SsangYong Actyon Sports II. Service manual - part 70

03-3

1713-08

1. SPECIFICATIONS

(1) Fastener Tightening Specifications

04-3

2420-01

1. SPECIFICATION

(1) Fastener Tightening Specifications

04-4

1. DESCRIPTION AND OPERATION

1) Exhaust System

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 indication of a problem in one of these 

areas. Any defects should be corrected immediately.

2) Catalytic Converter (Gasoline Engine)

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.

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

1.

2.

Catalytic Converter 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, 000~500,000ft3. (10 

times of a football field) Generally Alumina (AL2 O3) is 

used as a raw materialand its 7 phases of gamma, 

delta, theta have big areas and high stability for the 

temperature, and nowadays gamma Alumina is used 

usually.

04-5

2420-01

Catalytic Converter and Temperature

▶

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 NOx 

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

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)+O2 → CO2+H2O
2CO+O2 → 2CO2
2C2H6+7O2 → 4CO2+6H20

By catalytic action of two primary catalytic 

converter, oxidation occurs in order to 

decrease HC and CO.

-

Oxygen adheres to catalytic 

material : below 180°C

Catalytic material supplies each 

CO and HC with O2 for their 

oxidation : above 180°C

Catalytic material conversion 

process by DOC