Subaru Legacy IV (2008 year). Manual - part 77

EX(H4SO)-3

General Description

EXHAUST

B: CAUTION

• Wear appropriate work clothing, including a cap,
protective goggles and protective shoes when per-
forming any work.
• 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.
• Vehicle components are extremely hot after driv-
ing. Be wary of receiving burns from heated parts.
• 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 connectors of sensors or
units, be sure to disconnect the ground cable from
the battery.
• If any fat adheres to the exhaust pipe, wipe it off.
Otherwise a fire may happen.

(1)

Gasket

(15)

Center exhaust pipe front lower 
cover

(28)

Band

(2)

Spring

(29)

Muffler cutter (model with muffler 
cutter)

(3)

Chamber

(16)

Front oxygen (A/F) sensor

(4)

Rear exhaust pipe

(17)

Front catalytic converter

(30)

Hanger bracket (MT model)

(5)

Cushion rubber

(18)

Rear oxygen sensor

(31)

Hanger bracket (AT model)

(6)

Self-locking nut

(19)

Gasket

 

(7)

Gasket

(20)

Gasket

Tightening torque:N·m (kgf-m, ft-lb)

(8)

Muffler RH

(21)

Front exhaust pipe

T1: 7.5 (0.8, 5.5)

(9)

Muffler LH

(22)

Front exhaust pipe upper cover LH

T2: 13 (1.3, 9.6)

(10)

Center exhaust pipe front upper 
cover

(23)

Front exhaust pipe upper cover RH

T3: 18 (1.8, 13.3)

(24)

Front catalytic converter upper 
cover

T4: 21 (2.1, 15.5)

(11)

Rear catalytic converter upper 
cover

T5: 23 (2.3, 17.0)

(25)

Front catalytic converter lower 
cover

T6: 30 (3.1, 22.1)

(12)

Center exhaust pipe

T7: 35 (3.6, 25.8)

(13)

Rear catalytic converter

(26)

Front exhaust pipe lower cover RH

T8: 40 (4.1, 29.5)

(14)

Rear catalytic converter lower 
cover

(27)

Front exhaust pipe lower cover LH

T9: 48 (4.9, 35.4)

EX(H4SO)-4

Front Exhaust Pipe

EXHAUST

2. Front Exhaust Pipe

A: REMOVAL

CAUTION:
Vehicle components are extremely hot after
driving. Be wary of receiving burns from heated
parts.
1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.

3) Remove the air intake duct. <Ref. to IN(H4SO)-
8, REMOVAL, Air Intake Duct.>
4) Disconnect the front oxygen (A/F) sensor con-
nector (A) and rear oxygen sensor connector (B)
and remove the clip (C) fastening the harness.

5) Lift up the vehicle.
6) Remove the under cover.
7) Separate the center exhaust pipe from rear ex-
haust pipe.

8) Remove the nuts which hold front exhaust pipe
onto cylinder heads.

CAUTION:
Be careful not to drop the front and center ex-
haust pipe assembly.

9) Remove the bolt which holds center exhaust
pipe to hanger bracket.

10) Remove the front and center exhaust pipe as-
sembly from the vehicle.

CAUTION:
• Be careful not to let the front and center ex-
haust pipe assembly fall off when removing as
it is quite heavy.
• After removing the front and center exhaust
pipe assemblies, do not pull on the rear ex-
haust pipe with excessive force.
11) Separate the front exhaust pipe from center ex-
haust pipe.

12) Remove the front oxygen (A/F) sensor and rear
oxygen sensor. <Ref. to FU(H4SO)-35, REMOV-
AL, Front Oxygen (A/F) Sensor.> <Ref. to
FU(H4SO)-37, REMOVAL, Rear Oxygen Sensor.>

IN-00203

(C)

(B)

(A)

EX-02350

EX-02241

EX-02122

EX-02240

EX-02124

EX(H4SO)-5

Front Exhaust Pipe

EXHAUST

B: INSTALLATION

1) Install the front oxygen (A/F) sensor and rear ox-
ygen sensor to the front exhaust pipe. <Ref. to
FU(H4SO)-36, INSTALLATION, Front Oxygen (A/
F) Sensor.> <Ref. to FU(H4SO)-38, INSTALLA-
TION, Rear Oxygen Sensor.>
2) Install the front exhaust pipe to center exhaust
pipe.

NOTE:
Use a new gasket.

Tightening torque:

40 N·m (4.1 kgf-m, 29.5 ft-lb)

3) Install the front and center exhaust pipe assem-
bly to the vehicle.

NOTE:
Use a new gasket.
4) Temporarily tighten the nuts which hold front ex-
haust pipe to cylinder heads.

5) Tighten the bolt which holds center exhaust pipe
to rear exhaust pipe.

NOTE:
Use a new gasket.

Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

6) Tighten the bolt which holds center exhaust pipe
to hanger bracket.

Tightening torque:

35 N·m (3.6 kgf-m, 25.8 ft-lb)

7) Tighten the nuts which hold front exhaust pipe to
cylinder heads.

Tightening torque:

30 N·m (3.1 kgf-m, 22.1 ft-lb)

8) Install the under cover.
9) Lower the vehicle.

EX-02124

EX-02122

EX-02241

EX-02240

EX-02122

EX(H4SO)-6

Front Exhaust Pipe

EXHAUST

10) Connect the front oxygen (A/F) sensor connec-
tor (A) and rear oxygen sensor connector (B), and
fasten the harness with the clip (C).

11) Install the air intake duct. <Ref. to IN(H4SO)-8,
INSTALLATION, Air Intake Duct.>
12) Connect the ground cable to battery.

C: INSPECTION

1) Check the connections and welds for exhaust
leaks.
2) Make sure there are no holes or rusting.

(C)

(B)

(A)

EX-02350

IN-00203