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

Special tools and workshop equipment required 

• Spark Plug Removal Tool :3122B 
• Puller - Valve Seal :3364 
• Seal Installer - Valve Stem :3365 
• Valve Cotter Tool Kit :VAS5161A  with Valve Cotter Tool Kit - Guide Plate 19c :VAS5161/19C  or as an alternative Valve Cotter Tool Kit - Guide Plate 19B :VAS5161/19B 
• Valve Cotter Tool Kit - Adapter :T40012 

-- Remove the camshafts. Refer to CAMSHAFT, REMOVING AND INSTALLING .

-- 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 the spark plugs with :3122B  .

-- Set the piston for the respective cylinder to the "Bottom Dead Center (BDC) position".

-- Position the :VAS5161/3A  on the valve spring plate and loosen the stuck valve retainers with a plastic mallet.

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-- Place :VAS5161/19C  from :VAS5161A  on the cylinder head.

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-- Secure the guide plate with the :VAS5161/12  .

-- Install the :T40012/1  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 (87 psi).

-- Install the :VAS5161/6  with the :VAS5161/5  in the guide plate.

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-- Push the :VAS5161/8A  into guide plate.

-- Engage the :VAS5161/2  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 :3364  .

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

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

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

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

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

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-- 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 :3365  .

-- Remove the plastic sleeve again.

If the valve retainers were removed from the installation cartridge, they must be inserted into the :VAS5161/18  first.

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• The large diameter of the valve retainers point upward.

-- Press installation cartridge from above onto valve retainer inserting tool and capture retainers.

-- Insert valve spring and valve spring plate.

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

-- Attach the :VAS5161/19C  onto the cylinder head again.

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-- Insert installation cartridge in guide plate.

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

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

-- Repeat the procedure on each valve.