Subaru Legacy (2005 year). Service manual — part 306
IGNITION
IG(H4DOTC)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Spark Plug. . . . . . . . . . . . . . . . . . . . . . . . ...4
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . .6
IG(H4DOTC)-2
IGNITION
General Description
1. General Description
A: SPECIFICATION
B: COMPONENT
Item
Specification
Ignition coil
Model
FK0186
Ignition system
Independent ignition coil
Manufacturer
Diamond Electric
Spark plug
Manufacturer and type
NGK: ILFR6B
Thread size (diameter, pitch, length)
mm
14, 1.25, 26.5
Spark plug gap
mm (in)
0.7 — 0.8 (0.028 — 0.031)
Electrode
Iridium
(1)
Spark plug
Tightening torque: N
⋅
m (kgf-m, ft-lb)
(2)
Ignition coil
T1: 21 (2.1, 15.2)
T2: 16 (1.6, 11.7)
IG-00098
(1)
T1
T2
T1
(1)
(2)
(2)
T2
IG(H4DOTC)-3
IGNITION
General Description
C: CAUTION
• Wear work clothing, including a cap, protective
goggle and protective shoes during operation.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust and dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly and replacement.
• Be careful not to burn yourself, because each
part on the vehicle is hot after running.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or rigid racks at the specified
points.
• Before disconnecting electrical connectors of
sensors or units, be sure to disconnect the ground
cable from battery.
IG(H4DOTC)-4
IGNITION
Spark Plug
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.
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.
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 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
⋅
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 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.
IN-00203
IG-00092
IG-00093
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