🔍 Key Concepts

• Heat balance in a diesel engine (how heat is removed vs. produced) • Role of the cooling water system vs. fuel and air systems • What happens at a steady load when a parameter changes

💭 Think About

• Ask yourself: At a steady load, which system change would most directly reduce the engine’s ability to get rid of heat, without changing how much heat is produced? • Which option would very quickly show up as a temperature rise on the jacket water/outlet temperature gauges? • Which of these conditions is most commonly checked first by engineers when engine temperature climbs but power output hasn’t increased?

✅ Before You Answer

• Verify which choice directly affects cooling capacity rather than heat production • Consider what a blocked air intake usually affects first (power, smoke, RPM, or temperature?) • Recall normal order of checks: cooling water flow, then fuel/air, then lube oil issues for an overheating symptom at constant load