Exhaust System: Description and Operation

SYSTEM

Exhaust System:

The exhaust system is a unique design. The system consists of two side mounted catalytic converters and resonators with a single, rear mounted muffler. The two downstream oxygen sensors are located between the resonators and the muffler.

EXHAUST MANIFOLDS

Exhaust manifolds are tubular stainless steel, one piece design with large runners. The lower section has a heated oxygen sensor on each side. For sealing a Multi-Layer Steel (MLS) gasket is used between the exhaust manifold and aluminum cylinder head.


EXHAUST MANIFOLD COUPLING

V-Band Clamp:

The exhaust manifold to catalytic converter connection is secured by a V-Band clamp. When the V-Band clamp is tightened, it forces the flared mating surfaces of the manifold and catalytic converter pipe together for sealing and support of the joint. The flexible section on the catalytic converter pipe absorbs, engine movement. The V-Band clamp must be replaced if removed.

CATALYTIC CONVERTER

There is no regularly scheduled maintenance on any Chrysler catalytic converter. If damaged, the exhaust system must be replaced.

CAUTION: Due to exterior physical similarities of some catalytic converters with pipe assemblies, extreme care should be taken with replacement parts.

HEAT SHIELDS

Exhaust System Heat Shields:

Exhaust Manifold Heat Shield:

Heat shields are needed to protect both the car and the environment from the high temperatures developed in the vicinity of the catalytic converters and exhaust manifolds. Additional thermal insulation is used in the sill panels and above the rear muffler.

CAUTION: Avoid application of rust prevention compounds or undercoating materials to exhaust system floor pan heat shields on cars if equipped. Light over spray near the edges is permitted. Application of coating will greatly reduce the efficiency of the heat shields resulting in excessive floor pan temperatures and objectionable fumes.

The combustion reaction caused by the catalyst releases additional heat in the exhaust system. Causing temperature increases in the area of the reactor under severe operating conditions, Such conditions can exist when the engine misfires or otherwise does not operate at peak efficiency. Do not remove spark plug wires from plugs or by any other means short out cylinders if exhaust system is equipped with catalytic converter. Failure of the catalytic converter can occur due to temperature increases caused by unburned fuel passing through the converter.
The use of the catalysts also involves some non-automotive problems. Unleaded gasoline must be used to avoid poisoning the catalyst core. Do not allow engine to operate above 1200 RPM in neutral for extended periods over 5 minutes. This condition may result in excessive exhaust system temperatures because of no air movement under the vehicle.