Daewoo Nubira. Manual — part 142

ENGINE EXHAUST 1G – 3

DAEWOO V–121 BL4

MAINTENANCE AND REPAIR

ON–VEHICLE SERVICE

MAIN CATALYTIC CONVERTER AND
CONNECTING PIPE

Removal Procedure

1. Remove the post–converter heated oxygen sensor.

2. Remove the connecting pipe nuts and the gasket

from the auxiliary catalytic converter.

3. Remove the catalytic converter nuts and the gasket

from the front muffler.

4. Disconnect the main catalytic converter and the

connecting pipe from the rubber hanger.

1G – 4

I

ENGINE EXHAUST

DAEWOO V–121 BL4

Installation Procedure

1. Install the catalytic converter and the gasket to the

front muffler. Use the nuts to secure the converter.

Tighten

Tighten the catalytic converter–to–front muffler pipe
nuts to 30 N

S

m (22 lb–ft).

2. Connect the main catalytic converter and the con-

necting pipe to the rubber hanger.

3. Install the gasket and the connecting pipe nuts to

the auxiliary catalytic converter.

Tighten

Tighten the front connecting pipe–to–auxiliary cata-
lytic converter nuts to 35 N

S

m (26 lb–ft).

4. Install the post–converter heated oxygen sensor.

Tighten

Tighten the post–converter heated oxygen sensor to
41 N

S

m (30 lb–ft).

ENGINE EXHAUST 1G – 5

DAEWOO V–121 BL4

AUXILIARY CATALYTIC CONVERTER

Removal Procedure

1. Disconnect the pre–converter oxygen sensor elec-

trical connector.

2. Remove the exhaust manifold cover bolts and the

exhaust manifold cover.

3. Remove the auxiliary catalytic converter upper

flange nuts.

1G – 6

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ENGINE EXHAUST

DAEWOO V–121 BL4

4. Remove the auxiliary catalytic converter lower

flange nuts.

5. Remove the auxiliary catalytic converter and the

gaskets.

Installation Procedure

1. Install the auxiliary catalytic converter and the gas-

kets.

Important : Position the auxiliary catalytic converter onto
the exhaust manifold flange with one upper flange nut and
bolt.

2. Install the auxiliary catalytic converter lower flange

nuts and the bolts.

Tighten

Tighten the front connecting pipe–to–auxiliary cata-
lytic converter nuts to 35 N

S

m (26 lb–ft).

3. Install the remaining auxiliary catalytic converter

upper flange nuts.

Tighten

Tighten the auxiliary catalytic converter–to–exhaust
manifold nuts to 35 N

S

m (26 lb–ft).