🔍 Key Concepts

• Basic diesel engine construction – how the cylinder, piston, and crankcase are arranged • What the piston does in the cylinder during the stroke cycle • Difference between cylinder liner, crankcase, and crank cheek in location and function

💭 Think About

• Picture a side-view of a diesel engine: what actually moves back and forth inside the cylinder bore? • Which part is located directly at the opposite end of the cylinder head and forms the moving ‘wall’ that compresses the air-fuel mixture? • Which of the options is an outer housing or support structure rather than the part that directly closes the open end of the cylinder?

✅ Before You Answer

• Verify which part reciprocates inside the cylinder bore. • Verify which part is mainly a housing for the crankshaft and lubricating oil, not the sealing end of the cylinder. • Confirm that a cylinder liner is a wear surface inside the cylinder, not the moving or fixed end that closes it.