The Mercury Mercruiser 33 PCM555 marine engine, produced in 2001, represents a robust and reliable option for marine applications. Engineered for performance and durability, this model features a closed cooling system and multi-port fuel injection for efficient operation. Its design emphasizes quality construction, ensuring consistent power delivery and longevity for demanding marine environments. This engine is built to provide a dependable boating experience, reflecting Mercury Mercruiser's commitment to engineering excellence. This Workshop Service Repair Manual provides comprehensive guidance for the Mercury Mercruiser 33 PCM555 marine engine, covering serial numbers SN0M000000 and above. The manual details essential maintenance procedures, including lubrication, fluid requirements, and scheduled servicing. It also offers in-depth troubleshooting and diagnostic information, utilizing Mercruiser diagnostic software and hardware. This resource is designed to assist owners, technicians, and mechanics in maintaining the optimal performance and longevity of their marine engine.