Spark Plug: Service and Repair
Replacing Spark Plugs
Tools
Preliminary work
1. Switch off ignition and remove ignition key.
Removing design cover
Removing design cover of cylinder bank 1 - 4
1. Remove engine compartment cover on the right and rear. To do this, undo the four bayonet screws and the fastening screw on the washer-fluid reservoir.
2. Detach the torque support. To do this, unscrew the fastening screw on the torque support bracket and pull it out.
3. Detach the torque support from the body and swivel upwards.
4. Detach the secondary air pump from cylinder bank 1 -4. To do this, unscrew the three fastening screws, pull the pump out of the bracket and lay it aside.
NOTE: Place a cloth between design cover and support for secondary air pump to avoid scratching cover.
5. Unscrew the four fastening screws on the ignition coil cover (illustration shows side 5 - 8).
6. Remove design cover from cylinder bank 1 - 4. Lift the cover slightly with both hands on the edge pointing towards the intake system until it snaps out of the fastening points.
7. Lift the cover at the front edge and slide the ignition coil cover of the second cylinder out of the torque support bracket. Pull out cover to the front.
8. Remove torque arm bracket. To do so, undo the four fastening screws and set bracket aside.
Removing design cover of cylinder bank 5 - 8
NOTE: Place a cloth between secondary air pump and design cover to avoid scratching the cover.
1. Unscrew the four fastening screws on the ignition coil cover.
2. Remove design cover of cylinder bank 5 - 8. To do this, lift the cover slightly with both hands at the edge pointing towards the intake system until it is released from its holder.
3. Lift the front of the design cover and remove it.
Replacing spark plugs
1. Pull off lower hose from secondary air pump 5 - 8.
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.
3. Undo ignition coil. To do this, unscrew the fastening screw on the valve cover.
4. Pull out ignition coil and lay it aside.
5. Undo spark plugs using special tool spark plug wrench 3122 B.
ATTENTION:
Broken spark plug electrodes can damage the engine.
- Bits of electrodes can fall into the combustion chamber.
- Only check electrode gap of spark plugs, but do not bend them.
- Spark plugs with an incorrect electrode gap must be replaced.
6. Check electrode gap in V8 naturally aspirated engine. Control value: 1.6 mm
7. Check electrode gap in V8 turbo engine. Control value: 0.8 mm ±0.05 mm
NOTE:
- Use only spark plugs approved by Porsche AG.
- Check electrode gap before screwing in a new spark plug.
8. Tighten spark plugs using special tool spark plug wrench 3122 B. Tightening torque: 25 (19 ftlb.) Nm, Tightening torque: 30 (22 ftlb.) Nm
9. Reconnect the ignition coil. Tighten the fastening screws. Tightening torque: 10 (7.5 ftlb.) Nm
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.
Installing design cover
Installing design cover of cylinder bank 5 - 8
NOTE: Place a cloth between secondary air pump and design cover to avoid scratching the cover.
1. Slide the design cover under the secondary air pump as illustrated.
2. Then press in the two rubber mountings on the bracket. The rubber mounts must be felt to engage.
3. Tighten the four fastening screws on the ignition coils. Tightening torque: 3.5 ftlb.
Installing design cover of cylinder bank 1 - 4
NOTE: Place a cloth between secondary air pump bracket and design cover to avoid scratching the cover.
1. Install bracket for the torque support. The M8 x 45 Torx screws are tightened at the upper screw points. Tightening torque: 23 ftlb. At the lower screw-mounting points (centre of valve cover) the M6 x 40 are first tightened to Initial tightening: 3.5 ftlb. and then to Final tightening: 7.5 ftlb..
2. Slide the design cover of cylinder bank 1 - 4 under the secondary air pump bracket as shown in the illustration and then slide the cover of the second ignition coil through underneath the torque support bracket.
3. Press down the two rubber mounts on the bracket. The rubber mounts must be felt to engage.
4. Tighten the four fastening screws on the ignition coils (illustration shows side 5 - 8). Tightening torque: 3.5 ftlb.
5. Reinstall secondary air pump. Tighten the three fastening screws. Tightening torque: 7.5 ftlb.
6. Reinstall torque support. Install the fastening screw (M10 x 85) with a new lock nut on the bracket. Tightening torque: 44 ftlb.
7. Tighten torque support fastening screw on the body (M10 x 70). Tightening torque: 44 ftlb.
8. Install the engine compartment cover at the right and rear. To do this, tighten the four bayonet screws and the sheetmetal screw on the washer-fluid reservoir.