Opposed Engine Exhaust System Components

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What are the risers in a typical engine exhaust system attached to each cylinder with?

Brass or special lock-nuts

What purpose does the crossover tube serve in some exhaust systems?

Connects the exhaust stacks on the left side with the stacks on the right side

How are sections of the exhaust system usually joined together?

With spring-loaded ball joints

Why are slip joints used in radial engine exhaust manifolds?

To compensate for expansion when the engine is running Signup and view all the answers

Where is each section of the collector bolted in a radial engine exhaust system?

To a bracket on the blower section of the engine Signup and view all the answers

What are the exhaust collector tubes in a typical system routed to?

Turbocharger, muffler, exhaust augmentor, or overboard Signup and view all the answers

How does the telescoping expansion joint help in the removal of segments of the collector ring?

By allowing enough slack without removing the tailpipe Signup and view all the answers

What is the purpose of using a tapered opening (bayonet) in exhaust collectors?

To reduce noise levels by creating a slightly low pressure Signup and view all the answers

What role do mufflers play in reducing engine noise?

Mufflers pass exhaust through baffles to break up sound energy Signup and view all the answers

How do propellers and exhaust contribute to noise in aviation engines?

Propellers produce a large portion of noise, while exhaust also accounts for some noise Signup and view all the answers

What is the function of a stainless steel shroud or shell placed around a muffler?

It acts as a heat exchanger Signup and view all the answers

How have mufflers evolved over the last forty years in terms of reducing engine noise?

Mufflers have become similar to those used on automobiles to reduce noise to a tolerable level Signup and view all the answers

What type of materials should be used to mark exhaust components?

Felt-tip markers, India ink, or Prussian blue Signup and view all the answers

How should exhaust system components with a ceramic coating be cleaned?

Using a degreasing solution Signup and view all the answers

Why should sand blasting or alkaline cleaners not be used on certain exhaust system components?

They remove the ceramic coating Signup and view all the answers

What is the risk of using used sand for blast cleaning on certain materials?

Metal particles from the used sand can become embedded in the metal and allow corrosion to form Signup and view all the answers

What should be used to probe suspected areas for cracks during exhaust system inspection?

An ice pick or similar pointed instrument Signup and view all the answers

What is the most common problem found in an exhaust system?

Cracks Signup and view all the answers

Why should augmentor tubes be inspected regularly?

For proper alignment, security of attachment, and general overall condition. Signup and view all the answers

What are the consequences of exhaust system failure?

Carbon monoxide poisoning, partial or complete loss of engine power, and/or an aircraft fire. Signup and view all the answers

Why should galvanized or zinc plated tools not be used on the exhaust system?

Because the metal of the exhaust system can absorb the lead, zinc, or galvanized mark when heated, causing cracks and eventual failure. Signup and view all the answers

What is the danger of carbon monoxide in the context of exhaust systems?

It displaces oxygen in the human body, leading to incapacitation and death at higher exposure levels. Signup and view all the answers

Why is it important to inspect exhaust systems despite being made of corrosion-resistant steel?

Because the systems operate at high temperatures and can fail, leading to severe consequences. Signup and view all the answers

What should be avoided when marking exhaust system parts?

Marking with a lead pencil. Signup and view all the answers

What are the probable contributing factors to engine backfiring and combustion of unburned fuel within the exhaust system?

Uneven exhaust gas flow and local hot spot areas. Signup and view all the answers

What extra precautions should be taken in exhaust system care and maintenance when a turbocharger is included?

Extra precautions should be taken due to the increased pressure and temperature conditions. Signup and view all the answers

What happens to the exhaust system pressure during high altitude operation?

The exhaust system pressure is maintained at or near sea level values. Signup and view all the answers

What can excessive deposit buildup in the waste gate unit cause?

Erratic system operation due to the waste gate sticking in the 'closed' position. Signup and view all the answers

What effect does coke deposit buildup in the turbo itself have on the aircraft's performance?

Gradual loss of power in flight and a low manifold pressure reading prior to takeoff. Signup and view all the answers

What is generally recommended when it comes to repairing exhaust system components like exhaust stacks, mufflers, and tailpipes?

It is generally recommended to replace them with new or reconditioned components rather than repairing them in the field. Signup and view all the answers