30 Questions
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
Where is each section of the collector bolted in a radial engine exhaust system?
To a bracket on the blower section of the engine
What are the exhaust collector tubes in a typical system routed to?
Turbocharger, muffler, exhaust augmentor, or overboard
How does the telescoping expansion joint help in the removal of segments of the collector ring?
By allowing enough slack without removing the tailpipe
What is the purpose of using a tapered opening (bayonet) in exhaust collectors?
To reduce noise levels by creating a slightly low pressure
What role do mufflers play in reducing engine noise?
Mufflers pass exhaust through baffles to break up sound energy
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
What is the function of a stainless steel shroud or shell placed around a muffler?
It acts as a heat exchanger
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
What type of materials should be used to mark exhaust components?
Felt-tip markers, India ink, or Prussian blue
How should exhaust system components with a ceramic coating be cleaned?
Using a degreasing solution
Why should sand blasting or alkaline cleaners not be used on certain exhaust system components?
They remove the ceramic coating
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
What should be used to probe suspected areas for cracks during exhaust system inspection?
An ice pick or similar pointed instrument
What is the most common problem found in an exhaust system?
Cracks
Why should augmentor tubes be inspected regularly?
For proper alignment, security of attachment, and general overall condition.
What are the consequences of exhaust system failure?
Carbon monoxide poisoning, partial or complete loss of engine power, and/or an aircraft fire.
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.
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.
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.
What should be avoided when marking exhaust system parts?
Marking with a lead pencil.
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.
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.
What happens to the exhaust system pressure during high altitude operation?
The exhaust system pressure is maintained at or near sea level values.
What can excessive deposit buildup in the waste gate unit cause?
Erratic system operation due to the waste gate sticking in the 'closed' position.
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.
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.
Learn about the key components of an opposed engine exhaust system, including risers, exhaust collectors, lock-nuts, and crossover tubes. Understand the importance of proper installation and the use of spring-loaded ball joints.
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