Audi Workshop Service and Repair Manuals

Renewing valve stem oil seals with cylinder head removed Special tools and workshop equipment required

t  Valve stem seal puller -3364-

t  Valve stem seal fitting tool -3365-

t  Removal and installation device for valve cotters -VAS 5161- with knurled spacer ring -VAS 5161/23-1- and guide plate -VAS 5161/23-

t  Engine and gearbox support -VAS 6095- t  Cylinder head tensioning device -VAS 6419- Procedure Proceed as follows: –  Remove camshafts → Chapter. –  Mark original positions of roller rocker fingers and hydraulic compensation elements for reinstallation. –  Remove roller rocker fingers together with hydraulic compensation elements and put down on a clean surface. –  Insert cylinder head tensioning device -VAS 6419- into engine and gearbox support -VAS 6095-. –  Secure cylinder head in cylinder head tensioning device, as shown in illustration. –  Connect cylinder head tensioning device to compressed air.

–  Using lever -arrow-, slide air pad under combustion chamber where valve stem oil seal is to be removed. –  Apply just enough compressed air to bring air pad into contact with valve heads.

–  Fit guide plate -VAS 5161/23- onto cylinder head. –  Secure guide plate on intake manifold side with knurled screw -VAS 5161/12- and at studs by screwing on 2 nuts M6 without shoulder by hand until they make contact.

–  Apply drift -VAS 5161/3- to guide plate and use plastic-headed hammer to release sticking valve cotters.

–  Screw snap-in device -VAS 5161/6- with engaging fork -VAS 5161/5- into guide plate. –  Slide knurled spacer ring -VAS 5161/23-1- onto assembly cartridge -VAS 5161/8-. –  Attach pressure fork -VAS 5161/2- to snap-in device and push assembly cartridge down. –  At the same time, turn knurled screw of assembly cartridge clockwise until tips engage in valve cotters. –  Move knurled screw back and forth slightly; the valve cotters are thus forced apart and taken up by the assembly cartridge. –  Release pressure fork. –  Take off assembly cartridge with knurled spacer ring. –  Detach valve spring with valve spring plate.

–  Pull off valve stem oil seal with valve stem seal puller -3364-.

Caution Make sure valve stem oil seals are not damaged when installing. New valve stem oil seals -B- are supplied with plastic sleeve; fit plastic sleeve -A- onto valve stem. –  Lightly oil sealing lip of valve stem oil seal. –  Slide valve stem oil seal onto plastic sleeve. –  Carefully press valve stem oil seal onto valve guide using valve stem seal fitting tool -3365-. –  Take off plastic sleeve.

If valve cotters have been removed from assembly cartridge, they must first be inserted in insertion device -VAS 5161/18-. l  Larger diameter of valve cotters faces upwards. –  Insert valve spring and valve spring plate. –  Press assembly cartridge onto insertion device from above and take up valve cotters.

–  Insert assembly cartridge in guide plate -VAS 5161/23- again. –  Press down pressure fork and pull knurled screw upwards while turning screw in both directions - this will insert the valve cotters. –  Release pressure fork with knurled screw still in pulled position. –  Repeat procedure for each valve. Assembling Installation is carried out in the reverse order; note the following: –  Ensure that all roller rocker fingers make contact with the ends of the valve stems correctly and are clipped onto their respective hydraulic compensation elements. –  Install camshafts → Chapter.