🔍 Key Concepts

• Difference between dry liner and wet liner construction in diesel engines • How cooling water flows around a cylinder and what surfaces it actually touches • How to recognize when a cylinder is integral with the block versus a separate replaceable liner

💭 Think About

• Look closely at the outer surface of the cylinder liner (labeled I). Does it directly touch cooling water, or is there another metal wall between the liner and the water jacket? • Can you see any sealing features (like grooves or rings) near the top or bottom of the liner that would keep cooling water from leaking into the crankcase? What does that suggest about the liner type? • Does the sketch show the cylinder as one solid piece of metal with the block, or does it clearly show a separate sleeve fitted into the block?

✅ Before You Answer

• Identify whether coolant is in direct contact with the liner or separated by the block casting • Confirm if the liner is visibly separate from the cylinder block (showing two distinct pieces) or machined as one piece • Before choosing, mentally compare the drawing to your textbook definitions of dry liner, wet liner, and integral cylinders