🏷️ Basic Information Identification Make: Mercury Mercruiser Model: MCM 4.3L Series Engine Code: #25 Marine Engines Engine Base: GM V-6 Year: Not Specified (Manual covers multiple model years) Generation: Not Specified 📋 Manual Details Document Info Manual Type: Service Repair Manual Language: English Page Count: 790 Format: PDF Availability: Downloadable Compatibility: Windows & Mac ⚙️ Engine Specifications General Engine Type: V-6 Displacement: 262 CID / 4.3L Fuel System Carbureted: Mercarb 2 Barrel / Weber 4 Barrel Fuel System Efi: Electronic Fuel Injection Ignition System: Covered in Section 4 Cooling System: Seawater Cooled / Closed Cooled Exhaust System: Manifolds, Elbows, Risers, Collectors 🔧 Transmission Drive Options Drive Type: Alpha / Bravo Sterndrives Drive Shaft Models: Covered in Section 8 🔧 Maintenance General Maintenance Maintenance Instructions: Covered in Section 1B Troubleshooting: Covered in Section 1C Printable Pages: Yes 📄 Diagnostics Troubleshooting Diagnostics Coverage: EFI System Diagnostics and Troubleshooting 📄 Electrical Systems Electrical Systems Covered: Starting, Ignition, Charging, Instrumentation, Wiring Diagrams 📄 Performance Power Steering Power Steering System: Pump and Related Components