: Bosch 0 438 170 040 or 0 438 170 041.
Fuel filter
The fuel filter is located under the hood of the power unit compartment.
Brand and catalog number: Bosch 0 450 905 091 or 0 450 905 092.
Damper
Brand and catalog number: Bosch 0 280 161 200; 0 280 161 201; 0 280 161 210 or 0 280 161 211.
Pilot pressure regulator
Brand and catalog Ns: Bosch 0 438 140 094; 0 438 140 095; 0 438 140 130 or 0 438 140 131.
The resistance of the heating winding of the bimetallic spring of the regulator. Ohm: 16-22.
Fuel dispenser
Brand and catalog number: Bosch 0 438 100 127.
Injection nozzles
Brand and catalog number: Bosch 0 437 502 023 or 0 437 502 024.
Volume of injected fuel, ml:
- at idle: 3.0 (2,5) *;
- at full load: 8.0.
Injection start pressure, kg/cm2: 3.0-4.1 (4,3-4,6).
The maximum allowable difference in the pressure of the start of injection between the injection nozzles, kg/cm": 0,6.
* Values in parentheses are for the engine of the model «RT».
Starting nozzle
Brand and catalog number: Bosch 0 280 170 400.
Air flow meter
Brand and part number: Bosch 0 438 120 181 or 0 438 120 182 before July 1983; 0 438 120 023 or 0 438 120 024 after July 1983
Auxiliary air valve
Brand and catalog number: Bosch 0 280 140 112.
Thermal relay for cold start time
Brand and catalog number: Bosch 0 280 130 214 or 0 280 130 223.
Fuel shut-off valve (model engines «KU», «KR» And «RT»)
Brand: VDO.
Operating voltage, V: ~12.
The valve opens at a crankshaft speed of more than 1200-2000 rpm when the throttle is closed on a warm engine.
Adjustment Data
The frequency of rotation of the crankshaft at idle, rpm: 750-850 (on the engine «RT» when the engine is idling, the control valve control current must be within 430±10 mA).
Carbon monoxide content (SO) in exhaust gases at idle,%: 1.0 (model engine «RT»: 1,0±0,2%).
Fuel pressure in the system, kg/cm2:
- model engines «WC», «KR», «KU»: 4,7-5,2;
- model engines «RT»: 5,4-6.2.
control pressure (model engines «WC», «KR», «KU»), kg/cm2:
- with the vacuum hose of the control pressure regulator connected on a warm engine: 3.4-3.8;
- with the vacuum hose of the control pressure regulator disconnected (except for the engine «KR»): 2,75-3,05;
- with the vacuum hose of the control pressure regulator disconnected (engine «KR»): 2.75-3,05,
- on a cold engine at a temperature of 20°C 1.5±0.15.
control pressure (model engine «RT»), kg/cm2:
- with the vacuum hose of the control pressure regulator disconnected on a warm engine: 2.65-2.95;
- with the vacuum hose of the control pressure regulator connected on a warm engine: 4.1-4.3;
- on a cold engine: 1.55-1.75.
Residual fuel pressure in the system, kg/cm2:
- 10 minutes after stopping the engine:
- engines «WC», «KR», «KU»: 1.8-2,6;
- engine «RT»: > 3,4;
- 20 minutes after stopping the engine:
- engines «WC», «KR», «KU»: 1,6;
- engine «RT»: 3,3.
Fuel injection system «KE-Jetronic»
On the engine model «NF* used mechanical constant fuel injection system with electronic pressure control «KE-Jetronic» The system has a forced idle device, an oxygen concentration sensor and a three-way exhaust gas converter.
Fuel electric pump
Brand and catalog Ms Bosch 0 580 254 031 or C 580 254 032.
Fuel filter
The fuel filter is installed in the power unit compartment.
Mark and catalog M; Bosch 0 450 905 145 or C 450 905 146.
Fuel storage
Mark and catalog number Bosch 0 438 70 052 or 0 438 70 053.
Fuel dispenser
Brand and catalog number: Bosch 0 438 01 029.
Fuel pressure control
Brand and catalog Me- Bosch 0 438 61 016 or 0 438 61 017.
Idle speed controller
Brand and catalog Bosch 0 280 140 512 or 0 280 140 513.
Electromagnetic injection nozzles
Brand and catalog Ns: Bosch 0 437 502 032 or 0 437 502 033.
Electronic control unit
The electronic control unit is installed in the passenger compartment in front of the right front door, under the lining.
Brand and catalog number: Bosch 0 280 800 252 or 0 280 800 253.
Data for checking and adjusting
Fuel pressure in the system, kg/cm2 6.1-6.5.
Control pressure at nominal fuel pressure in the system, kg/cm2:
- with the connector of the control pressure regulator connected: 1.2-1.5;
- with disconnected control pressure regulator connector: 0.3-0.5.
Residual fuel pressure in the system, not less than, kg/cm2:
- 10 minutes after stopping the engine: 3.5;
- 20 minutes after stopping the engine: 3.4.
Injector injection start pressure, kg/cm2: 4.3-4.6.
The difference in the volume of injected fuel by injectors, ml:
- at idle speed with an injected fuel volume of 20 ml / min:±3;
- at full load with an injected fuel volume of 80 ml / min:±8.
Duration of fuel injection by the starting injector, s:
- at -20°C: 5-11;
- at a temperature of 0°C: 2.0-2.5;
- at a temperature of 10-20°C: 0.
Control pressure regulator supply current, mA:
- when checking (when the engine is hot and idling): -3 to +3;
- when adjusting (when the engine is hot and idling): 0±1.
Control pressure regulator resistance. Ohm: 17.5-21.5.
Engine idle speed, rpm: 650-790.
Carbon monoxide content (SO) in exhaust gases at idle,%: 0.1-1.1.
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