Subaru Legacy IV (2008 year). Manual - part 492

EX(H6DO)-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)

Front catalytic converter upper 
cover (RH)

(11)

Front catalytic converter lower 
cover (LH)

(23)

Rear exhaust pipe

(24)

Cushion rubber

(2)

Front catalytic converter lower 
cover (RH)

(12)

Front exhaust pipe (LH)

(25)

Self-locking nut

(13)

Front catalytic converter (LH)

(26)

Gasket

(3)

Gasket

(14)

Front oxygen (A/F) sensor (LH)

 

 

(4)

Front exhaust pipe (RH)

(15)

Rear oxygen sensor (LH)

Tightening torque:N·m (kgf-m, ft-lb)

(5)

Front catalytic converter (RH)

(16)

Muffler (RH)

T1: 13 (1.3, 9.6)

(6)

Front oxygen (A/F) sensor (RH)

(17)

Muffler (LH)

T2: 18 (1.8, 13.3)

(7)

Rear oxygen sensor (RH)

(18)

Rear catalytic converter

T3: 21 (2.1, 15.5)

(8)

Gasket

(19)

Bracket

T4: 30 (3.1, 22.1)

(9)

Gasket

(20)

Gasket

T5: 35 (3.6, 25.8)

(10)

Front catalytic converter upper 
cover (LH)

(21)

Spring

T6: 48 (4.9, 35.4)

(22)

Chamber

EX(H6DO)-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) Lift up the vehicle.
4) Remove the under cover.
5) Disconnect the front oxygen (A/F) sensor con-
nector (A) and rear oxygen sensor connector (B).

6) Separate the front exhaust pipe assembly from
the rear exhaust pipe.

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

CAUTION:
Be careful not to drop the front exhaust pipe as-
sembly.

8) Remove the bolts which hold front exhaust pipe
assembly to hanger bracket.

9) Remove the front exhaust pipe assembly from
vehicle.

CAUTION:
• Be careful not to let the front exhaust pipe as-
sembly fall off when removing, since it is very
heavy.
• After removing the front exhaust pipe assem-
bly, do not apply excessive pulling force on the
rear exhaust pipe.
10) Separate the front exhaust pipe (RH) from front
exhaust pipe assembly.

11) Remove the front oxygen (A/F) sensor and rear
oxygen sensor. <Ref. to FU(H6DO)-32, REMOV-
AL, Front Oxygen (A/F) Sensor.> <Ref. to
FU(H6DO)-34, REMOVAL, Rear Oxygen Sensor.>

IN-00203

EX-02014

(A)

(B)

EX-02015

EX-02016

EX-00061

EX-02017

EX(H6DO)-5

Front Exhaust Pipe

EXHAUST

B: INSTALLATION

1) Install the front oxygen (A/F) sensor and rear ox-
ygen sensor. <Ref. to FU(H6DO)-33, INSTALLA-
TION, Front Oxygen (A/F) Sensor.> <Ref. to
FU(H6DO)-35, INSTALLATION, Rear Oxygen
Sensor.>
2) Install the front exhaust pipe (RH) to the front ex-
haust pipe (LH).

NOTE:
Use a new gasket.

Tightening torque:

30 N·m (3.1 kgf-m, 22.1 ft-lb)

3) Install the front exhaust pipe assembly to vehi-
cle.
4) Temporarily tighten the nuts which hold front ex-
haust pipe assembly onto cylinder heads.

NOTE:
Use a new gasket.

5) Temporarily tighten the bolts which hold front ex-
haust pipe assembly to hanger bracket.

6) Tighten the bolts which install front exhaust pipe
to rear exhaust pipe.

NOTE:
Use a new gasket.

Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

7) Tighten the bolts which hold front exhaust pipe
assembly to hanger bracket.

Tightening torque:

35 N·m (3.6 kgf-m, 25.8 ft-lb)

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

Tightening torque:

30 N·m (3.1 kgf-m, 22.1 ft-lb)

9) Install the under cover.

EX-02017

EX-02016

EX-00061

EX-02015

EX-00061

EX-02016

EX(H6DO)-6

Front Exhaust Pipe

EXHAUST

10) Connect the front oxygen (A/F) sensor connec-
tor (A) and rear oxygen sensor connector (B).

11) Lower the vehicle.
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.

EX-02014

(A)

(B)

IN-00203