Subaru Legacy 2005 Service Manual page 1691

6) Remove the spark plug with a spark plug socket.
(B)
(A)
(A) Ratchet handle
(B) Extension bar
(C) Universal joint
(D) Spark plug socket
B: INSTALLATION
1. 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.
Spark Plug
IG-02007
(B) (C) (D)
IG-02011
IG(H6DO)-5
2. 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.
C: INSPECTION
Check the electrodes and inner and outer ceramic
insulator of plugs, noting the type of deposits and
the degree of electrode erosion.
(A)
(B)
(E)
(A) Spark plug gap
(B) Carbon accumulation or wear
(C) Crack
(D) Damage
(E) Damaged gasket
1) Normal:
Brown to grayish-tan deposits and slight electrode
wear indicate correct spark plug heat range.
IGNITION
(C)
(D)
IG-00010
IG-00011