Engine work involves repairing or maintaining a car's engine. This can include tasks like fixing engine components, diagnosing and resolving issues, or performing routine maintenance. Mechanics may conduct tasks such as changing spark plugs, belts, and hoses, repairing or replacing parts like the alternator or water pump, and diagnosing and addressing problems like engine misfires or overheating. Essentially, engine work ensures that the car's engine operates correctly and efficiently, allowing the vehicle to run smoothly and reliably.