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)

• Tensioning element (VAS 6419)

Procedure

- Remove camshafts. Refer to => [ Camshafts ] Camshafts.

- Insert tensioning element (VAS 6419) in the engine and transmission holder (VAS 6095).





- Tension cylinder head on tensioning element ( VAS 6419) as shown in the illustration.

- Connect tensioning element (VAS 6419) to compressed air.

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

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

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





- Place guide plate (VAS 5161/19 A) from valve cotter disassembly and assembly device (VAS 5161) on cylinder head.





- Secure guide plate with knurled screws (VAS 5161/12 ).

- Install 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, causing valve keepers to be pressed apart and be 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 Valve Stem Seal Driver (3365).

- Remove plastic sleeve again.

If valve keys were removed from the installation cartridge, they must be inserted into insertion device (VAS 5161/18) next.





• The large diameter of the valve keepers point upward.

- Press installation cartridge from above onto valve keeper inserting tool and capture keepers.

- Install valve spring and valve spring plate.





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

- Install guide plate onto cylinder head again.





- Insert installation cartridge into guide plate.

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

- Release pressure fork with knurled bolt still pulled.

- Repeat procedure on each valve.

Assembling

Assembly is in reverse order of removal, noting 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 ] Camshafts.