🔍 Key Concepts

• Review the basic diesel engine parts: piston, connecting rod, and crankshaft and how they line up in a cylinder. • In the illustration, follow the connecting rod upward to see what component it attaches to inside the cylinder liner. • Notice which numbered labels point to parts inside the cylinder bore (not on the outside, and not down on the crankshaft).

💭 Think About

• Which numbered label is pointing to the solid part that actually slides up and down inside the cylinder liner, directly attached to the small end of the connecting rod? • Which numbers are clearly pointing to other components, such as a valve mechanism, fuel injector, or crankshaft, that cannot be the piston? • If you trace the power flow from the combustion space to the crankshaft, which labeled part is the first moving part that receives the gas force from above?

✅ Before You Answer

• Verify that the label you choose is inside the cylinder and has a curved top surface facing the combustion chamber. • Confirm that the part you select is directly connected to the connecting rod, not to gears or valve train components. • Eliminate any labels that point to the crankshaft at the bottom or to valves/injectors at the top of the cylinder head before deciding.