SEAT Workshop Service and Repair Manuals

Removing and installing valve stem seals when cylinder head is removed

Special tools and workshop equipment required

t	Extractor -3364-, see equivalent → Anchor

t	Pressure tool -3365-, see equivalent → Anchor

t	Valve installation kit -VAS 5161- with guide plate -VAS 5161/23- and knurled spacer ring -VAS 5161/23-1-, see equivalent → Anchor

t	Engine / gearbox support -VAS 6095-

t	Cylinder head clamping device -VAS 6419-

t	Bolt M6x30 (2x)

Operation process –  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-. –  Tension cylinder head on cylinder head tensioning device as shown in illustration. –  Connect cylinder head clamping device to compressed air. –  Using lever -arrow-, slide air pad under combustion chamber where valve stem oil seal is to be removed. –  Allow compressed air to flow into air cushion until it lies against valve disc.

–  Place guide plate -VAS 5161/23- onto cylinder head. –  Secure guide plate by hand on intake manifold side using knurled screw-VAS 5161/12- and screw tight with two nuts M6x30 -Pos. 1-.

–  Insert drift -VAS 5161/3- into guide plate and use a plastic hammer to knock loose the firmly seated valve cotters.

–  Screw toothed piece -VAS 5161/6- with hooking 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 to press apart valve cotters and capture them in assembly cartridge. –  Release pressure fork. –  Remove assembly cartridge with knurled spacer ring. –  Remove valve spring and valve spring plate.

–  Extract the valve stem seals with the extractor -3364- .

Caution Risk of damage when installing valve stem seals. New valve stem oil seals -B- are supplied with plastic sleeve; fit plastic sleeve -A- onto valve stem. –  Lightly lubricate sealing lip of valve stem oil seal. –  Slip valve stem oil seal over plastic sleeve. –  Carefully fit the valve stem seal on the valve guide with the valve stem seal fitting tool -3365-. –  If necessary, use a plastic head hammer and tap lightly on fitting tool until valve stem oil seal is fitted to stop. –  Remove plastic sleeve. –  Insert valve spring and valve spring plate into cylinder head.

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

–  Insert the assembly cartridge back into the guide plate -VAS 5161/23-. –  Press pressure fork downwards and pull knurled screw upwards, turning it clockwise and anticlockwise. This inserts the valve cotters. –  Release pressure fork with knurled screw still in pulled position. –  Repeat procedure on each valve. Assembling Reassembly is carried out in the reverse order; note the following: –  Ensure that all roller rocker fingers contact valve stem ends correctly and are clipped into relevant hydraulic compensation elements. –  Install camshafts → Chapter.