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Chevrolet Silverado / GMC Sierra. Manual - part 1855
EXHAUST SYSTEM DESCRIPTION
The exhaust system carries exhaust gases, treated by the catalytic converter, through the muffler
and into a resonator, if applicable where exhaust noise is lessened.
In order to secure the exhaust muffler assembly to the exhaust manifold, a flange and seal-joint
coupling is utilized. The exhaust system may utilize a slip-joint coupling design with a clamp and
a U-bolt or a flange connection with a gasket.
Exhaust hangers and rubber insulators help to support the weight of the exhaust system along with
insulating any exhaust system vibration, rattle, or noise.
Exhaust hangers also space the exhaust system away from the underbody of the vehicle and allows
the exhaust system to expand as the exhaust system warms up.
Exhaust heat shields are used to protect the underbody and other components from damage due to
the heat from the exhaust system.
The exhaust system may be comprised of the following components:
Catalytic converter
Exhaust hanger
Exhaust heat shield
Exhaust insulator
Exhaust manifold
Exhaust muffler
Exhaust pipe
Exhaust resonator, if equipped
Exhaust tail pipe, if equipped
Catalytic Converter
The catalytic converter is an emission control device added to the engine exhaust system in order
to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants
from the exhaust gas.
The catalytic converter is comprised of a ceramic monolith substrate, supported in insulation and
IMPORTANT: Use of non-OEM parts may cause driveability concerns.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
housed within a sheet metal shell. The substrate may be washcoated with 3 noble metals:
Palladium (Pd)
Platinum (Pt)
Rhodium (Rh)
The catalyst in the converter is not serviceable.
Muffler
The exhaust muffler reduces the noise levels of the engine exhaust by the use of tuning tubes. The
tuning tubes create channels inside the exhaust muffler that lower the sound levels created by the
combustion of the engine.
Resonator
Some exhaust systems may be equipped with a resonator. The resonator, located either before or
after the muffler, allows the use of mufflers with less back pressure. Resonators are used when
vehicle characteristics require specific exhaust tuning.
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS
Illustration
Tool Number/ Description
J 35314-A/BT-8515/BT-8515A
Exhaust Back Pressure Tester
J 38185
Hose Clamp Pliers
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 ENGINE
Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application
Specification
Metric
English
Accessory Drive Belt Idler Pulley Bolt
50 N.m
37 lb ft
Accessory Drive Belt Tensioner Bolts
50 N.m
37 lb ft
Active Fuel Management Oil Pressure Relief Valve
27 N.m
20 lb ft
Air Conditioning Drive Belt Tensioner Bolts
50 N.m
37 lb ft
Automatic Transmission Flex Plate Bolts - First Pass
20 N.m
15 lb ft
Automatic Transmission Flex Plate Bolts - Second
Pass
50 N.m
37 lb ft
Automatic Transmission Flex Plate Bolts - Final
Pass
100 N.m
74 lb ft
Battery Cable Channel Bolt
12 N.m
106 lb in
Camshaft Position (CMP) Actuator Magnet Bolts
12 N.m
106 lb in
Camshaft Position (CMP) Actuator Solenoid Valve
- First Pass
65 N.m
48 lb ft
Camshaft Position (CMP) Actuator Solenoid Valve
- Final Pass
90 degrees
Camshaft Position (CMP) Sensor Bolt
12 N.m
106 lb in
Camshaft Position (CMP) Sensor Wire Harness Bolt
12 N.m
106 lb ft
Camshaft Retainer Bolts - Hex Head Bolts
25 N.m
18 lb ft
Camshaft Retainer Bolts - TORX Head Bolts
15 N.m
11 lb ft
Camshaft Sprocket Bolt - First Pass
75 N.m
55 lb ft
Camshaft Sprocket Bolt - Final Pass
50 degrees
Connecting Rod Bolts - First Pass
20 N.m
15 lb ft
Connecting Rod Bolts - Final Pass
85 degrees
Coolant Air Bleed Pipe and Cover Bolts
12 N.m
106 lb in
Coolant Temperature Sensor
20 N.m
15 lb ft
Crankshaft Balancer Bolt - Installation Pass - to
330 N.m
240 lb ft
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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