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Removing and installing unit injector > < Assembly overview - unit injector

Golf Mk4

Removing and installing O-rings for unit injector
   
Removing and installing 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.
–  Pay particular attention to ensure that no burrs are created on seat of O-rings.
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.
t  Gradual introduction of O-rings with no coloured markings. Note the correct allocation of O-rings to grooves: the thickness of the rings reduces towards injector nozzle.
t  Prevent O-rings from rolling when sliding them on. The O-rings must not be twisted in their seats in unit injector.
–  Pull heat shield seat off together with securing clip.
–  Clean O-ring seating surfaces on unit injector very carefully.
  W00-0989
–  Fit assembly sleeve -T10056/1- onto stop on unit injector.
–  Slide upper, thicker O-ring carefully onto assembly sleeve and into seat on unit injector.
–  Remove assembly sleeve.
  N23-0313
–  Fit assembly sleeves -T10056- onto stop on unit injector.
–  Slide the middle, thinner O-ring carefully onto assembly sleeve and into seat on unit injector.
–  Remove assembly sleeve.
  N23-0314
–  Slide assembly sleeve -T10056/3- onto limit stop on unit injector.
–  Slide lower O-ring carefully on to assembly sleeve and into seat on unit injector.
–  Remove assembly sleeve.
–  Fit new heat shield seal together with securing clip.
–  Install unit injector → Chapter.
  N23-0315

Removing and installing unit injector > < Assembly overview - unit injector