Renewing O-rings for unit injector: Audi A3 (AVB, AVF, AWX, BKC, …)

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

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• Important: Ensure that no burrs are formed at the O-ring seats.

🔧 Engine codes this applies to

📋 Procedure

1. Remove unit injector .
2. Lever old O-rings very carefully off unit injector.
3. Important: Ensure that no burrs are formed at the O-ring seats.
4. Remove the insulating seal together with the retaining ring. [Note: Always use the assembly sleeves to fit the O-rings. There is a danger of damaging the O-rings if the sleeves are not used.O-rings with no colour identification were phased in gradually. Make sure the correct O-rings are fitted in the different grooves: The thinner O-rings are fitted in the grooves closer to the injector nozzle.Prevent the O-rings from rolling when sliding them on. The O-rings must not be twisted when seated on the unit injector.]
5. Clean seating surfaces for O-rings on unit injector very carefully.

6. Fit assembly sleeve T10056/1 onto unit injector, pushing it to the limit stop.
7. Push the upper, thicker O-ring carefully onto the assembly sleeve and into the seat on the unit injector.
8. Remove assembly sleeve T10056/1.
9. Fit assembly sleeve T10056/2 onto unit injector, pushing it to the limit stop.
10. Push the middle, thinner O-ring carefully onto the assembly sleeve and into the seat on the unit injector.
11. Remove assembly sleeve T10056/2.
12. Fit assembly sleeve T10056/3 onto unit injector, pushing it to the limit stop.
13. Push lower O-ring carefully onto assembly sleeve T10056/3 and into groove on unit injector.
14. Remove assembly sleeve T10056/3.
15. Push on a new insulating seal together with the retaining ring.
16. Install unit injector .

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