2005 Subaru Outback F6-3.0LFACTORY OEM SERVICE PROCEDURE

Spark Plug: Service and Repair

Ignition System:

Factory service manual diagram





Spark Plug

REMOVAL

CAUTION: All spark plugs installed on an engine must be of the same heat range.

RH SIDE
1. Remove the collector cover.

Factory service manual diagram



2. Disconnect the ground cable from battery.
3. Remove the air cleaner case.
4. Remove the bracket.
5. Disconnect the connector from ignition coil.

Factory service manual diagram



6. Remove the ignition coil.

NOTE: Turn the #5 ignition coil to remove it.

Factory service manual diagram



Factory service manual diagram



7. Remove the spark plug with a spark plug socket.

LH SIDE
1. Remove the collector cover.
2. Remove the battery and battery carrier.
3. Remove the bracket.
4. Disconnect the connector from ignition coil.

Factory service manual diagram



5. Remove the ignition coil.

NOTE: Turn the #6 ignition coil to remove it.

Factory service manual diagram



Factory service manual diagram



6. Remove the spark plug with a spark plug socket.

INSTALLATION

RH SIDE
Install in the reverse order of removal.

Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15.2 ft-lb)
Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 11.7 ft-lb)

NOTE:
- The above torque should be only applied to new spark plugs without oil on their threads.
- In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.

LH SIDE
Install in the reverse order of removal.

Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15.2 ft-lb)
Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 11.7 ft-lb)

NOTE:
- The above torque should be only applied to new spark plugs without oil on their threads.
- In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.