11 34 560 Replacing all valve stem seals (N55)
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Special tools required:
Necessary preliminary work:
- Remove CYLINDER HEAD .
- Remove INTERMEDIATE LEVER
- Remove ECCENTRIC SHAFT
- Remove INTAKE CAMSHAFT
- Remove EXHAUST CAMSHAFT .
- Remove ROCKER ARMS
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 .
NOTE:
For use on the N55 engine, special tool 11 6 380
must be remachined according to the illustration 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.
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.
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:
Illustration shows N42.
Assemble engine.