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6.2.7. Check and adjustment of the moments of injection (TNVD Lucas)

Some of traffic jams of access and the TNVD installations can be sealed up at manufacturer. It is not necessary to break sealing on the new, protected by guarantee certificates car. Do not make attempts of performance of settings in the absence of suitable tools. Try not to allow hits in TNVD or tubes of nozzles of dirt at all. Also attentively study the preventions provided in the section Power supply system - diesel models.


Performance of the forthcoming checks will require the special probe and the dial measuring instrument with an assembly arm (Citroyon No. 4093-TJ). In the absence of near at hand this adaptation work should be charged to specialists of car repair shop.


 PERFORMANCE ORDER

1. If check is made at established on the TNVD engine, but not in the course of installation of the last, disconnect a negative wire from the battery and cover with polyethylene the generator. Remove forsunochny tubes (see Removal and the TNVD installation, the subsection "Removal", item 12).
2. Achieve combination of adjusting drillings of blocking of a bent shaft (see Fixing cranked/distributive shaft and TNVD for the purpose of prevention of casual hit of valves in contact with pistons in the course of performing procedures of service of the car). Remove the blocking tool and turn a shaft back (counterclockwise) approximately on a quarter of a turn.

3. Turn out an access stopper from a guide from above on a pump housing, remove a sealing washer. Enter the special probe into a guide, having tracked correctness of landing it on a sealing surface.

For obtaining reliable results of measurement the probe has to nestle on a sealing surface of a guide, but not on its top sponges.

4. Fix an assembly arm of the special measuring instrument (Citroyon No. 4093-TJ) on a pump guide, install on an arm the dial measuring instrument so that it the end adjoined to draft of an arm. Adjust position of the measuring instrument so that its plunger appeared in a middle part of the course and nullify the device.

The measuring instrument of the static moment of injection of fuel (1) with the assembly arm (2) and an adjusting rod (3), the correct image established on TNVD

5. Slowly turn a bent shaft in the direction of normal rotation (clockwise) until again the possibility of introduction of the blocking tool does not appear.

6. Having blocked a bent shaft, consider the indication of the measuring instrument: it has to correspond to the value specified in marking of the pump (with a tolerance ± 0.04 mm). Marking is put on the plastic disk fixed in a forward part of TNVD, or on Schild, put on the operating lever.

7. Additional marking is put on pasted on the surface of the TNVD case a label (1) and to Schild (2) fixed on the operating lever (the gas lever) (the Lucas system pump).

8. On each of rotors of the pump there is a rounded pin (c) which situation is accurately exposed at manufacturer. The moment of the beginning of injection is defined by the X size at the piston of the fourth cylinder which is in the provision of VMT. This size is also engraved on the labels and shilda mentioned above.
and — the Adjusting probe
b — the Directing plug
with — the Pin defining installation of the moment of the beginning of injection

9. If the result of measurement testifies to need of carrying out adjustment, weaken forward nuts and a back bolt of fastening of the pump and begin to turn slowly the TNVD case until the measuring instrument does not record the required value. Having achieved satisfactory result, tighten fixture the pump with the required effort. For the purpose of ensuring access to nuts of fastening of the pump it is necessary to turn out two screws and to remove a panel cover from a radiator wall.
10. Slowly raise the measuring probe so that it left gearing with the directing pump rotor plug, then take the core blocking a bent shaft. Turn a bent shaft one with three quarters a turn in the direction of normal rotation.
11. Again lower against the stop the measuring probe, having tracked correctness of landing it on a pump guide (see item 3). Nullify the measuring instrument.
12. Slowly turn a shaft in the normal direction until the possibility of introduction of the blocking tool appears. Check correctness of adjustment of TNVD.
13. If need for adjustment still takes place, repeat the procedures described in subitem 9 — 12.
14. Having achieved satisfactory result, remove the measuring instrument with an arm and take the probe.
15. Screw in directing the screw with a sealing washer and strongly tighten it.
16. If check was made during installation of the pump, act as it is described in the section Removal and the TNVD installation.
17. If the pump is installed on the engine, return to the place of a tube of nozzles and tighten cap nuts of their nipple connections with the required effort. Connect a negative wire to the battery and remove air from a power supply system (see Filling of a power supply system with fuel and removal from it air traffic jams). Start the engine and make adjustment of turns of idling and turns of prevention of a spontaneous stop (address the Head Routine maintenance).