Chery Tiggo 5 (T21). Service manual — part 146

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SQR484F EXHAUST SYSTEM

GENERAL INFORMATION

Description

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RT21110010

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Exhaust system is used to control the engine exhaust, reducing vehicle emissions by precatalytic converter
and main catalytic converter, and eliminating exhaust noise by muffler. When exhaust system discharges
exhaust gas, the oxygen sensor monitors oxygen content in the exhaust gas. The engine control module
adjusts the air-fuel ratio of flammable gas mixture to control vehicle emissions and achieve optimal fuel
economy according to feedback signals of the oxygen sensor and combining with other sensor signals.

Specifications

Torque Specifications

1 - Exhaust Manifold Assembly Gasket

2 - Exhaust Manifold Assembly

3 - Exhaust Manifold Heat Insulator

4 - Precatalytic Converter Assembly Gasket

5 - Upstream Oxygen Sensor

6 - Precatalytic Converter Assembly

7 - Downstream Oxygen Sensor

8 - Gasket

9 - Diamond Shaped Hanger Block

10 - Main Catalytic Converter Assembly

11 - Center Pipe Assembly

12 - Spring Bolt

13 - Sphere Flange Grommet

14 - Muffler Assembly Heat Insulator I

15 - Muffler Assembly Heat Insulator II

16 - Hanger Block III Assembly

17 - Muffler Assembly

Description

Torque (N·m)

Exhaust Manifold Heat Insulator Fixing Bolt

23 ± 2

Coupling Nut Between Exhaust Manifold Assembly
and Precatalytic Converter Assembly

50 ± 5

Exhaust Manifold Assembly Fixing Nut

23 ± 2

Coupling Nut Between Precatalytic Converter Upper
Body Assembly and Precatalytic Converter Lower
Body Assembly

50 ± 5

Left Coupling Bolt Between Precatalytic Converter
Assembly Bracket and Cylinder Block

23 ± 2

Right Coupling Bolt Between Precatalytic Converter
Assembly Bracket and Cylinder Block

50 ± 5

Coupling Nut Between Precatalytic Converter Lower
Body Assembly and Main Catalytic Converter
Assembly

50 ± 5

Upstream Oxygen Sensor

40 - 60

Downstream Oxygen Sensor

40 - 60

Coupling Nut Between Main Catalytic Converter
Assembly and Center Pipe Assembly

50 ± 5

Coupling Spring Bolt Between Center Pipe Assembly
and Muffler Assembly

50 ± 5

Muffler Assembly Left Hanger Block III Assembly
Fixing Bolt

50 ± 5

Muffler Assembly Right Hanger Block III Assembly
Fixing Bolt

50 ± 5

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Tools

General Tools

Precision Ruler

Feeler Gauge

RCH0000063

RCH0000060

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DIAGNOSIS & TESTING

Problem Symptoms Table

HINT:
Use the table below to help determine the cause of problem symptoms. Check each suspected area in
sequence. Repair or replace the faulty components, or adjust as necessary.

Exhaust System Gas Leakage Inspection

Method to check gas leakage in exhaust system joints:
Warm up engine for a while, and check for gas leakage in the exhaust system joints. A certain amount of gas
leakage at the exhaust pipe joint is allowed, but gas leakage at the joint between exhaust manifold and
cylinder head is prohibited. The judging standard is that engine does not shudder and no "poof" sound can be
heard at the joints.

Symptom

Suspected Area

See page

Excessive exhaust noise

Exhaust pipe (loose connection)

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Precatalytic converter assembly (damaged
or leaked)

11-10

Main catalytic converter assembly
(damaged or leaked)

11-13

Center pipe assembly (damaged or leaked)

11-15

Muffler assembly (damaged or leaked)

11-17

Exhaust manifold assembly (broken or
leaked)

11-7

Excessive exhaust temperature

Precatalytic converter assembly (blocked)

11-10

Main catalytic converter assembly
(blocked)

11-13

Incorrect ignition timing in ignition system

-

Inadequate gas mixture combustion

-

Exhaust pipe leakage

Exhaust pipe gasket (damaged)

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Exhaust pipe (damaged)

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