Exhaust system check

Exhaust system check

When your truck’s exhaust system is running well, the truck is quieter, exhaust emissions are low, and the back pressure within the system is balanced. You don’t want the muffler to put enough baffles in the exhaust flow so that it shuts down the sound, because it would also shut down the flow. If the flow becomes too high, the sound increases as well. Let the back pressure go too high, and the engine will stall because the fuel/air mixture is bottled up in the combustion chamber.

Make sure your exhaust system is operating at peak performance by following these tips from Kenworth:

Noisy exhaust system:
• Flex tubing is the first place to look for noise leaks –– inexpensive tubing is usually the first spot to fail. Flex tubing should always be installed in a half-extended state. Fully-extended flex tubing will cause premature failure. Never use flex tubing to form an exhaust pipe bend; use elbows instead. If you are considering trying to repair flexible tubing, be aware that patching doesn’t do the job; it just doesn’t last. It’s best to replace the entire section.

• Make sure that the hangers supporting the exhaust system are not too loose and not too tight, or they will cause noise.

• A resonator can be installed to cancel out “bad” sound.

• Installing a dual muffler/”Y” connector system can reduce noise. The “Y” connector is installed so that two pipes run out of the original one. They each lead to a muffler. The result is that each pipe’s noise is reduced by more than half.
Around the muffler: Inspect the area around clamps for cracks and rust-through. Noise and soot can escape from these places. Escaping exhaust gases can lead to the truck driver being poisoned by carbon monoxide.

Check elbows, stacks and exhaust pipes. Dented or crushed tubing restricts exhaust flow and increases back pressure. Even small dents will reduce fuel economy and increase turbocharger wear. Large dents drastically reduce fuel economy by increasing bearing and lower cylinder wear. They will also raise exhaust temperatures.

Don’t have a rain cap on your stack pipe? Consider getting one. While mufflers will prevent rain, melted snow, and sleet from going through the muffler back to the engine, a rain cap will prevent a slurry of soot from being blown onto the trailer. Clamps should be checked for cracking. Clamps also should not be reused –– like other bolted components, they can stretch and weaken over time.

You May Also Like

Carrier hybrid unit offers reduced weight, improved fuel economy

Advantages of Carrier Transicold’s new Vector 8500 single-temperature hybrid trailer refrigeration unit include less weight, better capacity and improved fuel efficiency, according to the company.

Advantages of Carrier Transicold’s new Vector 8500 single-temperature hybrid trailer refrigeration unit include less weight, better capacity and improved fuel efficiency, according to the company. With the Vector 8500, Carrier is also introducing a fully hermetic electric scroll compressor, used in refrigerated marine container systems, that has 70 percent fewer moving parts and is 200 lbs lighter than a traditional reciprocating compressor.
The Carrier Transicold Vector 8500 incorporates the manufacturer’s ecoFORWARD technologies. Compared to the unit it succeeds, the new Vector 8500:

Digital Abex air disc brake catalog now available

A new digital catalog featuring the expanded Abex line of replacement air disc brake pads for commercial vehicles is now available from Federal-Mogul.

Peterbilt showcases advanced technologies

During the annual Energy Summit and Fair held on the campus of the University of North Texas (UNT), home of the PACCAR Technology Institute, Peterbilt Motors Co. displayed the SuperTruck advanced concept vehicle it is developing with Cummins Inc. through a U.S. Department of Energy program.

PIT compares 6×2 and 6×4 tractors

Evaluations comparing 6×2 and 6×4 trucks by FPInnovations’ Performance Innovation Transport (PIT) group showed that 6×2 tractors consume less fuel than similar 6×4 tractors.

Thermo King integrates TracKing Telematics Solution with Add On Systems

The TracKing web-based, refrigerated trailer and temperature monitoring system from Thermo King can now be integrated with AS400/iSeries software for the truckload carrier market from Add On Systems (AOS) Inc.

Other Posts

Eight tips to prepare your trucks for winter

Like it or not, winter is coming. You know the drill: falling temperatures, snow, and ice hitting large swaths of North America, presenting challenges for trucks and fleets. Now is the time to prepare. With harsh weather looming, this installment of the Bendix Tech Tips Series serves up eight pieces of advice for wheel-ends, air

Tech Tip: How often is lift maintenance needed?

Even the most rugged, low-maintenance lifts need attention from time to time. Related Articles – Dobbs Peterbilt given award by Montgomery Transportation Group – Battling spring’s unwanted guests: keeping mice out of trucks – Schaeffler, ATSG partner to support technical education Give your lift a once-over every day before you use it, check the safety

Tech Tip: Be your own cable guy

When was the last time you checked the cables on your shop’s lifts? If you answered “today,” good for you! Cables are one of the things you should check before using your lift every day. In this article, we’ll explore how to maintain your lift cables or “wire ropes,” how to look for damage, and

Tech Tip: Troubleshooting your two-post lift

Your lift is critical to the operation and profitability of your business. If it stops working correctly, it’s costing you money. Let’s take a look at how to troubleshoot some common issues and get your lift back to work. Remember to check your owner’s manual for details about your specific lift. Related Articles – Dobbs