Subaru LEGACY 2006 Manual page 739

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IGNITION
2. Spark Plug
A: REMOVAL
CAUTION:
All spark plugs installed on an engine must be
of the same heat range.
Spark plug:
<Ref. to IG(H4SO)-2, SPECIFICATION, Gener-
al Description.>
1. RH SIDE
1) Disconnect the ground cable from the battery.
2) Remove the air cleaner case. <Ref. to
IN(H4SO)-5, REMOVAL, Air Cleaner Case.>
3) Remove the spark plug cords by pulling the boot.
(Do not pull the cord itself.)
4) Remove the spark plug with a spark plug socket.
Spark Plug
2. LH SIDE
1) Remove the battery. <Ref. to SC(H4SO)-27,
REMOVAL, Battery.>
2) Remove the spark plug cords by pulling the boot.
(Do not pull the cord itself.)
3) Remove the spark plug with a spark plug socket.
IN-00203
B: INSTALLATION
1. RH SIDE
Install in the reverse order of removal.
Tightening torque:
21 N·m (2.1 kgf-m, 15.2 ft-lb)
NOTE:
The tightening torque described above should be
applied to only new spark plugs without oil on their
IG-00017
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.
2. LH SIDE
Install in the reverse order of removal.
Tightening torque:
21 N·m (2.1 kgf-m, 15.2 ft-lb)
NOTE:
The tightening torque described above should be
IG-00018
applied to only 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.
IG(H4SO)-4
IG-02049
IG-00022