SsangYong Stavic / SsangYong Rodius (2005 year). Service manual — part 63

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ENGINE INTAKE & EXHAUST

M162 GSL ENG SM - 2005.7

ENGINE INTAKE & EXHAUST

00

SECTION 1G

Table of Contents

DESCRIPTION AND OPERATION . . . . . . . . .. 1G-2

Exhaust system . . . . . . . . . . . . . . .. 1G-2

Muffler . . . . . . . . . . . . . . . . . . 1G-2

Catalytic converter . . . . . . . . . . . . . . 1G-2

Catalytic converte structure . . . . . . . . . ... 1G-3

Catalytic converter and temperature . . . . . . . 1G-3

Purification of catalytic converter . . . . . . . .. 1G-4

Resonance flap . . . . . . . . . . . . . . .. 1G-5

REPAIR INSTRUCTIONS . . . . . . . . . . . . 1G-6

ON-VEHICLE SERVICE . . . . . . . . . . . . .. 1G-6

Air cleaner and intake air duct . . . . . . . . .. 1G-6

Intake manifold . . . . . . . . . . . . . . ... 1G-9

Resonance flap . . . . . . . . . . . . . . 1G-10

Exhaust line . . . . . . . . . . . . . . . .. 1G-11

SPECIFICATIONS . . . . . . . . . . . . . . . 1G-14

Fastener tightening specifications . . . . . . .. 1G-14

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ENGINE INTAKE & EXHAUST

M162 GSL ENG SM - 2005.7

DESCRIPTION AND OPERATION

EXHAUST SYSTEM

Notice

When you are inspecting or replacing exhaust system
components, make sure there is adequate clearance
from all points on the underbody to avoid possible
overheating of the floor panel and possible damage
to the passenger compartment insulation and trim
materials.

Check the complete exhaust system and the nearby body
areas and trunk lid for broken, damaged, missing or
mispositioned parts, open seams, holes, loose
connections, or other deterioration which could permit
exhaust fumes to seep into the trunk may be an indica-
tion of a problem in one of these areas. Any defects should
be corrected immediately.

MUFFLER

Aside from the exhaust manifold connection, the exhaust
system uses a flange and seal joint design rather than a
slip joint coupling design with clamp and U-bolts. If hole,
open seams, or any deterioration is discovered upon in-
spection of the front muffler and pipe assembly, the com-
plete assembly should be replace, the complete assem-
bly should be replaced. The same procedure is applicable
to the rear muffler assembly.

Heat shields for the front and rear muffler assembly and
catalytic converter protect the vehicle and the environ-
ment from the high temperatures that the exhaust sys-
tem develops.

CATALYTIC CONVERTER

Notice

When jacking or lifting the vehicle from the body side
rails, be certain that the lift pads do not contact the
catalytic converter, as this could damage the catalytic
converter.

Notice

Use of anything other than unleaded fuel will damage
the catalyst in the catalytic converter.

The catalytic converter are emission-control devices added
to the exhaust system to reduce pollutants from the ex-
haust pipes.

The oxidation catalyst is coated with a catalytic material
containing platinum and palladium, which reduces levels
of hydrocarbon (HC) and carbon monoxide (CO) from the
exhaust gas. The three-way catalyst has coatings which
contain platinum and rhodium, which additionally lower
the levels of oxides of nitrogen (NOx).

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CATALYTIC CONVERTER AND TEM-
PERATURE

Catalytic converter has the normal function of purification at a
range of the temperature.

Because it has a weak point of decreasing of the purification
rate in the condition of continuous high temperature, it should
keep the temperature range of 400 to 500°C for normal condition.

HC purification rate becomes better according to the increase
of temperature in the normal range of temperature.

CO purification rate becomes the best near the temperature of
450°C, and NO

x

does so near the temperature of 400 to 500°C.

CATALYTIC CONVERTE STRUCTURE

The Catalytic converter of monolith type consists of 2 walled
metal bodies which is made of Cordierite.

The principal element of converter consists of the materials
like Alumina or oxidized Serume in order to apply to Ceramic
Monolith.

Washer coat operates first, and catalytic metal elements (Pt,
Pd, Rh) operates to washer coat next.

Monolith type is lighter than other types, easy to manufacture
and quickly approaches to proper temperature.

Washer coat is used to make a contact surface with exhaust
gas bigger by adhering closely to small holes of inner layer.

If a lead compound or phosphorus adheres to the surface and
the temperature rises, its surface is decreased.

The total area of general monolith converter is about 45,000 ~
500,000 ft

3

. (10 times of a football field)

Generally Alumina (AL

2

O

3

) is used as a raw material and its 7

phases of gamma, delta, theta have big areas and high stabil-
ity for the temperature, and nowadays gamma Alumina is used
usually.

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• Oxygen adheres to catalytic material : below 180°C

• Catalytic material supplies each CO and HC with O

2

for

their oxidation : above 180°C

• Catalytic material conversion process by DOC

PURIFICATION OF CATALYTIC
CONVERTER

• Adhesion of soluble organic fraction (SOF) below 180°C

• Purification of soluble organic fraction (SOF) over 180°C

Chemical reaction formula

- SOF(HC)+O

2

→

CO

2

+H

2

O

- 2CO+O

2

→

2CO

2

- 2C

2

H

6

+7O

2

→

4CO

2

+6H

2

0

• By catalytic action of two primary catalytic converter,

oxidation occurs in order to decrease HC and CO.