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.
2004 Subaru Outback F6-3.0LFACTORY OEM SERVICE PROCEDURE
Removal and Installation
Ignition System:
REMOVAL
CAUTION: All spark plugs installed on an engine, must be of the same heat range.
Spark plug:
NGK: PLFR6A-11
RH SIDE
1. Disconnect battery ground cable.
2. Remove air cleaner lower case.
3. Disconnect connector from ignition coil.
4. Remove ignition coil.
5. Remove spark plugs with the spark plug socket.
LH SIDE
1. Disconnect battery cables and then remove battery and battery carrier.
2. Disconnect washer motor connector.
3. Remove the two bolts which hold the washer tank, then take the tank away from the working area.
4. Disconnect connector from ignition coil.
5. Remove ignition coil.
6. Remove spark plug with the spark plugs socket.
INSTALLATION
RH SIDE
Install in the reverse order of removal.
Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15 ft-lb)
CAUTION: 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 approximately 1/3 of the specified torque in order to avoid over-stressing.
Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 12 ft-lb)
LH SIDE
Install in the reverse order of removal.
Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15 ft-lb)
CAUTION: 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 approximately 1/3 of the specified torque in order to avoid over-stressing.
Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 12 ft-lb)
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.
