This Service Repair Manual covers Mercury MerCruiser GM V8 engines, including various models such as MCM 5.0L, MCM 5.0LX, MCM 5.7L, MCM 350/454/502 MAGNUM, MCM 7.4L, MIE 5.7L, MIE 7.4L, MIE 8.2L, and MIE 5.7L/MIE 350 MAGNUM - COMPETITION SKI. These engines are known for their robust engineering and reliable performance in marine applications. The manual provides comprehensive information for maintaining and repairing these powerful V8 powerplants. The purpose of this manual is to provide detailed guidance for the maintenance, troubleshooting, removal, and installation of various engine and system components. It covers critical areas including engine mechanical systems, fuel delivery systems (including carburetors), electrical systems (starting, ignition, charging, instrumentation, and wiring diagrams), cooling systems (seawater and closed-cooled), exhaust systems, drivetrain components, and power steering. With step-by-step written instructions and detailed illustrations, this manual is an essential resource for owners, mechanics, and technicians.