11 34 560 Replacing all valve stem seals (N55)

Special tools required:

Necessary preliminary work:

Firmly press special tool 11 1 480 onto old valve stem seals.

Detach valve stem seal from valve stem by turning and simultaneously pulling special tool 11 1 480 .

Installation:

Insert all VALVES .

Fig 1: Pressing Special Tool 11 1 480 Onto Valve Stem Seals

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NOTE: For use on the N55 engine, special tool 11 6 380 must be remachined according to the picture with a 10 mm dia. drill bit to a depth of B = approx. 23 mm.
This modification has already been taken into account for reordering.

Fig 2: Identifying Special Tool 11 6 380 Dimensions

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IMPORTANT: Different diameters at valve stem.
All valve stem seals are color-coded.

For 5 mm dia. valves, the valve stem seal is marked red or brown.

For 6 mm dia. valves, the valve stem seal is marked green.

Fig 3: Identifying Valve Stem

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Installation:

Fit the assembly sleeves (plastic sleeves) contained in the delivery specification on the valve stem end.

Lubricate assembly sleeve.

Press on valve stem seal by hand with special tool 11 6 380 as far as it will go.

NOTE: Illustrations shows N42 engine.

Fig 4: Pressing Valve Stem Seal Using Special Tool 11 6 380

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Assemble engine.