🏷️ Basic Information Identification Make: Mercury Model: Mariner Outboard Year: Multiple (covers models 20 Jet, 20-25, 25 Marathon, 25 Seapro) Generation: Specific to the covered engine models 📋 Manual Details Document Type Manual Type: Service Manual Language: English Document Format Format: PDF Download Content Features Content Focus: Repair and Service Information Target Audience: Do-it-yourselfer and Experienced Mechanic Instruction Format: Step-by-step instructions, Detailed substeps Visual Aids: Hundreds of photos and illustrations, Detailed illustrations, drawings and photos, Enlarged inset for parts examination Safety Information: Notes, cautions and warnings Navigation: Numbered instructions, Bold figure numbers ⚙️ Engine Specifications Engine Configuration Engine Type: Outboard Motor Engine Variants Specific Models Covered: 20 Jet, 20-25, 25 Marathon, 25 Seapro Engine Power Horsepower Range: 20 HP to 25 HP (depending on specific model) Engine Displacement Displacement: Not specified in description, but expected to be specific to each engine variant Engine Cooling Cooling System: Water-cooled (typical for outboards) Fuel System Fuel Delivery: Likely carburetor based, specific type would be detailed in manual Ignition System Ignition Type: Not specified in description, but likely CDI or similar 🔧 Transmission Drive System Type: Outboard Drive Unit (Lower Unit) Gear Ratios Gears: Forward, Neutral, Reverse (standard for outboards); specific ratios would be in manual 🔧 Maintenance Lubrication Gear Lube Capacity: Specific to each model, detailed in manual Recommended Oil Type: Specific Mercury gear lube, detailed in manual Scheduled Maintenance Service Interval: Detailed in manual based on hours of operation and usage conditions Maintenance Procedures Common Tasks: Spark plug replacement, fuel filter replacement, impeller inspection/replacement, lower unit service, engine tune-up