Subaru Legacy 2005 Service Manual page 1236

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(H4DOTC)-2, SPECIFICATION,
General Description.>
1. RH SIDE
1) Remove the collector cover.
2) Disconnect the ground cable from battery.
3) Remove the air cleaner case.
<Ref. to IN(H4DOTC)-8, REMOVAL, Air Cleaner
Case.>
4) Disconnect the connector from ignition coil.
5) Remove the ignition coil.
NOTE:
Turn the #3 ignition coil by 180° to remove it.
6) Remove the spark plug with a spark plug socket.
Spark Plug
2. LH SIDE
1) Remove the collector cover.
2) Remove the battery and battery carrier.
3) Disconnect the connector from ignition coil.
4) Remove the ignition coil.
NOTE:
Turn the #4 ignition coil by 180° to remove it.
5) Remove the spark plug with a spark plug socket.
B: INSTALLATION
1. RH SIDE
Install in the reverse order of removal.
IN-00203
Tightening torque (Spark plug):
21 N
Tightening torque (Ignition coil):
16 N
NOTE:
The above torque should only be 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.
2. LH SIDE
Install in the reverse order of removal.
Tightening torque (Spark plug):
21 N
Tightening torque (Ignition coil):
IG-00092
16 N
NOTE:
The above torque should only be 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.
IG(H4DOTC)-4
⋅
m (2.1 kgf-m, 15.2 ft-lb)
⋅
m (1.6 kgf-m, 11.7 ft-lb)
⋅
m (2.1 kgf-m, 15.2 ft-lb)
⋅
m (1.6 kgf-m, 11.7 ft-lb)
IG-00093