🔍 Key Concepts

• Effect of low cylinder temperature in diesel engines • How incomplete combustion shows up inside cylinders and exhaust system • Difference between pressure-related problems and deposit-related problems

💭 Think About

• When a diesel runs at very light load, are cylinder temperatures generally higher or lower than normal? How does that affect how completely fuel burns? • Which of the listed problems would most likely be associated with unburned or partially burned fuel inside the cylinders and exhaust passages? • Which choices sound more like problems from very hard loading (high temperature/pressure) instead of very light loading (cool operation)?

✅ Before You Answer

• Identify which option is most directly caused by cool cylinders and incomplete combustion over time. • Eliminate any choices that are more typical of overloading or high-temperature operation. • Ask: which condition would gradually build up inside the engine rather than showing up suddenly as a failure?