🔍 Key Concepts

• Differences between wet liners and dry liners in diesel engines • How cooling water flows around or through cylinder liners • Meaning of integral water jacket versus fins used only for air cooling

💭 Think About

• Think about which liner designs are intended to be in direct contact with cooling water rather than just surrounded by metal • Ask yourself: do fins (internal or external) usually indicate air cooling or water passages? • Consider whether an integral water-jacket means the water flows through the liner itself or around a separate space in the block

✅ Before You Answer

• Identify which options are commonly associated with air-cooled engines • Decide which designs place cooling water in direct contact with the liner wall • Clarify in your mind whether water passages inside the liner are different from a water jacket formed in the engine block