1999 SUBARU LEGACY catalytic converter

1. Front Catalytic Converter
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Disconnect front oxygen sensor connector.
B2M1979A
S2M0127A
3) Disconnect rear oxygen sensor connector.
(2500 cc California spec. vehicles)
S2M0128
4) Lift-up the vehicle.
5) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
6) Separate center exhaust pipe from front cata-
lytic converter.
S2M0052
7) Remove bolts which hold front exhaust pipe
onto cylinder heads.
CAUTION:
Be careful not to pull down front exhaust pipe
and center exhaust pipe.
S2M0236
2
2-1[W1A0]SERVICE PROCEDURE
1. Front Catalytic Converter

8) Separate front catalytic converter from front
exhaust pipe.
S2M0053
B: INSTALLATION
CAUTION:
Replace gaskets with new ones.
1) Install front catalytic converter to front exhaust
pipe and center exhaust pipe.
Tightening torque:
30
±5 N´m (3.1±0.5 kg-m, 22.4±3.6 ft-lb)
S2M0053
2) Tighten bolts which hold front exhaust pipe onto
cylinder heads.
Tightening torque:
30
±5 N´m (3.1±0.5 kg-m, 22.4±3.6 ft-lb)
S2M0236
3) Install center exhaust pipe to front catalytic con-
verter.
Tightening torque:
35
±5 N´m (3.6±0.5 kg-m, 26.0±3.6 ft-lb)
S2M0052
4) Connect rear oxygen sensor connector. (Except
2500 cc California spec. vehicles)
B2M0312
5) Lower the vehicle.
6) Connect rear oxygen sensor connector. (2500
cc California spec. vehicles)
S2M0128
3
[W1B0]2-1SERVICE PROCEDURE
1. Front Catalytic Converter

7) Connect front oxygen sensor connector.
B2M1979A
S2M0127A
8) Connect battery ground cable.
B2M1723
2. Rear Catalytic Converter
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Lift-up the vehicle.
3) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
4) Separate center exhaust pipe and rear catalytic
converter assembly from rear exhaust pipe.
B2M0055
4
2-1[W2A0]SERVICE PROCEDURE
2. Rear Catalytic Converter

7) Connect front oxygen sensor connector.
B2M1979A
S2M0127A
8) Connect battery ground cable.
B2M1723
2. Rear Catalytic Converter
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Lift-up the vehicle.
3) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
4) Separate center exhaust pipe and rear catalytic
converter assembly from rear exhaust pipe.
B2M0055
4
2-1[W2A0]SERVICE PROCEDURE
2. Rear Catalytic Converter

5) Separate center exhaust pipe and rear catalytic
converter assembly from front catalytic converter.
S2M0052
6) Remove center exhaust pipe and rear catalytic
converter assembly from hanger bracket.
CAUTION:
IBe careful not to pull down center exhaust
pipe.
IAfter removing center exhaust pipe, do not
apply excessive pulling force on front catalytic
converter and front exhaust pipe.
B2M0313
B: INSTALLATION
CAUTION:
Replace gaskets with new ones.
1) Install center exhaust pipe and rear catalytic
converter assembly.
Temporarily tighten bolt which installs center
exhaust pipe to hanger bracket.
B2M0313
2) Install center exhaust pipe to front catalytic con-
verter.
Tightening torque:
35
±5 N´m (3.6±0.5 kg-m, 26.0±3.6 ft-lb)
S2M0052
3) Install center exhaust pipe to rear exhaust pipe.
Tightening torque:
18
±5 N´m (1.8±0.5 kg-m, 13.0±3.6 ft-lb)
B2M0055
4) Tighten bolt which holds center exhaust pipe to
hanger bracket.
Tightening torque:
35
±5 N´m (3.6±0.5 kg-m, 26.0±3.6 ft-lb)
B2M0313
5
[W2B0]2-1SERVICE PROCEDURE
2. Rear Catalytic Converter

12) Drain engine oil.
Set container under the vehicle, and remove drain
plug from oil pan.
G2M0066
13) Disconnect connector from rear oxygen sen-
sor. (Except 2500 cc California spec. vehicles)
B2M0312
14) Remove front exhaust pipe.
(1) Separate front catalytic converter from cen-
ter exhaust pipe.
B2M0421
(2) Remove front exhaust pipe from engine.
S2M0236
(3) Remove bolt which installs front exhaust
pipe on bracket.
15) Remove nuts which install front cushion rub-
ber onto front crossmember.
G2M0293
16) Remove bolts which install oil pan on cylinder
block while raising up engine.
B2M2687A
S2M0131A
17) Insert oil pan cutter blade between cylinder
block-to-oil pan clearance.
CAUTION:
Do not use a screwdriver or similar tool in
place of oil pan cutter.
12
2-4[W2A0]SERVICE PROCEDURE
2. Oil Pan and Oil Strainer

(1) Upper front exhaust pipe cover
CTR
(2) Lower front exhaust pipe cover
CTR
(3) Band RH
(4) Band LH
(5) Upper front exhaust pipe cover
LH
(6) Lower front exhaust pipe cover
LH
(7) Front exhaust pipe
(8) Lower front exhaust pipe cover
RHUpper front exhaust pipe
cover RH
(9) Gasket
(10) Spring(11) Rear exhaust pipe
(12) Self-locking nut
(13) Gasket
(14) Gasket
(15) Muffler
(16) Cushion rubber
(17) Clamp
(18) Upper center exhaust pipe cover
(19) Center exhaust pipe
(20) Clamp B
(21) Upper rear catalytic converter
cover
(22) Lower rear catalytic converter
cover
(23) Gasket
(24) Front oxygen sensor(25) Rear oxygen sensor
(26) Front catalytic converter
(27) Front catalytic converterLower
front catalytic converter cover
(28) Upper front catalytic converter
cover
Tightening torque: N´m (kg-m, ft-lb)
T1:
13±3 (1.3±0.3, 9.4±2.2)
T2:18±5 (1.8±0.5, 13.0±3.6)
T3:30±5 (3.1±0.5, 22.4±3.6)
T4:35±5 (3.6±0.5, 26.0±3.6)
T5:48±5 (4.9±0.5, 35.4±3.6)
3
[C1A0]2-9COMPONENT PARTS
1. Exhaust System

B: 2500 cc MODEL
S2M0155A
(1) Upper front exhaust pipe cover
CTR
(2) Lower front exhaust pipe cover
CTR
(3) Band RH
(4) Band LH
(5) Upper front exhaust pipe cover
LH
(6) Lower front exhaust pipe cover
LH
(7) Front exhaust pipe
(8) Lower front exhaust pipe cover
RH
(9) Upper front exhaust pipe cover
RH
(10) Gasket
(11) Spring(12) Rear exhaust pipe
(13) Self-locking nut
(14) Gasket
(15) Muffler
(16) Cushion rubber
(17) Clamp
(18) Upper center exhaust pipe cover
(19) Center exhaust pipe
(20) Clamp B
(21) Upper rear catalytic converter
cover
(22) Lower rear catalytic converter
cover
(23) Gasket
(24) Front oxygen sensor
(25) Rear oxygen sensor (California
spec. vehicles)(26) Rear oxygen sensor (Except
California spec. vehicles)
(27) Front catalytic converter
(28) Lower front catalytic converter
cover
(29) Upper front catalytic converter
cover
Tightening torque: N´m (kg-m, ft-lb)
T1:
13±3 (1.3±0.3, 9.4±2.2)
T2:18±5 (1.8±0.5, 13.0±3.6)
T3:30±5 (3.1±0.5, 22.4±3.6)
T4:35±5 (3.6±0.5, 26.0±3.6)
T5:48±5 (4.9±0.5, 35.4±3.6)
4
2-9[C1B0]COMPONENT PARTS
1. Exhaust System