🏷️ Basic Information Identification Make: Mercury Mercruiser Model: Mercruiser #3 Marine Engines (GM 4 Cylinder, GM 6 Cylinder, GM V-8 Cylinder) Year: 1978-1984 📋 Manual Details Manual Information Manual Type: Service Repair Manual Language: English Page Count: 1092 Format: PDF Download Features Features: • Complete tear down and rebuild • Pictures and part diagrams • Torque specs • Maintenance procedures • Troubleshooting guides • Detailed illustrations • Diagrams • Wiring schematics • Step-by-step instructions • Printable pages • Bookmarked • Searchable Compatibility Compatible Devices: • Windows • Mac • APP ISO • iPhone • iPod • Android Delivery Method Delivery Type: Instant Download Requirements Software Requirement: Adobe PDF Reader ⚙️ Engine Specifications Engine Types Engine Types Covered: • GM 4 Cylinder • GM 6 Cylinder • GM V-8 Cylinder Engine Identification Specific Engine Models: • MCM 120 • MCM 120R • MCM 140 • MCM 140R • MCM 165 • MCM 470 • MCM 470R • MCM 485 • MCM 488R • MCM 898 • MCM 898R • MCM 228 • MCM 228R • MCM 260 • MCM 260R • MCM 330 • MCM 330 (8-W) • MCM 370/400 • MCM 400 Cyclone • MCM 440 Cyclone • MCM 460 Cyclone • MCM 475 Turbo • MCM 470TR • MCM 230TR • MCM 260TR • MIE 470 • MIE 228 • MIE 230 • MIE 255 • MIE 260 • MIE 330 • MIE 340 Engine Features Engine Description: Based on GM engine blocks with Mercury Marine additions and marinization. Engine Variations Variations Covered: • Seawater Cooled • Closed Cooled • Driveshaft Extension Models • Cyclone Models • Turbo Models Engine Configurations Configurations: • Inline 4-Cylinder • Inline 6-Cylinder • V-8 Cylinder Power Steering Power Steering System: Covered within the manual. Fuel Systems Carburetor Types Covered: • Rochester 2 Barrel • MerCarb 2 Barrel • Rochester 4 Barrel • Holley 4 Barrel Exhaust Systems Exhaust Components: • Manifolds • Elbows • Risers • Collectors Cooling Systems Cooling System Types: • Seawater Cooled • Closed Cooled • Specific models like 470/485/488 Drive Systems Drive System Components: • Driveshaft Models • Propeller Shaft 🔧 Transmission Transmission Types Transmission Types Covered: • Velvet Drive (Borg-Warner) • Mercury Marine Transmission 🔧 Maintenance General Maintenance Maintenance Scope: Comprehensive maintenance procedures for all covered models. Troubleshooting Troubleshooting Coverage: Detailed troubleshooting guides for common issues.