A Diesel Engine Technician - Leave Reliever's job is to temporarily cover for a full-time diesel technician, performing tasks like inspecting, diagnosing, and repairing heavy vehicles and machinery. This includes maintenance, troubleshooting engine issues, replacing faulty components, and maintaining vehicle records, often using specialized diagnostic tools. The role requires a strong understanding of diesel engine systems, the ability to interpret technical manuals, and a commitment to safety protocols.