This comprehensive service repair manual provides detailed instructions for maintaining and servicing Mercury Mariner outboard motors with 70, 75, 80, 90, 100, and 115 horsepower, covering models produced between 1987 and 1993. The manual covers a wide range of topics, from basic maintenance to complex repairs, including detailed information on the following: **General Information and Specifications:** This section provides essential information about your outboard motor, including engine specifications, identification numbers, and safety precautions. **Electrical and Ignition Systems:** This section covers the intricacies of your outboard motor's electrical and ignition systems, including detailed diagrams and instructions for troubleshooting and repairing components like the ignition system, battery, charging system, starting system, timing, and synchronizing. **Fuel System and Carburetion, Oil Injection System:** This section delves into the fuel and oil systems, including the carburetor, fuel lines, fuel pump, and oil injection system. You'll find detailed instructions for troubleshooting and servicing these critical components. **Powerhead (3-Cylinder and 4-Cylinder Engines):** This section provides in-depth coverage of the powerhead, including detailed information on the cylinder head, crankshaft, camshaft, pistons, connecting rods, and other internal components, allowing you to diagnose and repair related issues. **Lower Unit:** This section focuses on the lower unit, which houses the gears and propellers, providing detailed instructions for servicing and repairing the gear housing, mid-section, and shock absorber. You will learn the intricacies of these components and how to maintain their proper operation. **Power Trim:** This section explains the operation and maintenance of your outboard's power trim system, covering both Design I (side fill reservoir) and Design II (aft fill reservoir) systems, as well as single-ram systems. **Outboard Motor Installation and Attachments:** This section covers the installation and attachment of your outboard motor, providing comprehensive guidance on engine attachments, installation procedures, tiller handle, and co-pilot configuration. This manual includes numerous pictures, diagrams, and charts, providing clear visual aids alongside step-by-step instructions to guide you through each repair procedure. Whether you need to perform routine maintenance or tackle complex repairs, this service manual provides the comprehensive technical information you need to keep your Mercury Mariner outboard motor running smoothly.

The Mercury Mariner Outboard 70-115 HP Service Repair Manual is a comprehensive digital resource designed for technicians and boat owners who want to maintain and repair their Mariner outboard motors. This manual covers a wide range of models, including the 70, 75, 80, 90, 100, and 115 horsepower Mariner outboards, providing detailed instructions for a variety of procedures. Whether you're a seasoned mechanic or a DIY enthusiast, this manual offers step-by-step guidance, clear diagrams, and troubleshooting tips to help you diagnose and repair common problems. The manual encompasses numerous aspects of engine maintenance and repair. It includes information on engine disassembly and assembly, lubrication systems, fuel systems, ignition systems, electrical systems, cooling systems, steering systems, and more. It also provides detailed specifications for each model, including engine dimensions, torque values, and recommended fluids. Additionally, the manual features troubleshooting tables for common engine problems, allowing users to quickly identify potential causes and solutions. This comprehensive approach ensures that readers have access to the information they need to perform a wide range of repairs and maintenance tasks, from routine oil changes to complex engine overhauls.