Contents: Removal ⤓ Installation ⤓
Defective injectors can cause severe engine detonation and, as a result, damage to the bearings. If such comments are present, leave the engine idling and loosen the union nuts of the injection pipeline one by one. If the detonation disappears when any union nut is loosened, this indicates the corresponding defective injector.
A defective injector can be identified by successively loosening the union nuts at high idle speed. If the number of revolutions does not change after loosening the union nut, this indicates that the corresponding injector is defective. The injector can be checked using a pressure gauge. (Workshop work; required injection pressure value: 120-130 bar). The first signs of injector malfunction are as follows:
- false ignitions
- detonation in one or more cylinders
- engine overheating
- engine power reduction
- excessively strong black exhaust
- increased fuel consumption.
Removal
Carefully clean the outside of the injection line and fuel return pipes with cold cleaner or diesel fuel.
Remove the injection pipeline as a set, to do this, loosen the union nuts on the pump and injectors with a wrench. At the same time, hold the underwater pipeline mount and the injector mount with a wrench.
Caution: Do not disturb the bend shape.
Caution: After unscrewing the underwater pipeline, plug the holes with suitable plugs to prevent dirt and foreign objects from getting inside.
Disconnect the fuel return hose.
Remove the fuel return pipe nuts.
Caution: When doing this, hold the Allen key on the tube, otherwise it may bend or break.
Remove the fuel return pipe.
Unscrew the injectors using an extended head and fold them in the same order as they were removed. If necessary, you can mark the injectors with adhesive tape to install them in their original places.
Cover the holes under the nozzles to prevent foreign objects from getting in.
Each hole has a holder seal and a nozzle seal. These must be replaced.
Attention: Never treat the nozzle and nozzle needle with wire, a file or sandpaper. Do not mix up the parts of different nozzles.
Installation
Clean the injector holes and insert 4 new holder seals and injector seals into them.
Install the injectors and tighten to 60 Nm.
Caution: Overtightening the holder may cause deformation of the injector and, thus, the injector needle to stick or cause other damage.
Install the fuel return pipes with 4 new gaskets and tighten the nuts to 40 Nm.
Note: When doing this, hold the Allen key of the corresponding tube with a wrench.
Install the injection pipeline and tighten the nuts to 35 Nm. Hold the pipeline holders or injector holders with a wrench.
Secure the pipeline bracket.
Slightly loosen the union nuts of the injection pipes on all injector holders.
Turn the engine with the starter until diesel fuel appears at the injection pipes. Tighten the injection pipes with the prescribed force. If necessary, remove air from the fuel system using a hand pump, see paragraph 32.1.
(The source of the article is available at MitsubishiMan.ru)