The Mercury Mercruiser 502 CID engine, produced between 1993 and 1997, represents a robust V8 marine powerplant known for its significant power output, typically ranging from 300 to 400 horsepower, and substantial torque. With a displacement of 502 cubic inches, a bore of 4.46 inches, and a stroke of 4.00 inches, this engine is engineered for demanding marine applications. It features electronic ignition and can be configured with either a raw water or closed cooling system. The engine's design prioritizes reliability and performance, making it a capable choice for various boating needs. This Full Service Repair Manual in English provides comprehensive guidance for the Mercury Mercruiser 502 CID engine. It covers essential maintenance procedures, including recommended intervals for oil changes (annually or every 100 hours), fuel filter replacement, and impeller replacement, along with specifications for oil capacity and spark plug gap. The manual also details technical specifications for the engine and its associated transmission systems, offering valuable information for owners, mechanics, and technicians to ensure optimal performance, longevity, and proper repair of the vehicle.