🔍 Key Concepts

• heat transfer from the nozzle to the cylinder head in small high-speed diesel engines • the effect of carbon deposits on nozzle tip temperature • the importance of following builder’s specifications for fuel temperature and installation

💭 Think About

• Which choice directly improves the nozzle’s ability to get rid of excess heat into the surrounding metal? • How do hard carbon deposits on the nozzle tip affect both spray pattern and the nozzle’s ability to shed heat? • Is controlling fuel temperature alone enough to protect the metal of the nozzle tip from local overheating?

✅ Before You Answer

• Identify which option most directly improves cooling of the nozzle tip by conduction into the cylinder head or surrounding structure • Consider whether carbon deposits act as an insulator between the hot nozzle metal and cooler surroundings • Verify from diesel engine theory how nozzle seating, fit, and cleanliness affect both heat dissipation and nozzle life