Subaru 2012 Legacy User manual

FUJI HEAVY INDUSTRIES LTD. G2320GE3

2004 LEGACY SERVICE MANUAL QUICK REFERENCE INDEX

ENGINE SECTION 2

This service manual has been prepared

to provide SUBARU service personnel

with the necessary information and data

for the correct maintenance and repair

of SUBARU vehicles.

This manual includes the procedures

for maintenance, disassembling, reas-

sembling, inspection and adjustment of

components and diagnostics for guid-

ance of experienced mechanics.

Please peruse and utilize this manual

fully to ensure complete repair work for

satisfying our customers by keeping

their vehicle in optimum condition.

When replacement of parts during

repair work is needed, be sure to use

SUBARU genuine parts.

All information, illustration and specifi-

cations contained in this manual are

based on the latest product information

available at the time of publication

approval.

FUEL INJECTION (FUEL SYSTEMS) FU(H4DOTC)

EMISSION CONTROL

(AUX. EMISSION CONTROL DEVICES) EC(H4DOTC)

INTAKE (INDUCTION) IN(H4DOTC)

MECHANICAL ME(H4DOTC)

EXHAUST EX(H4DOTC)

COOLING CO(H4DOTC)

LUBRICATION LU(H4DOTC)

SPEED CONTROL SYSTEMS SP(H4DOTC)

IGNITION IG(H4DOTC)

STARTING/CHARGING SYSTEMS SC(H4DOTC)

ENGINE (DIAGNOSTICS) EN(H4DOTC)(diag)

IGNITION IG(H4DOTC)

Page

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

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

3. Ignition Coil & Ignitor ASSY ........................................................................7

IG(H4DOTC)-2

IGNITION General Description

1. General Description

A: SPECIFICATION

B: COMPONENT

Item Specification

Ignition coil & ignitor

ASSY

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, 19

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 & ignitor ASSY T1: 21 (2.1, 15.2)

T2: 16 (1.6, 11.7)

IG-00098

(1)

(2)

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

IG(H4DOTC)-5

IGNITION

Spark Plug

C: INSPECTION

Check the electrodes and inner and outer ceramic

insulator of plugs, noting the type of deposits and

the degree of electrode erosion.

1) Normal:

Brown to grayish-tan deposits and slight electrode

wear indicate correct spark plug heat range.

2) Carbon fouled:

Dry fluffy carbon deposits on insulator and elec-

trode are mostly caused by slow speed driving in

the city, weak ignition, too rich fuel mixture, dirty air

cleaner, etc.

It is advisable to replace with plugs having hotter

heat range.

3) Oil fouled:

Wet black deposits show excessive oil entrance

into combustion chamber through worn rings and

pistons or excessive clearance between valve

guides and stems. If the same condition remains

after repair, use a hotter plug.

4) Overheating:

White or light gray insulator with black or brown

spots and bluish burnt electrodes indicate engine

overheating. Moreover, the appearance results

from incorrect ignition timing, loose spark plugs,

wrong selection of fuel, hotter range plug, etc. It is

advisable to replace with plugs having colder heat

range.

(A) Spark plug gap

(B) Carbon accumulation or wear

(D) Damage

(E) Damaged gasket

IG-0201

(A)

(B)

(E) (C)

(D)

IG-0001

IG(H4DOTC)-6

IGNITION Spark Plug

D: ADJUSTMENT

Clean the spark plugs using a wire brush.

Clean and remove the carbon or oxide deposits.

But do not wear away ceramic insulator.

If deposits are too stubborn, replace the plugs.

After cleaning the spark plugs, correct the spark

plug gap using a gap gauge.

NOTE:

Do not use a plug cleaner because the spark plugs

are applied with iridium tip.

Spark plug gap: L

0.7 — 0.8 mm (0.028 — 0.031 in)

NOTE:

Replace with a new spark plug if this area (A) is

worn to “ball” shape.

IG-0001

L(A)

IG(H4DOTC)-7

IGNITION

Ignition Coil & Ignitor ASSY

3. Ignition Coil & Ignitor ASSY

A: REMOVAL

Direct ignition type has been adopted. Refer to

“Spark Plug” for removal procedure. <Ref. to

IG(H4DOTC)-4, REMOVAL, Spark Plug.>

B: INSTALLATION

Install in the reverse order of removal.

Tightening torque:

16 N

⋅

m (1.6 kgf-m, 11.7 ft-lb)

C: INSPECTION

For inspection procedure, refer to “Diagnostics for

Engine Starting Failure”. <Ref. to EN(H4DOTC)(di-

ag)-48, IGNITION CONTROL SYSTEM, Diagnos-

tics for Engine Starting Failure.>

IG(H4DOTC)-8

IGNITION Ignition Coil & Ignitor ASSY

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