Exhaust System: Description and Operation

EXHAUST SYSTEM DESCRIPTION
When inspecting or replacing the exhaust system components, make sure that there is adequate clearance from all points on the underbody. Adequate clearance prevents overheating of the floor pan and possible damage to the passenger compartment insulation and the trim materials.
Check the complete exhaust system, nearby body areas, and the rear compartment lid for the following conditions which could permit exhaust fumes to seep into the rear compartment or the passenger compartment:
^ Broken or damaged parts
^ Missing or misaligned parts
^ Open seams
^ Holes
^ Loose connections
^ Other deterioration
Dust or water in the rear compartment may be an indication of a problem in one of these areas. Correct faulty areas immediately. For continued integrity, the exhaust pipe rearward of the exhaust muffler must be replaced whenever a new exhaust muffler is installed.

EXHAUST MUFFLER
On single exhaust systems for the L82 and L36 engines, the entire exhaust system is serviced with one pre-welded part.
The single exhaust system is comprised of the following parts:
^ Resonator
^ Exhaust pipe
^ Exhaust muffler
^ Exhaust tail pipe
On the dual exhaust systems for the L36 and L67 engines, the exhaust system is serviced as five different components which can be clamped together:
^ Exhaust pipe, including the resonator
^ Right-hand muffler
^ Left-hand muffler
^ Right-hand tail pipe
^ Left-hand tail pipe
Always replace the catalytic converter gasket at the flanged joint between the exhaust system and the three-way catalytic converter when any service procedure necessitates disrupting this flanged joint. Never reinstall the original catalytic converter gasket.

HANGERS
Various types of hangers are used to support the exhaust system:
^ Exhaust pipe hangers
^ Exhaust hanger brackets
^ Exhaust hanger insulators
The installation of the exhaust system supports is very important. Improperly installed supports cause annoying vibrations.

CLAMPS
Two types of clamps are used for connecting exhaust system slip joints:
^ Saddle/U-bolt
^ Single Nut Compression
Coat the slip joints with exhaust system sealer before assembling.

WELDED CONNECTIONS
When servicing a welded connection, clamp the new connection. When installing replacement parts, coat the slip joints with exhaust system sealer before assembling.

THREE-WAY CATALYTIC CONVERTER

IMPORTANT: The three-way catalytic converter requires the use of unleaded fuel only.

The three-way catalytic converter is an emission control device that is added to the exhaust system to reduce pollutants from the exhaust gas stream.
Always replace the exhaust manifold pipe gasket and the catalytic converter gasket when a service procedure requires disrupting the flanged joints.
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.