Proper seal of the exhaust manifold is important why?

• A. Fire hazard, CO poisoning and other toxic gases.
• B. To improve fuel efficiency.
• C. To reduce noise.
• D. To increase exhaust flow rate

Answer: (A)

A proper exhaust manifold seal is critical for safety because it prevents leaks of hot exhaust gases that can ignite flammable materials and release toxic fumes. When the seal isn’t tight, carbon monoxide and other combustion products can seep into the cockpit, cabin, or engine compartment, posing a serious poisoning risk to crew and passengers and a potential fire hazard near hot surfaces. Maintaining a good seal also helps keep the exhaust path correct and reduces heat damage to surrounding components. While leaks can affect performance in some ways, the immediate and vital concern is preventing fire and toxic gas exposure, which is why this is the best reason for ensuring a proper seal.