Replacing TEFLON Sealing Ring

NOTIFICATION 

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 > T10133C - Tool set  and the > T10133/11-15 - supplement set  (unless indicated otherwise).

Installation position of Teflon sealing ring: -arrow- 

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Teflon sealing ring

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

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   Removing Teflon sealing ring

3. Also clean sealing ring groove in the sealing ring area. Remove any deposits (coking).
4. 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.

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   Teflon sealing ring on mounting cone

5. Turn assembly sleeve no. 6 -3-  around (knurled side now no longer facing staling ring), and push sealing ring -2-  onto the end of mounting cone no. 5 -1- 

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   Assembly sleeve turned around

6. 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-  .

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   Fitting Teflon sealing ring

   The sealing ring is not yet seated in its groove! 

7. 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 

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   Pushing Teflon sealing ring into ring groove

   Calibration (shaping) of Teflon sealing ring: 

   Press calibrating sleeve no. 8 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 as described in the previous step.

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   Calibrating Teflon sealing ring

   Pull off calibrating sleeve no. 8 again.

   The Teflon sealing ring now has the correct installation dimension. 

8. 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-  .