🔍 Key Concepts

• Differences between dry and wet cylinder liners (location of cooling water and sealing rings) • What a ported jacket liner looks like (air or gas ports in the liner wall) • What an integral jacket means in terms of the liner being separate or part of the block

💭 Think About

• Look closely at the cross‑section: does the cooling water touch the outside of the liner itself, or is the liner surrounded by solid metal from the cylinder block? • Do you see any air or gas ports cut through the liner wall, like you would in a two‑stroke scavenged engine? • Is the liner shown as a clearly removable sleeve, or does the water jacket appear to be cast as one piece with the cylinder?

✅ Before You Answer

• Identify whether there is a water space directly against the liner or only in the surrounding block • Confirm if there are ports in the liner wall that would be used for scavenging or charging • Decide if the liner is separate from the cooling jacket or cast as one integral unit with it