Spark plugs with 3 electrodes

Fig 1: Identifying Spark Plug With 3 Electrodes

Courtesy of VOLVO CARS OF NORTH AMERICA.

Normally aspirated engine: 

• Lubricate the spark plug threads with paste.
  NOTE: Spark plugs with 3 electrodes. Cannot be adjusted. The gaps listed and that can be measured are between the insulator and side electrode. Nominal measurement: 0.5 mm (0.02 in).

  P/N: 116 1408.

  Tighten to 30 Nm (22 lb.ft)  .

Fig 2: Identifying Underhood View

Courtesy of VOLVO CARS OF NORTH AMERICA.

Install: 

• the ignition coils.

  Check the marking.

  Tighten to 10 Nm (7.4 lb.ft)  .

• the cover over the ignition coils.

  Tighten to 8 Nm (6 lb.ft)  .

• the upper camshaft belt cover.

  Tighten to 8 Nm (6 lb.ft)  .

• any charge air pipe over the engine.

  Remove the seals from the openings.