11 34 560 Replacing all valve stem seals (N74)

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IMPORTANT: Risk of damage to sealing lip on valve stem seal.
Fit new valve stem seals only when all valves have been installed.

Necessary preliminary tasks:

Remove all VALVE SPRINGS .

Press special tool 11 6 370 onto the valve stem seal.

Withdraw valve stem seal by turning and simultaneously unscrewing special tool 11 6 370 .

Fig 1: Pressing Special Tool 11 6 370 Onto Valve Stem Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Lubricate valve stem with oil and insert valve.

Installation sleeve 11 1 380 is included in the delivery specification for the valve stem seals.

Fig 2: Identifying Valve Stem Seal And Special Tool 11 1 380

Courtesy of BMW OF NORTH AMERICA, INC.

Fit special tool 11 1 380 .

Coat new valve stem seal (1) with oil and install.

NOTE: For use on the N74 engine, the special tool 11 6 380 must be remachined according to the sketch with a 6.2 mm drill bit dia. to a depth of A = approx. 45 mm.

This modification has already been taken into account for reordering.

Fig 3: Identifying Special Tool 11 6 380 Modification Dimensions

Courtesy of BMW OF NORTH AMERICA, INC.

Manually press on valve stem seal as far as it will go with special tool 11 6 380 .

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

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.