🔍 Key Concepts

• Fuel injector nozzle spray pattern and how it affects combustion in a diesel engine • Typical visible symptoms of poor combustion (incomplete burning of fuel) • Differences between combustion-related symptoms and cooling or load-related symptoms

💭 Think About

• Ask yourself: If fuel isn’t atomized and distributed correctly, what will happen inside the cylinder during combustion? • Which of these choices would you most likely be able to SEE or OBSERVE in the exhaust when combustion is not efficient? • Which options relate more to engine load or cooling system performance rather than to how fuel is burning?

✅ Before You Answer

• Identify which choice directly reflects incomplete or poor combustion rather than secondary effects like temperature or pressure changes • Consider which symptom would most likely appear outside the engine (visibly or obviously) when the spray pattern is distorted • Eliminate any answer that mainly refers to cooling system behavior instead of fuel combustion quality