Valve Stem Seals, Removing And Installing, Cylinder Head Installed: Procedure

-- Remove all of the left and right camshafts, refer to REMOVING .

-- 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.

-- Remove spark plugs with Spark Plug Removal Tool 3122B.

-- Move piston for that cylinder to "bottom dead center position".

-- Position the Punch VAS 5161/3A on the valve spring plate and loosen the stuck valve retainers with a plastic mallet.

-- Place Valve Cotter Tool Kit - Guide Plate VAS 5161/19C from Valve Cotter Tool Kit VAS 5161 on the cylinder head.

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

-- Install the Valve Cotter Tool Kit - Adapter T40012 with sealing ring in the spark plug thread and tighten by hand.

-- Connect the adapter to the compressed air using a commercially available intermediate piece and give steady pressure.

• Minimum pressure: 6 bar

-- Install the Retainer VAS 5161/6 with the Guide Forks M6/M8 with Threaded Studs VAS 5161/5 in the guide plate.

-- Push the assembly cartridge VAS 5161/8A into guide plate.

-- Engage the pressure fork VAS 5161/2 at the engaging device and press the installation cartridge downward.

-- At the same time, rotate the cartridge knurled screw right until points engage in valve retainers.

-- Move the knurled wheel left and right slightly. This presses the valve retainers apart and captures them in the cartridge.

-- Release the pressure fork.

-- Remove the cartridge.

-- Unfasten guide plate and turn it aside.

• Pressurized air hose remains connected.

-- Remove the valve spring and the valve spring plate.

-- Remove the valve stem seal with the Puller - Valve Seal 3364.

If the Puller - Valve Seal 3364 cannot be used on some valve stem seals due to restricted clearance, proceed as follows.

-- Drive out the roll pin -arrow- on the puller with a drift and remove the impact puller attachment.

-- Position the lower part of the puller - valve seal 3364 on the valve stem seal.

-- Secure the puller with a drift or cotter pin drive -1- as shown.

-- Position the valve lever on the puller and remove the valve stem seal -arrow-.

-- Lightly oil the valve stem seal.

-- Slide the valve stem seal onto the plastic sleeve.

-- Carefully press the valve stem seal onto the valve guide with the Seal Installer - Valve Stem 3365.

-- Remove the plastic sleeve again.

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

• The large diameter of the valve retainers point upward.

-- Press the cartridge from above onto the insertion device and capture keepers.

-- Insert the valve spring and the valve spring plate, for allocation refer to Figure.

-- Attach the Valve Cotter Tool Kit - Guide Plate 19C VAS 5161/19C onto the cylinder head again.

-- Insert installation cartridge in guide plate.

-- Press the pressure fork down and pull the knurled screw up while turn left and right. This inserts the valve retainers.

-- Release the pressure fork with the knurled screw still raised.

-- Repeat the procedure on each valve.