This manual covers the Mercury MerCruiser Number 36 ECM 555 Diagnostics, a marine engine diagnostic and service manual designed for the repair, maintenance, rebuild, refurbish, or restoration of Mercury MerCruiser marine engines equipped with ECM 555 diagnostics. It provides comprehensive information to ensure the optimal performance and longevity of your marine propulsion system. This official service repair manual, written in English, offers detailed tear-down and rebuild procedures, complete with pictures, part diagrams, torque specifications, and troubleshooting guides. It includes step-by-step instructions, detailed illustrations, diagrams, and wiring schematics for ECMs with 10-pin and 14-pin harnesses. This manual is an essential resource for both do-it-yourselfers and experienced mechanics seeking to maintain and repair their Mercury MerCruiser engines.