- interruptions in the ignition of the fuel mixture;
- knocking in one or more cylinders;
- engine overheating;
- power loss;
- black exhaust smoke;
- high fuel consumption;
- blue exhaust smoke when starting a cold engine.
A bad injector can be identified by disconnecting the high pressure fuel lines from the injectors one by one while the engine is running at high idle. When removing the injector, proceed as follows:
- disconnect wires from AB;
- unscrew the bolt of the engine cover, disconnect the hose from it and remove the cover;
Pic. 478. Removal of fuel lines. The arrows show the fuel line connections
- loosen and unscrew the union nuts of the high pressure fuel lines (pic. 478). Remove all fuel lines as a set. Do not bend fuel lines;
- disconnect the fuel lines from the injection pump;
- remove the spring clip from the oil drain hose and remove the pipe kit;
Pic. 479. Oil leakage hoses are put on small fittings of nozzles
- disconnect the oil return hoses from the injectors (pic. 479);
- remove the needle lift sensor plug from the holder, and then disconnect the plug. Do not pull on the cable;
- release the cable of the needle lift sensor from the clamps that secure the fastening of the wiring harness of the glow plugs;
- disconnect the glow plug wiring harness;
Pic. 480. Removing pressure plates injectors
- unscrew the bolts of the clamping rails of the injectors (pic. 480) and remove the slats;
- remove the injectors. Using a screwdriver, remove the washers located under the nozzles. On nozzle No. 3, there is a connection point for the oil outlet pipeline. Loosen the hollow bolt. If necessary, the connection point for the oil return line can be removed.
The injectors are installed in the reverse order of the removal process. At the same time, always change to new washers located under the nozzles.
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