Spark Plug: Service and Repair

- Switch off ignition.

Cylinder Bank 1-6:



- Press interlock (2) and remove connector (1).




- Open clips (1).
- Unfasten hose clip (2) from auxiliary hose for air pump.
- Disconnect plug-in connection (3).
- Unfasten hose clip (4).
- Remove upper section of suction filter housing with mass air flow sensor.

Cylinder Bank 7-12:



- Open clips (1).
- Unfasten hose clip (2).
- Disconnect plug-in connection (3).
- Remove upper section of suction filter housing with mass air flow sensor.




- Disconnect plug connections (1 and 2) from heating valve.




- Unfasten cable connector (1) on heating hoses.




- Unfasten hose clip and remove vacuum hose.




- Remove heating valves from bracket and place on manifold.




- Place heating valve on manifold.
- Remove spark-plug connectors.

Cylinder 1-8:



- Use special tool 12 7 131 (extension) and special tool 12 1 171.

Installation Note: Tighten down spark plug with special tool 12 1 171 and special tool 12 7 131 (extension), special tool 12 1 200 (torque limiter). Without special tool 12 1 200, note tightening torque.

Cylinder 9-12:



- Use special tool 12 7 132 (extension) and special tool 12 1 171.

Installation Note: Tighten down spark plug with special tool 12 1 171 and special tool 12 7 132 (extension), special tool 12 1 200 (torque limiter). Without special tool 12 1 200, note tightening torque.

Tightening Torque: 30 ±3 Nm.