Replacing Teflon Sealing Ring

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NOTE: Incorrect handling of injectors

Leaks in combustion chamber

→ Teflon sealing rings must always be replaced after removal and before refitting injectors.

→ Do not replace Teflon sealing rings until just before fitting the injector.

→ Install injector immediately after replacing the Teflon sealing ring.

Information

The pictures shown in this document may differ from the original .

Information

The tool numbers refer to the individual parts of the tools in the Repair Kit T10133 and the Supplement Set T10133/11-15 (unless indicated otherwise).

Installation Position Of Teflon Sealing Ring: -arrow-

Fig 1: Identifying Teflon Sealing Ring Installation Position

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Remove high-pressure fuel injector.
Clean fuel injector carefully using a plastic brush (or cloth) and acetone or solvent naphtha. Hold Teflon sealing ring gently using a pointed-nose pliers and carefully pull off Teflon sealing ring -1- . Do not scratch the valve body.

Fig 2: Removing Teflon Sealing Ring
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Also clean sealing ring groove in the sealing ring area. Remove any deposits (coking).
Fit new sealing ring -2- on mounting cone no. 5 -1- . Using assembly sleeve no. 6 -3- (knurling facing the sealing ring), push sealing ring gently as far as it will go onto mounting cone no. 5.

Fig 3: Identifying Teflon Sealing Ring On Mounting Cone
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Turn assembly sleeve no. 6 -3- around (knurled side now no longer facing sealing ring), and push sealing ring -2- onto the end of mounting cone no. 5 -1- .

Fig 4: Identifying Assembly Sleeve Turned Around
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Place mounting cone no. 5 with sealing ring onto the fuel injector from the front -1- . Push sealing ring further onto the fuel injector using assembly sleeve no. 6 -2- .

Fig 5: Fitting Teflon Sealing Ring
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

The Sealing Ring Is Not Yet Seated In Its Groove!
Remove assembly sleeve no. 6 and mounting cone no. 5. Push sealing ring into the ring groove using assembly sleeve no. 6. → Pushing Teflon sealing ring into ring groove
Calibration (Shaping) Of Teflon Sealing Ring:

Fig 6: Pushing Teflon Sealing Ring Into Ring Groove
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. 7.1. Press calibrating sleeve no. 8 -1- as far as it will go over the sealing ring. Leave calibrating sleeve no. 8 → Time: 1 Minute on the sealing ring. If calibrating sleeve no. 8 does not fit immediately because the Teflon sealing ring has expanded, use calibrating sleeve no. 7 in the same way as in the previous step.
  
  Fig 7: Calibrating Teflon Sealing Ring
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 7.2. Pull off calibrating sleeve no. 8 again.
  The Teflon Sealing Ring Now Has The Correct Installation Dimension .
The injector should now be installed immediately, as the Teflon sealing ring will soon start to swell (prevents leaks when installed). Otherwise leave calibrating sleeve no. 8 -1- on the Teflon sealing ring for longer or fit calibration cap (transport sleeve for new injectors) -2- .