11 34 560 Replacing all valve stem seals (N52K)

Special tools required:

11 1 480
11 6 380

Necessary preliminary tasks:

Remove Cylinder Head .
Remove Intermediate Lever
Remove Eccentric Shaft
Remove intake camshaft
Remove 11 31 028 Removing and installing/replacing exhaust camshaft (N52K) .
Remove Cam Followers

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: Special Tool (11 1 480)

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: For use on the N52K engine, special tool 11 6 380 must be re-machined 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: Special Tool (11 6 380)

Courtesy of BMW OF NORTH AMERICA, INC.

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 or light green.

Fig 3: Valve Stem Seal Mark

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Lubricate mounting sleeve.

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

Fig 4: Special Tool (11 6 380) And Installation Direction

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.