Audi Workshop Service and Repair Manuals

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 (these can be identified from octagonal fitting at end of injector body): Special tools and workshop equipment required

t  Assembly sleeves -T10308- Removing –  Remove unit injector → Chapter. –  Lever old O-rings very carefully off unit injector. –  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. t  Take care to ensure correct allocation of O-rings to grooves. The procedure is the same for both types of assembly sleeve. –  Clean seating grooves for O-rings on unit injector very carefully.

–  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.

–  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.

Position of O-rings -arrows- for unit injectors with solenoid valve

Position of O-rings -arrows- for piezo-type unit injectors (these can be identified from octagonal fitting -A- at end of injector body) –  Remove assembly sleeve. –  Install unit injector → Chapter.