🔍 Key Concepts

• Relationship between engine load and cooling water temperature in a diesel engine • What happens to exhaust gas temperature and heat rejection to cooling water when cylinders are overloaded or underfueled • Difference between combustion problems (incomplete combustion, blow‑by, insufficient fuel) versus conditions that affect all cylinders equally

💭 Think About

• Ask yourself: which condition listed would most likely raise the heat produced in every cylinder, causing more heat to be carried away by the cooling water? • Consider what would have to change in the engine’s operation for every outlet thermometer to show a similar rise at the same time. • Which options describe faults that are usually individual‑cylinder issues, and which describe a global engine operating condition?

✅ Before You Answer

• Verify which condition would increase overall engine power demand and heat load rather than reduce it. • Check which faults (incomplete combustion, blow‑by, insufficient fuel) tend to cause loss of power and cooler operation, not hotter cooling water, in all cylinders. • Confirm that the best choice should logically affect all cylinders simultaneously, matching the symptom: all outlet temperatures rising together.