🔍 Key Concepts

• Cylinder liner wear patterns in single-acting diesel engines (where along the stroke wear is usually greatest) • Relationship between liner wear and piston ring/groove wear (what happens when clearances increase) • Operating conditions at top dead center (TDC) vs middle and bottom of stroke (temperature, pressure, combustion effects)

💭 Think About

• Think about where in the cylinder the temperature, pressure, and gas velocity are highest during combustion. Would that area wear more or less than the rest? • If the liner becomes worn and clearances between liner and rings increase, what does that do to how the rings move and how they contact the ring grooves? • In a real engine under load, would you expect exactly equal wear from top to bottom of the liner, or a specific zone of higher wear?

✅ Before You Answer

• Check which option correctly links excessive liner wear to changes in piston ring and groove wear. • Verify which statements claim that wear is uniform or equal along the liner, and ask if that matches real combustion and loading conditions. • Eliminate any choice that contradicts typical maximum wear occurring near the top ring travel / top of the stroke, where combustion forces are greatest.