Valve Stem Seals, Cylinder Head Removed, Replacing

Valve Stem Seals, Cylinder Head Removed, Replacing

Special tools, testers and auxiliary items required

• Valve Seal Removal Tool (3364)

• Valve Stem Seal Driver (3365)

• Valve Cotter Disassembly and Assembly Device (VAS 5161)

• Engine And Transmission Holder (VAS 6095)

• Cylinder Head Tension Device (VAS 6419)

Procedure

- Remove camshafts. Refer to => [ Camshafts ] Service and Repair.

- Mark the allocation of the roller rocker lever and the hydraulic adjusting elements so they can be installed again.

- If necessary, remove the roller rocker levers with the hydraulic adjusting elements and place them on a clean surface.

- Mount the Cylinder Head Tensioning Device (VAS 6419) into the Engine and Transmission Holder (VAS 6095).





- Tension the cylinder head on the cylinder head tensioning device as illustrated.

- Connect the cylinder head tensioning device to the compressed air.

- Slide the air cushion with the lever - arrow - under the combustion chamber onto the valve stem seal that will be removed.

- Let enough compressed air flow into the air cushion until it contacts the valve plate.

- Place Drift (VAS 5161/3) on valve spring plate and loosen stuck valve keepers using a plastic hammer.





- Position Guide Plate (VAS 5161/19B) on cylinder head.





- Secure the guide plate with the Knurled Screws (VAS 5161/12).

- Screw Engaging Device (VAS 5161/6) with Installation Fork (VAS 5161/5) into guide plate.





- Push Installation Cartridge (VAS 5161/8) into guide plate.

- Hook in Pressure Fork (VAS 5161/2) at engaging device and press down installation cartridge.

- At the same time, turn knurled bolt of installation cartridge to the right, until the points engage in the valve keepers.

- Lightly move knurled bolt back and forth, this causes the valve keepers to be pressed apart and captured in the installation cartridge.

- Release pressure fork.

- Take out installation cartridge.

- Unfasten guide plate and turn it aside.

- Remove valve spring with valve spring plate.

- Pull off valve stem oil seals using Valve Seal Removal Tool (3364).





• A plastic sleeve - A - is supplied with the new valve shaft seals.





- Place plastic sleeve - A - on valve stem to prevent damage to new valve stem seals - B -.

- Lightly coat sealing lips of valve stem seal with oil.

- Push valve stem seal onto plastic sleeve.

- Carefully press valve stem oil seal onto valve guide using (3365).

- Remove plastic sleeve again.

If the valve keepers were removed from the installation cartridge, they must be inserted into Valve Insertion Device (VAS 5161/18) next.





• The large diameter of the valve keepers point upward.

- Install valve spring and valve spring plate.

• The tight spring coils - arrow - face toward cylinder head.





- Screw guide plate onto cylinder head again.

- Insert installation cartridge into guide plate.

- Press the pressure fork down and pull the knurled bolt upward while turning it left and right to insert the valve keepers.





- Release pressure fork with the knurled bolt still pulled.

- Repeat the procedure on each valve.

Assembling

Assembly is in reverse order of removal, note the following:

- Make sure all the roller rocker levers seat properly on the valve stem ends and are clipped onto the respective hydraulic adjusting elements.

- Install camshafts. Refer to => [ Camshafts ] Service and Repair.