PEP 11 - Exhaust

Exhaust

E P RODUCT MPHASIS ROGRAM

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Inspecting Exhaust Systems Technical Information

The most common sign of exhaust system failure is increasing noise from the system. This is an indication that the muffler may be starting to wear out, but it may not be the only cause of excessive exhaust noise. The vehicle may not have the proper muffler installed, low restriction mufflers may be cheap but they can generate excessive noise. Always start an inspection at the engine and work your way to the muffler. Carefully look at all of the piping, connections, seams and elbows for any indication of a leak. The first tell tale sign of an exhaust leak is black streaks or soot on the outside of the pipe. Caution: Road contaminants and oil can mask defective areas. Excessively dirty exhaust system may require the engine to be started to listen carefully at joints and welds for leaks. If a suspect area is found, a screwdriver or other pointed object should be used to poke around the area. Usually the metal will be soft and thin at the defective area. By probing, you may penetrate the pipe easily. Areas more prone to failures, outside radius of an elbow or bend in a pipe, the metal is stretched in these areas and is thinner. Welds can and do crack, so be certain to check these as well. Muffler seams are prone to corrosion, which can be a source of leaks as well. Corrosion can take place inside the exhaust system it is caused by a mixture of exhaust sulfur and moisture. Inspect for missing or broken clamps. Vibration is major cause of exhaust system failure. It can virtually break the tubing or connection. Inspect the system the proper support hangers and brackets.

Walker Exhaust Components

Dayton Parts, Inc.

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