🏷️ Basic Information Identification Make: Mercury Model: Mariner Sub Model: 30/40 (2 Cylinder) Specific Models Covered: 30 Marathon, 30 Sea Pro, 40 Marathon, 40 Sea Pro Serial Number Range: 0G044027 and Above 📋 Manual Details Manual Information Manual Type: Workshop Service Repair Manual Format: PDF (within RAR archive) Language: English Delivery Delivery Method: Instant Download File Format: RAR ⚙️ Engine Specifications Engine Type Engine Type: Outboard Cylinder Configuration Cylinder Configuration: 2 Cylinder Power Output Horsepower 30Hp Models: 30 HP (estimated, based on model name) Horsepower 40Hp Models: 40 HP (estimated, based on model name) Displacement Displacement: Not explicitly stated, but typical for 2-cylinder 30/40 HP outboards of this era Ignition Ignition System: Electrical Ignition System 🔧 Maintenance Covered Topics Tune Up Procedures: Yes Timing Adjustments: Yes Fuel System Maintenance: Yes Part Numbers: Yes 📄 Repair Information General Repair Repair Scope: All repair procedures covered in great detail Troubleshooting Troubleshooting Coverage: Yes Components Lower Unit Repair: Yes Gear Case Repair: Yes Tilt And Trim: Yes Rewind Starter: Yes Special Equipment Tools And Techniques: Yes Visual Aids Diagrams And Pictures: Detailed Pictures And Diagrams