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Removing and installing electrical wiring harness for unit injectors > < Removing and installing unit injector

A3 Mk2

Renewing O-rings for unit injector
Renewing O-rings for unit injector
Special tools and workshop equipment required
   
t  Assembly sleeves -T10056-
Removing
–  Remove unit injector → Chapter.
–  Lever old O-rings very carefully off unit injector.
–  Above all, ensure that no burrs are formed at the O-ring seats.
–  Remove the insulating seal together with the retaining ring.
Installing
  Note
t  Always use the assembly sleeves to fit the O-rings. Otherwise, the O-rings could get damaged.
t  Take care to ensure correct allocation of O-rings to grooves.
–  Clean seating surfaces for O-rings on unit injector very carefully.
  W00-0989
–  Fit assembly sleeve -T10056/1- onto unit injector, pushing it to the limit stop.
  Note
Push the O-rings into position when assembling: do not roll them on. They must not be twisted when seated on unit injector.
–  Push the upper O-ring carefully onto the assembly sleeve and into the seat of the unit injector.
–  Remove assembly sleeve.
  N23-0313
–  Fit assembly sleeve -T10056/2- onto unit injector, pushing it to the limit stop.
–  Push the centre O-ring carefully onto the assembly sleeve and into the seat of the unit injector.
–  Remove assembly sleeve.
  N23-0314
–  Fit assembly sleeve -T10056/3- onto unit injector, pushing it to the limit stop.
–  Push the lower O-ring carefully onto the assembly sleeve and into the seat on the unit injector.
–  Remove assembly sleeve.
–  Push on a new insulating seal together with the retaining ring.
–  Install unit injector → Chapter.
  N23-0315

Removing and installing electrical wiring harness for unit injectors > < Removing and installing unit injector