🏷️ Basic Information Identification Make: Mercury Model: Mariner Outboard Engine Variant: 30 HP, 40 HP Engine Configuration: 2-cylinder Engine Stroke: 2-stroke Covered Models Model Names: 30, 30 Marathon, 30 Sea Pro, 40, 40 Marathon, 40 Sea Pro Serial Numbers Us Serial Start: 0G044027 Belgium Serial Start: 09855139 📋 Manual Details Manual Information Manual Type: Service Repair Manual Manual Format: PDF Language: English Compatibility: WINDOWS and MAC Requirements: Adobe PDF Reader Printable: Yes Content Type: Step-by-step instructions, hundreds of photos and illustrations ⚙️ Engine Specifications Performance Horsepower 30Hp: 30 HP Horsepower 40Hp: 40 HP Engine Type Engine Type: 2-stroke, 2-cylinder Technical Details Cooling System: Water-cooled (assumed, typical for outboard motors) Ignition System: CDI (Capacitor Discharge Ignition) (assumed, typical for this era/HP) Starting System: Manual Starter (specifically mentioned in manual contents) Fuel System Fuel Delivery: Carburetor (assumed, typical for 2-stroke of this type) Lubrication Oil Mixing: Pre-mix or Oil Injection (assumed, dependent on specific sub-model) 🔧 Transmission Gear Shifting Gear Positions: Forward, Neutral, Reverse (assumed, typical for outboard motors) 🔧 Maintenance Service Procedures Maintenance Scope: Comprehensive service and repair procedures Disassembly Level: Complete disassembly Manual Sections: Electrical, Fuel System, Powerhead, Mid-section, Lower Unit, Attachments/Control Linkage, Manual Starter