🔍 Key Concepts

• diesel combustion at light load and how fuel burns when cylinder temperature/pressure are marginal • effect of cylinder cooling on combustion temperature and ignition quality • difference between lube oil temperature issues and combustion-related problems like misfiring

💭 Think About

• Ask yourself: for a cylinder at light load, is cylinder temperature generally higher or lower, and what does that do to fuel ignition? • Which of these choices would tend to LOWER the temperature in the combustion space so much that fuel may not ignite properly every cycle? • Which options mainly affect bearing/viscosity issues vs. actually affecting whether injected fuel will ignite?

✅ Before You Answer

• Be clear on what misfiring means (fuel not igniting or burning properly) rather than mechanical wear or friction problems • Identify which option would most directly reduce combustion temperature at light loads • Eliminate any options that mostly affect lubrication performance rather than in-cylinder ignition conditions