This manual covers the Mercury MerCruiser GM V8 496 CID 8.1L Marine Engine, manufactured between 1998 and 2006. Designed for marine applications, this gasoline-powered engine is known for its robust engineering and reliability. The 496 cubic inch (8.1 liter) V8 configuration provides substantial power for various boating needs, reflecting Mercury MerCruiser's commitment to high-performance marine propulsion systems. The purpose of this repair manual is to provide comprehensive guidance for the service, maintenance, and repair of your Mercury MerCruiser marine engine. It includes detailed information on routine maintenance, engine removal and installation, fuel system, lubrication and cooling systems, intake and exhaust, electrical systems, and transmission drive chains. Furthermore, advanced troubleshooting procedures and technical specifications are thoroughly explained, ensuring that owners, mechanics, and technicians have the necessary resources to maintain optimal engine performance and longevity.