Exhaust System

Inspect exhaust inlet pipes (5246) and mufflers (5230) for cracked joints, broken welds and corrosion damage that would result in a leaking exhaust system. Inspect the muffler pipe brackets (5277) and exhaust outlet pipe frame brackets (5260) for cracks and stripped or badly corroded bolt threads. When muffler pipe brackets are loosened and/or removed to replace a heat shield, exhaust inlet pipe or muffler, replace the muffler pipe brackets if there is reasonable doubt that their service life is limited.

NOTE: Mufflers are designed with drain holes. However, it is normal for a certain amount of moisture and staining to be present around the seams of the muffler. The presence of soot, surface rust, or moisture does not indicate a damaged muffler and should not constitute the basis for replacement.

Muffler clamps can be broken due to overtightening. When attempting to eliminate exhaust leaks at joints, tighten muffler clamp to specification. Do not overtighten bolts or nuts to correct a leak. If this does not eliminate the leak, the clamp should be loosened, rotated approximately one-quarter turn, and then retightened to specification.

The exhaust system, including heat shields, must be free of leaks, binding, grounding and excessive vibrations.

These conditions are usually caused by loose, broken or misaligned muffler pipe brackets, shields, exhaust outlet pipe frame brackets or other exhaust components. If any of these conditions exist, check the exhaust system components and their alignment. Align or replace as necessary.