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Electrical wiring harness for unit injectors and glow plugs - exploded view > < Removing and installing unit injectors

A3 Mk2

Renewing O-rings for unit injectors
Renewing O-rings for unit injectors
Special tools for unit injectors with solenoid valve:
Special tools and workshop equipment required
   
t  Assembly sleeves -T10164-
Special tools for piezo-type unit injectors:
Special tools and workshop equipment required
  W00-10021
t  Assembly sleeves -T10308-
Removing
–  Remove unit injector → Chapter.
–  Pry old O-rings very carefully off unit injector using a suitable tool of soft material.
–  Important: Ensure that no burrs are formed at the O-ring seats.
Installing
  Note
t  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. The procedure is the same for both types of assembly sleeve.
t  Take care to ensure correct allocation of O-rings to grooves.
t  Prevent the O-rings from rolling when sliding them on. The O-rings must not be twisted when seated on the unit injector.
–  Clean seating grooves for O-rings on unit injector very carefully.
  W00-10322
–  Fit assembly sleeve -T10164/1- or assembly sleeve -T10308/1- onto unit injector, pushing it on as far as the stop.
  Note
Push the O-rings into position when assembling: do not roll them on. They must not be twisted when seated in the groove on the unit injector.
–  Push upper (thicker) O-ring carefully onto assembly sleeve and into groove on unit injector.
–  Remove assembly sleeve.
  N23-10021
–  Fit assembly sleeve -T10164/2- or assembly sleeve -T10308/2- onto unit injector, pushing it on as far as the stop.
–  Carefully push lower O-ring (marked white) onto assembly sleeve and into groove on unit injector.
–  Remove assembly sleeve.
–  Install unit injector → Chapter.
  N23-10022

Electrical wiring harness for unit injectors and glow plugs - exploded view > < Removing and installing unit injectors