🔍 Key Concepts

• Piston components in a marine diesel engine • Where combustion pressure is applied on the piston • Difference between upper, lower, and side portions of a piston

💭 Think About

• Think about which part of the piston is directly exposed to the hot gases in the cylinder during combustion. • Consider which terms usually describe the side area of the piston that guides it in the cylinder versus the very top surface. • Ask yourself: in diagrams of pistons you’ve seen, what is the name given to the top face that actually receives the force of expanding gases?

✅ Before You Answer

• Verify which term refers to the top working surface of the piston. • Confirm which term is usually used for the side portion that runs in the cylinder liner. • Eliminate any option that normally refers to an area below or around the piston rather than the very top.