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Home >> Subaru >> 2007 >> Impreza Outback Sport, Standard >> Repair and Diagnosis >> Maintenance >> Procedures >> General Information >> Periodic Maintenance Procedures >> Spark Plug >> Replacement >> DOHC Model

DOHC Model

  1. Disconnect the battery cables, and then remove the battery and battery carrier.
  2. Remove the air cleaner lower case.
  3. Disconnect the connector from ignition coil and ignitor assembly.
  4. Remove the ignition coil and ignitor assembly.
    Fig 1: Identifying Ignition Coil And Ignitor Assembly Connector
    G04997234Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the spark plug with a spark plug socket.
    Fig 2: Identifying Spark Plug With Spark Plug Socket
    G04997235Courtesy of SUBARU OF AMERICA, INC.
  6. Install a new spark plug.

    Recommended spark plug: 

    NGK: ILFR6B 

  7. Tighten the spark plug lightly with hand, and then secure with a plug-wrench to the specified torque.

    Tightening torque: 

    21 N.m (2.1 kgf-m, 15.2 ft-lb) 

  8. Tighten the ignition coil and ignitor assembly.

Tightening torque: 

16 N.m (1.6kgf-m, 11.7 ft-lb) 

NOTE:
  • Be sure to place the gasket between the cylinder head and spark plug.
  • If the torque wrench is not available, tighten the spark plug until gasket contacts cylinder head; then tighten further 1/4 to 1/2 turns.
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