How to troubleshoot Exhaust Systems


1. Mufflers. – Inspect area around clamps for breakage, cracks and rust-through Leakage here causes:

• Excess noise because exhaust noise escapes before being silenced by muffler.
• Cleanup expense as soot escapes to discolour cab or trailer.
• Operator problems as exhaust gases may escape to driver compartment causing sleepiness and even death through carbon monoxide poisoning.

2. Elbows, Stacks and Exhaust Pipes. Dents or crushed portions of any tubing creates exhaust flow restriction and increases back pressure significantly. Even relatively small dents will cause decreased fuel economy and increased turbo wear. If dents are relatively large, increased bearing and lower cylinder wear will occur due to increased exhaust temperature. In such cases, significant decreases in fuel economy will result.

3. Rain Caps. Although Spareco Exhaust mufflers are designed to prevent rain, melted snow and sleet from passing beyond the muffler to the engine, rain caps are recommended. Water entering the muffler will create a slurry of soot to be blown on the trailer causing significant clean up expense. A curved exhaust stack is an acceptable alter native to a rain cap but may not be 100% effective in hard rains.

4. Clamps. Check band clamps for cracking periodicaly. Reuse of any clamp is not recommended.

5. Flexible Tubing. Do not patch. Replace entire section. Stainless steel is recommended as best value.

6. Mounting. The exhaust system should be secured to eliminate vibration. The muffler brackets should fast securely to the muffler and to the mast or truck frame (horizontal). The muffler brackets should not squeeze the muffler body and the mast must not vibrate or wiggle.

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