Replacing spark plugs

1. Pull off lower hose from secondary air pump 5 - 8.

Fig 1: Separating ignition coils from wire harness

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2. Separate the eight ignition coils from the wire harness. To do this, press on the button and, at the same time, pull off the plug.

Fig 2: Fastening screw on valve cover

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3. Undo ignition coil. To do this, unscrew the fastening screw on the valve cover.

Fig 3: Ignition coil

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4. Pull out ignition coil and lay it aside.

Fig 4: Loosening spark plugs using spark plug wrench

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5. Undo spark plugs using special tool spark plug wrench 3122 B

CAUTION: Broken spark plug electrodes can damage the engine!

→ Only check electrode gap of spark plugs, but do not bend them.

→ Spark plugs with an incorrect electrode gap must be replaced.

Fig 5: Electrode gap of spark plug in V8 naturally aspirated engine

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6. Check electrode gap in V8 naturally aspirated engine. → Control value: 1.6 mm

Fig 6: Electrode gap of spark plug in V8 turbo engine

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7. Check electrode gap in V8 turbo engine. → Control value: 0.8 mm +/-0.05 mm

Fig 7: Tightening spark plugs using spark plug wrench

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NOTE:

Tighten spark plugs using special tool spark plug wrench 3122 B . → Tightening torque: 25 (19 ftlb.) Nm , → Tightening torque: 30 (22 ftlb.) Nm

Fig 8: Fastening screw on valve cover

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9. Reconnect the ignition coil. Tighten the fastening screws. → Tightening torque: 10 (7.5 ftlb.) Nm

Fig 9: Connecting ignition coil

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10. Connect ignition coil. To do this, push on the connector until it locks with an audible click.

11. Push lower hose onto secondary air pump 5 - 8.