Opel Frontera UBS. Service manual — part 2375
6F–2
ENGINE EXHAUST
General Description
150R200025
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–3
ENGINE EXHAUST
Front Exhaust Pipe
Front Exhaust Pipe and Associated Parts
150R200005
Legend
(1) Gasket
(2) Front Exhaust Pipe RH Fixing Nuts
(3) O
2
Sensor Harness Connector
(4) Front Exhaust Pipe RH Fixing Bolts and Nuts
(5) Gasket
(6) Front Exhaust Pipe Fixing Bolts and Nuts
(7) Gasket
(8) O
2
Sensor Harness Connector
(9) Front Exhaust Pipe LH
(10) O
2
Sensor Harness Connector
(11) Front Exhaust Pipe LH Fixing Nuts
(12) O
2
Sensor Harness Connector
(13) Gasket
(14) Front Exhaust Pipe RH
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Disconnect O
2
sensor harness connector
(3)(8)(10)(12).
4. Remove front exhaust pipe fixing bolts and nuts
(4)(6).
5. Remove front exhaust pipe fixing three stud nuts (2)
(11) from exhaust manifold.
6. Remove front exhaust pipe (9)(14).
Installation
1. Install front exhaust pipe (9)(14) and tighten three
stud nuts (2)(11) and two nuts (4)(6) to the specified
torque.
Torque
Stud Nuts : 67 N·m (6.8 kg·m/49 lb ft)
Nuts(4) : 57 N·m (5.8 kg·m/42 lb ft)
Nuts(6) : 43 N·m (4.4 kg·m/32 lb ft)
2. Reconnect O
2
sensor harness connector
(3)(8)(10)(12).
6F–4
ENGINE EXHAUST
Three Way Catalytic Converter LH
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Disconnect front O
2
sensor harness connector and
rear O
2
sensor harness connector (3)(4).
4. Remove exhaust front pipe fixing three stud nuts (2)
from exhaust manifold side and two nuts (6)(7) from
rear end of exhaust front pipe (9).
150R200006
Legend
(1) Gasket
(2) Front Exhaust Pipe Fixing Three Stud Nuts
(3) O
2
Sensor Harness Connector
(4) O
2
Sensor Harness Connector
(5) Gasket
(6) Front Exhaust Pipe RH Fixing Bolts and Nuts
(7) Front Exhaust Pipe Fixing Bolts and Nuts
(8) Gasket
(9) Front Exhaust Pipe LH
Installation
1. Install exhaust front pipe (9) and tighten three studs
nuts (2) and two nuts (6)(7) to the specified torque.
Torque
Stud nuts : 67 N·m (6.8 kg·m/49 lb ft)
Nuts(6) : 57 N·m (5.8 kg·m/42 lb ft)
Nuts(7) : 43 N·m (4.4 kg·m/32 lb ft)
2. Reconnect O
2
sensor harness connector (3)(4).
6F–5
ENGINE EXHAUST
Three Way Catalytic Converter RH
Removal
1. Disconnect battery ground cable.
2. Raise the vehicle and support with suitable safety
stands.
3. Remove torsion bar. Refer to removal procedure in
Front Suspension section.
4. Disconnect front O
2
sensor harness connector (6)
and rear O
2
sensor harness connector (3).
5. Remove front exhaust pipe fixing bolts and nuts (4).
6. Remove three stud nuts (2) from exhaust manifold
then remove the exhaust front pipe (7).
150R200007
Legend
(1) Gasket
(2) Front Exhaust Pipe Fixing Three Stud Nuts
(3) O
2
Sensor Harness Connector
(4) Front Exhaust Pipe Fixing Bolts and Nuts
(5) Gasket
(6) O
2
Sensor Harness Connector
(7) Front Exhaust Pipe RH
Installation
1. Install front exhaust pipe (7) and tighten three stud
nuts (2) and two nuts (4) to the specified torque.
Torque
Stud nuts : 67 N·m (6.8 kg·m/49 lb ft)
Nuts : 57 N·m (5.8 kg·m/42 lb ft)
2. Install the torsion bar and readjust the vehicle height.
Refer to the installation and vehicle height adjustment
instructions in the Front Suspension Section.
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