🔍 Key Concepts

• Diesel engine cooling systems and how heat is removed from the cylinder head • The effect of restricted cooling water passages on metal temperature and stress • Where most heat is concentrated: intake vs exhaust side of the head

💭 Think About

• Which of these options would cause the cylinder head metal to run hotter overall, not just a single part? • How would scale or deposits inside cooling passages affect the flow of cooling water and the head’s ability to get rid of heat? • Which parts normally run hottest in a diesel and rely heavily on good cooling to prevent warping or cracking?

✅ Before You Answer

• Verify which choice directly reduces cooling efficiency of the cylinder head as a whole • Check which option would likely lead to localized overheating and thermal stress in the metal • Eliminate any options that mainly affect lubrication or ring sealing rather than cylinder head temperature