Spark Plug: Service and Repair

WM 287020 Removing and installing spark plugs on DFI engines

Tools





Technical values






Preliminary work

1. Switch off ignition and remove ignition key.
2. Remove bar ignition module. => 282020 Removing and installing DFI bar ignition modules - section on "Removing"

Removing spark plugs

1. Loosen spark plugs using special tool spark plug wrench 3122 B. => Loosening spark plugs using spark plug wrench





Loosening spark plugs using spark plug wrench

CAUTION

Broken spark plug electrodes

- 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.

2. Check electrode gap in V8 naturally aspirated engine. => Control value: 1.6 mm => Electrode gap of spark plug in V8 naturally aspirated engine





Electrode gap of spark plug in V8 naturally aspirated engine

3. Check electrode gap in V8 turbo engine.=> Control value: 0.8 mm+/-0.05 mm => Electrode gap of spark plug in V8 turbo engine





Electrode gap of spark plug in V8 turbo engine

Installing spark plugs

CAUTION

Broken spark plug electrodes

- 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.

Information

- Use only spark plugs approved by Porsche AG.

- Check electrode gap before screwing in a new spark plug.

CAUTION

Broken spark plug electrodes

- 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.

1. Check electrode gap in V8 naturally aspirated engine. => Control value: 1.6 mm => Electrode gap of spark plug in V8 naturally aspirated engine





Electrode gap of spark plug in V8 naturally aspirated engine

2. Check electrode gap in V8 turbo engine.=> Control value: 0.8 mm+/-0.05 mm => Electrode gap of spark plug in V8 turbo engine





Electrode gap of spark plug in V8 turbo engine

Information

- Use only spark plugs approved by Porsche AG.

- Check electrode gap before screwing in a new spark plug.

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





Tightening spark plugs using spark plug wrench

Subsequent work

1. Install bar ignition modules. => 282020 Removing and installing DFI bar ignition modules - section on "Installing"