Valve injectors - removal and inspection
1. Purchase new heat shields for the injectors.
2. Disconnect the high pressure fuel lines. Do not change the shape of the bend of the fuel lines (see illustration).
3. Remove the fuel return hoses.
4. Unscrew the injectors using a 27mm socket or socket wrench.
5. Use a ballpoint pen or a wire hook to remove the heat shields remaining in the injector hole.
6. Install new heat shields (see illustration).
7. Screw in the nozzles and tighten them with a torque of 70 Nm.
8. Reinstall the high pressure fuel lines and tighten them to 25 Nm. Higher tightening torque causes narrowing of the orifice.
Valve injectors installed on cars manufactured before 6/92 are collapsible. The disassembly and assembly of the injectors should be entrusted to a workshop. Double spring nozzles installed since 7/92 are non-separable. In the event of a malfunction, such an injector can only be replaced with a new one (see illustration 4.0).
4.0 Parts of the valve injector for cars manufactured before 6/92
1 - lower part of the nozzle (turnkey for 27)
2 - nozzle body
3 - nozzle needle
4 - fuel return valve
5 - pressure bolt
6 - spring
7 - adjusting washer
8 - upper part of the nozzle (turnkey for 27)
Fuel cut-off valve - check
To shut off the engine, the fuel cut-off valve shuts off the fuel supply to the injectors. If the fuel cut-off valve fails, the engine cannot be started. If the engine does not start, despite the fact that the fuel tank is full and the preheat system is normal, then a valve malfunction may be the cause.
9. First of all, make sure that the fuel cut-off valve power wire is normal.
10. Ask an assistant to turn the key in the ignition, and listen for yourself to see if the fuel cut-off valve is activated. When actuated, the valve makes a rather loud clicking sound. If there is no such sound, then the cause of the malfunction is the lack of power to the valve or in the valve itself.
11. Check the voltage supply to the valve. To do this, turn on the ignition and connect a tester with a diode bulb to the valve contact. If the light comes on, then the valve itself is faulty. Otherwise, the power wire from the ignition switch is faulty. Despite a valve malfunction or interruption in its power supply, the trip can be continued.
12. Disconnect the wire from the fuel cut-off valve.
13. Turn out the valve from TNVD.
14. Remove the valve piston (see illustration).
15. Screw the valve body back into place to seal the system.
16. Start the engine. The start will be carried out as usual, however, the engine will need to be turned off with the gear engaged.
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