Exhaust system servicing — general information

Warning: Allow exhaust system components to cool before inspection or repair. Also, when working under the vehicle, make sure it is securely supported on jack stands.

1. The exhaust system consists of the exhaust manifolds, catalytic converter, muffler, tailpipe and all connecting pipes, flanges and clamps. The exhaust system is isolated from the vehicle body and from chassis components by a series of rubber hangers (see illustration). Periodically inspect these hangers for cracks or other signs of deterioration, replacing them as necessary.

6.1 Typical exhaust system hangers. Inspect regularly and replace at the first sign of damage or deterioration

Chevrolet Silverado Fuel and exhaust systems _ Typical exhaust system hangers. Inspect regularly and replace at the first sign of damage or deterioration

2. Conduct regular inspections of the exhaust system to keep it safe and quiet. Look for any damaged or bent parts, open seams, holes, loose connections, excessive corrosion or other defects which could allow exhaust fumes to enter the vehicle. Do not repair deteriorated exhaust system components; replace them with new parts.

3. If the exhaust system components are extremely corroded, or rusted together, a cutting torch is the most convenient tool for removal. Consult a properly-equipped repair shop. If a cutting torch is not available, you can use a hacksaw, or if you have compressed air, there are special pneumatic cutting chisels that can also be used. Wear safety goggles to protect your eyes from metal chips and wear work gloves to protect your hands.

4. Here are some simple guidelines to fool- low when repairing the exhaust system:

a) Work from the back to the front when removing exhaust system components.

b) Apply penetrating oil to the exhaust system component fasteners to make them easier to remove.

c) Use new nuts, gaskets, hangers and clamps.

d) Apply anti-seize compound to the threads of all exhaust system fasteners during reassembly.

e) Be sure to allow sufficient clearance between newly installed parts and all points on the underbody to avoid overheating the floor pan and possibly damaging the interior carpet and insulation. Pay particularly close attention to the catalytic converter and heat shield.

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