Isuzu Trooper (1998-2002 year). Service manual — part 361
6F–3
ENGINE EXHAUST
For Isuzu General Motors (IGM)
150RW058
When inspecting or replacing exhaust system
components, make sure there is adequate clearance
from all points on the underbody to prevent overheating
the floor pan and possible damage to the passenger
compartment insulation and trim materials.
Check complete exhaust system and nearby body areas
and rear compartment 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 rear compartment or
passenger compartment. Dust or water in the rear
compartment may be an indication of a problem in one of
these areas. Any faulty areas should be corrected
immediately.
Hangers
Various types of hangers are used to support exhaust
system(s). These include conventional rubber straps,
rubber rings, and rubber blocks.
The installation of exhaust system supports is very
important, as improperly installed supports can cause
annoying vibrations which can be difficult to diagnose.
Three Way Catalytic Converter
The three way catalytic converter is an emission control
device added to the exhaust system to reduce pollutants
from the exhaust gas stream.
CAUTION: The catalytic converter requires the use
of unleaded fuel only.
Periodic maintenance of the exhaust system is not
required. If the vehicle is raised for other service, it is
advisable to check the condition of the complete exhaust
system.
A dual bed monolith catalytic converter is used in
combination with three way catalytic converter.
Catalytic Types:
Three way (Reduction/Oxidation) catalyst
The catalyst coating on the three way (reduction)
converter contains platinum and rhodium which lowers
the levels of nitrous oxide (NOx) as well as hydrocarbons
(HC) and carbon monoxide (Co).
Gasket
The gasket must be replaced whenever a new exhaust
pipe, muffler or catalytic converter is installed.
6F–4
ENGINE EXHAUST
Front Exhaust Pipe
Front Exhaust Pipe and Associated Parts
150RW063
Legend
(1) Front Exhaust Pipe RH Fixing Nuts
(2) Front Exhaust Pipe RH Fixing Bolts and Nuts
(3) O
2
Sensor Terminal Connector (for IGM)
(4) Front Exhaust Pipe LH Fixing Nuts
(5) Front Exhaust Pipe LH Fixing Bolts and Nuts
(6) Front Exhaust Pipe LH
(7) Front Exhaust Pipe RH
(8) Three way Exhaust Pipe Fixing Bolts and Nuts
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Disconnect O
2
sensor harness connector (3).
4. Remove front exhaust pipe fixing nuts and three way
Exhaust Pipe Fixing Bolts and Nuts (2)(5)(8).
5. Remove front exhaust pipe fixing three stud nuts from
exhaust manifold (1)(4).
6. Remove front exhaust pipe (6)(7).
Installation
1. Install front exhaust pipe (6)(7) and tighten three stud
nuts (1)(4) and nuts (2)(5)(8) to the specified torque.
Torque
Stud Nuts : 67 N·m (6.8 Kg·m/49 lb ft)
Nuts : 43 N·m (4.3 Kg·m/32 lb ft)
2. Reconnect O
2
sensor harness connector (3).
6F–5
ENGINE EXHAUST
Three Way Catalytic Converter
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Remove three way exhaust pipe fixing bolts and nuts.
150RW065
Installation
1. Install three way catalytic converter between three
way exhaust pipe and silencer.
2. Tighten nuts to the specified torque.
Torque
Nuts : 43 N·m (4.4 Kg·m/32 lb ft)
6F–6
ENGINE EXHAUST
Exhaust Silencer
Exhaust Silencer and Associated Parts
E06RW031
Legend
(1) Exhaust Silencer
(2) Exhaust Silencer
(3) Mounting Rubber
(4) Exhaust Silencer Fixing Nuts
(5) Exhaust Silencer Fixing Bolts
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Remove exhaust silencer fixing nuts (4) then
disconnect rear exhaust pipe from exhaust silencer.
4. Remove exhaust silencer fixing nuts (5) then
disconnect exhaust silencer from three way exhaust
pipe.
5. Remove exhaust silencer mounting nuts from
chassis side then remove exhaust silencer (1)(2).
Installation
1. Install the exhaust silencer (1)(2) chassis side and
tighten nuts to the specified torque.
Nuts: 16 N·m (1.6 Kg·m/12 lb ft)
2. Install the exhaust silencer and tighten nuts (5) on
front exhaust pipe to specified torque.
Nuts: 43 N·m (4.4 Kg·m/32 lb ft)
3. Install the rear exhaust pipe and tighten fixing nuts on
exhaust silencer to specified torque.
Nuts: 43 N·m (4.4 Kg·m/32 lb ft)
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