Injectors — removal and installation (Mitsubishi Colt 4)

Removal

Remove the ground cable from the battery.

Remove the engine cover.

Relieve the fuel pressure.

Disconnect the fuel pressure sensor connector.

When reusing the fuel pressure sensor, make alignment marks on the flange and on the sensor (arrow).



If a new fuel pressure sensor is installed, it must be replaced together with the flange - as a set.

Remove the fuel pressure sensor and gasket and ring.

Remove the air filter, throttle body and intake manifold.



Remove the bolts, disconnect the connectors and remove the injector wiring harness.

Remove the injector wiring harness support bracket.

Remove the fuel pipe.

Remove the lower ring, O-ring and upper ring.

After unscrewing the bolt, remove the washer and the nozzle holder.

After unscrewing the bolts, remove the fuel manifold with the injectors as an assembly without separating them.

After unscrewing the bolt, remove the insulator

Remove the injector nozzle gaskets, profile washers, lower O-ring and upper O-ring.

Installation

Installation is carried out in reverse order, taking into account the following.

Install the rings and O-ring.

Make sure the lower ring is installed correctly (the outer diameter of this ring is 14.8 mm). Do not confuse it with the support ring of the fuel pressure sensor.



Apply grease to the surface of the profile washer (1) to prevent it from falling during installation of the injector, install it on the injector.

The profile washer does not allow its reuse. Carefully, being careful not to damage the seal, and turning the injector left and right, connect it to the fuel manifold.



If the nozzle rotates in its seat with "sticking", then it is possible that the ring seal is "bitten".

Remove the injector, check the condition of the O-ring, reconnect the injector to the fuel rail and recheck the quality of the assembly.

Align the alignment marks (1) of the injector and fuel manifold.



Install the injector gasket and insulator into the cylinder head.

Install the injector and fuel rail assembly into the cylinder head and secure it by hand.

Install the injector holder and washer and tighten to the specified torque.

Tighten the fuel rail and injector assembly mounting bolts.



Install the rings and O-ring.

Make sure the top ring is installed correctly: (outer diameter is 14.8 mm). Do not confuse it with the fuel pressure sensor support ring.



Coat the O-ring with clean engine oil.

Install the fuel pipes into the high pressure fuel pump channels at right angles.

(The article was taken from the website: MitsubishiMan)

Install the ring (2) and the O-ring (3) onto the fuel pressure sensor (1). The outer diameter of this O-ring is 15.1 mm.



Coat the fuel pressure sensor gasket with engine oil. Install the fuel pressure sensor (1) so that its number plate (2) is positioned as shown in the figure on the right.

If the fuel pressure sensor is reused, then before removing it, it is necessary to mark the relative position of its body and flange.



Check the fuel system for leaks, remove air from the high-pressure fuel line.