🔍 Key Concepts

• Exhaust valve function and what happens when its sealing surface is damaged or burned • How a single-cylinder problem shows up differently than an overall engine problem • Typical engine parameters that change when combustion gases leak past a valve

💭 Think About

• If an exhaust valve is burned, what is happening to the hot combustion gases at that valve seat, and where would that extra heat show up first? • Which measurement would most clearly isolate a problem to one particular cylinder, rather than indicating a general engine condition? • Which of these choices is most directly related to the flow and temperature of gases leaving the cylinder after combustion?

✅ Before You Answer

• Identify which option refers specifically to exhaust conditions from one cylinder, not the whole engine • Ask which parameter would increase locally because hot gases are escaping where they should not • Eliminate any choices that mainly indicate in-cylinder pressure changes rather than heat in the exhaust path