Spark Plug: Service and Repair

12 12 011 Replacing All Spark Plugs (N53, N54, N55, N63, S63)

Special tools required:







Necessary preliminary work:
- Switch off ignition.
- Remove ignition coils.







IMPORTANT:
Wear safety goggles.
Oil and dirt particles may get into your eyes.
Clean spark plug slot with compressed air.







Unscrew spark plugs with special tool 12 1 220 and an extension with min. 8� kink.







Installation note:
Attach new spark plug (1) 12 1 230to special tool.







Installation note:
Screw the spark plug hand-tight with special tool 12 1 230 into the cylinder head plug thread to the limit position.







Installation note:
Tighten the spark plugs with a torque wrench, special tool 12 1 220 and an extension with a minimum kink of 8°.
Observe tightening torque.
Tightening torque 12 12 2AZ.







Assemble engine.