Subaru Legacy (2005 year). Manual - part 306

IGNITION

IG(H4DOTC)

Page

1.

General Description ....................................................................................2

2.

Spark Plug...................................................................................................4

3.

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