13 53 310 Removing and Installing/Replacing A Fuel Injector

13 53 310 - Removing and installing or replacing one fuel injector in fuel injection system (N14)





Special tools required:






Warning!
Disconnect battery negative terminal 61 20 900 Disconnecting and Connecting Battery Negative Lead (risk of fire due to short-circuiting on removal)

Carry out installation work on fuel system only with coolant temperature below 40 °C.





Important!
Wear full face guard and protective gloves.

Fuel can emerge spontaneously at high velocity when the high-pressure line is released!





Important!
Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.

Introduced contaminants can cause malfunctions in the system!

- Do not allow any dirt particles or foreign bodies to get into the system.
- Remove all traces of dirt before removing pipes or individual components.
- Use only fluff-free cloths.
- Seal all fuel system openings with protective caps or plugs.





Necessary preliminary tasks:
- Remove high-pressure rail Service and Repair





Recycling:
Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.





Removal:

Remove retainer (1) and discard.

Pull up fuel injector (2) to remove.





Procedure in event of stuck injectors:

Note:
The following procedure applies to all injectors.

For purposes of clarity, illustration shows and description refers to the removed engine.





Mount special tool 13 0 231 with lettering "Top" facing upwards.





Mount special tool 13 0 232.

To secure injector, turn nut (1) by hand until noticeable resistance is felt.





Turn nut on special tool 13 0 232 several turns until injector has been released from hole.

Remove special tool.

Remove injector.





The fuel injector installation procedure is described separately.





Installation:

Installation Note:
- Make sure guide pin (3) of fuel injector (2) is correctly positioned in designated hole (4) in cylinder head
- Replace seal (6) and support ring (5), making sure support ring (5) is seated correctly
- Replace retainer (1)
- Replace Teflon seal





Replacing Teflon sealing ring:

Before replacing Teflon sealing ring (1), make sure hands and work surface are clean and free of oil.

Avoid mechanical contact with injector tip (2).





Remove Teflon sealing ring (1) with special tool 13 0 191 from injector (2).

Use a fluff-free cloth only to remove combustion residues from cylindrical part of injector tip (do not use ultrasound or other tools/agents).

Do not clean injector tip (2).





Slide new Teflon seal (1) onto mounting taper 13 0 195.





Use fingers and mounting taper 13 0 195 to slide Teflon seal (1) on to fuel injector (2).

Note:
- Do not use fingernails to slide on Teflon seal.
- Do not use any lubricants.
- The seal is expanded when slid on.





To bring the expanded Teflon sealing ring to its installation dimension, slide three mounting sleeves with decreasing diameters onto the injector.

Slide mounting sleeve (1) with large opening first onto injector (2).

Do not use any lubricating agents.





First slide mounting sleeve 13 0 192 (large diameter) onto injector (1).

Then slide mounting sleeve 13 0 193 (medium diameter) onto injector (1).





Finally, press injector (1) into mounting sleeve 13 0 194 (small diameter).





Check fuel system for leaks. Pressure Line Leak Test

Assemble engine.

Check function of DME.