🔍 Key Concepts

• Piston design and heat transfer in marine diesel engines • Location and purpose of cooling fins on engine components • Difference between piston crown, piston skirt, and cylinder liner

💭 Think About

• Which part of the piston is exposed to the highest temperature and needs the most rapid heat dissipation? • Are cooling fins usually placed where they contact cooling water directly, or where they can increase surface area to air/oil for heat transfer? • Think about how the piston moves inside the liner—where could fins be placed without interfering with piston motion against the liner walls?

✅ Before You Answer

• Be clear on what is meant by piston crown (top surface in the combustion space) versus piston skirt (guiding surface lower down). • Consider whether cooling fins can realistically be placed inside the water jacket, given that the piston is a moving part and the jacket is stationary. • Visualize a cross-section of a trunk-type or crosshead-type piston and identify where extra surface area for cooling can be added without touching the cylinder walls.