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Home >> BMW >> 2013 >> 740Lxi >> Repair and Diagnosis >> External Pages >> Different car >> Section 432 (Fuel System - Repair) >> Injection Nozzle And Lines >> 13 53 310 Removing and installing/replacing an injector (N63) >> Replace Teflon ring

Replace Teflon ring

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

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

Avoid mechanical contact with injector tip (2).

Fig 1: Identifying Teflon Ring And Injector Tip
G04789982Courtesy of BMW OF NORTH AMERICA, INC.

Remove Teflon 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.

Fig 2: Removing Teflon Ring From Injector Using Special Tool (13 0 191)
G04789983Courtesy of BMW OF NORTH AMERICA, INC.

Push new Teflon ring (1) onto the installation cone 13 0 195 .

Fig 3: Identifying Teflon Ring Onto Installation Cone (13 0 195)
G04789984Courtesy of BMW OF NORTH AMERICA, INC.

Push Teflon ring (1) with fingers assisted by the installation cone 13 0 195 onto the injector (2).

NOTE:
  • Do not use fingernails to slide Teflon ring on.
  • Do not use any lubricating agents.
  • The sealing ring is expanded when slid on.
Fig 4: Pushing Teflon Ring Onto Injector Using Fingers And Installation Cone (13 0 195)
G04789985Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Do not use any lubricating agents.

Fig 5: Sliding Assembly Sleeve Onto Injector
G04789986Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 6: Sliding Slide Assembly 13 0 192 (Large Diameter) Onto Injector
G04789987Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation note: 

Install injector within 10 minutes or slide on protective cap (Fig. 13 14 05) Teflon ring swells up.

Fig 7: Identifying Injector Into Assembly Sleeve 13 0 194 (Small Diameter)
G04789988Courtesy of BMW OF NORTH AMERICA, INC.