Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Subaru Outback F6-3.0LFACTORY OEM SERVICE PROCEDURE
Spark Plug: Service and Repair
Ignition System:
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.
2. Disconnect the ground cable from battery.
3. Remove the air cleaner case.
4. Remove the bracket.
5. Disconnect the connector from ignition coil.
6. Remove the ignition coil.
NOTE: Turn the #5 ignition coil to remove it.
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.
5. Remove the ignition coil.
NOTE: Turn the #6 ignition coil to remove it.
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
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
