🏷️ Basic Information Identification Make: Mercury Mercruiser Model: Mercruiser #6 Sterndrive Units R, MR, Alpha One, Alpha One SS Production Years: 1983-1990 📋 Manual Details Documentation Manual Type: Service Repair Manual Language: English Page Count: 566 Format: PDF Delivery: Instant Download Features Printable: Yes Searchable: Yes Bookmarked: Yes Illustrations: Detailed Diagrams: Exploded Diagrams Photos: Hundreds Compatibility: All Versions of Windows & Mac, APP ISO, Iphone, Ipod, Android etc. Content Content Summary: Complete tear down and rebuild, pictures and part diagrams, torque specs, maintenance, troubleshooting, diagnostic and repair procedures, detailed illustrations, diagrams, wiring schematics and specifications. Accessibility Zoom Functionality: Yes Storage Options: Hard-drive, CD-ROM ⚙️ Engine Specifications Engine Type Engine Types Covered: V6, V8, Inline 4 Displacement Engine Displacements: • 3.0L • 4.3L • 5.7L • 7.4L 🔧 Transmission Gear Ratios Available Gear Ratios R: • 1.98:1 • 1.84:1 • 1.65:1 • 1.50:1 • 1.32:1 Available Gear Ratios Mr: • 1.98:1 • 1.84:1 • 1.65:1 • 1.50:1 Available Gear Ratios Alpha One Ss: • 1.98:1 • 1.84:1 • 1.65:1 • 1.50:1 • 1.32:1 🔧 Maintenance Corrosion Protection Corrosion Protection Covered: Yes Troubleshooting Troubleshooting Covered: Yes Torque Specs Torque Specs Included: Yes 📄 Model Specific Transom Assemblies Transom Assembly Models: • MC 120R • 140B • 185R • 488R • 898R • 228R • 260R • MC 120MR • 140MR • 170MR • 185MR • 190MR • 200MR • 230MR • 260MR • 300 Tempest MR • MC Alpha One • Alpha One SS Sea Ray Cross Reference Sea Ray Models Covered: • 3.0L • 4.3L2 • 4.3L4 • 5.7L • SRX 5.7L • SRX 7.4L Mercruiser Equivalent Models: • 3.0L Alpha One • 4.3L Alpha One • 4.3LX Alpha One • 5.7L Alpha One • 350 Magnum Alpha One • 454 Magnum Alpha One