Valve Guide Seal: Service and Repair

11 34 560 Replacing all valve stem seals (N74)

Special tools required:





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.





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.

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.





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





Assemble engine.