REPLACING ALL SPARK PLUGS (N42, N40, N46, N45, N52, N52K, N51)
Special tools required:
12 1 171
12 1 200.
Necessary preliminary tasks:
Switch off ignition
Remove ignition coils.
Unscrew spark plugs with special tool 12 1 171.
Installation:
Tighten down spark plugs with special tool 12 1 171a
Necessary preliminary tasks:
Remove mechanism for glass cover at front.
Overview of glass lid mechanism:
Fig. 1: Identifying Glass Lid Mechanism Components
Floating roofliner mechanism
Mechanism, front glass lid
Drive wedge
Drive plate
Mechanism, rear glass lid
Control carriage, rear gla