Valve Guide Seal: Service and Repair

11 34 560 Replacing all valve stem seals (N55)





Special tools required:
^ 11 1 480
^ 11 6 380





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 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.





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:
Graphic N42.





Assemble engine.