Valve Stem Seals, Cylinder Head Installed: Procedure

-- Remove the camshafts. Refer to CAMSHAFTS .

-- 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 3122 B.

-- Move piston for respective cylinder to "Bottom Dead Center (DC) position".

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

Fig 1: Placing Drift VAS 5161/3 On Valve Spring Plate And Loosening Stuck Valve Keepers Using Plastic Hammer

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-- Mount the VAS 5161/19B on the cylinder head.

Fig 2: Identifying VAS 5161/19B

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-- Secure the guide plate with the VAS 5161/12.

-- Install T40012 with sealing ring in respective spark plug thread and hand tighten.

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

• Minimum pressure: 6 bar positive pressure.

-- Install VAS 5161/6 with VAS 5161/5 in guide plate.

Fig 3: Identifying Engaging Device VAS 5161/6 With Installation Fork VAS 5161/5 Installed Into Guide Plate

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-- Slide VAS 5161/8 in guide plate.

-- Engage VAS 5161/2 on engaging device and press installation cartridge down.

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

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

-- Release the pressure fork.

-- Remove installation 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.

Fig 4: Identifying 3364

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

Fig 5: Driving Out Roll Pin -Arrow-

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-- Remove 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.

Fig 6: Positioning Lower Part Of 3364 Valve Stem Removal Tool At Valve Stem Oil 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-.

Fig 7: Identifying Plastic Sleeve, New Valve Stem Oil Seals & Valve Stem Seal Driver 3365

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-- Lightly oil valve stem seal.

-- Slide valve shaft seal onto plastic sleeve.

-- Carefully press valve stem seal onto valve guide with 3365.

-- Remove plastic sleeve.

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

Fig 8: Identifying Installation Cartridge VAS 5161/8

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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.

• Installed position, valve spring. Refer to Figure.

-- Mount the VAS 5161/19B on the cylinder head.

Fig 9: Identifying Engaging Device VAS 5161/6 With Installation Fork VAS 5161/5 Installed Into Guide Plate

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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.