🔍 Key Concepts

• Two-stroke diesel engine scavenging and exhaust flow path • Location of exhaust ports versus scavenge (intake) ports in a cylinder liner • Direction of gas flow from cylinder to turbocharger or exhaust manifold

💭 Think About

• Look at the cylinder area just above the piston at the end of the power stroke: which openings would allow burned gases to leave the cylinder? • Trace where each labeled feature (B, Q, T, U) connects: which one leads toward the turbocharger/exhaust receiver rather than to the crankcase or intake air box? • Compare the height and shape of the ports around the liner—are the exhaust ports usually higher or lower than the scavenge ports in a two-stroke design?

✅ Before You Answer

• Confirm which label is next to the passage that clearly leads to the exhaust manifold or turbocharger housing at the top/side of the engine • Make sure you are not choosing a feature that is part of the scavenge air box or intake system • Verify that the ports you select are cut into the cylinder liner wall and open directly to the path the exhaust gases follow out of the cylinder