This comprehensive Mercury Mariner 70 75 80 90 HP Outboard Factory Service Repair Manual covers all models from 1987 to 1993. It provides detailed, step-by-step instructions and illustrations to guide you through all aspects of maintaining and repairing your outboard motor. This manual is a valuable resource for anyone who wants to perform their own repairs or simply gain a deeper understanding of their outboard motor.

The manual covers a wide range of topics, including:

* General Information and Specifications: Get familiar with the technical details, dimensions, and specifications of your Mercury Mariner outboard motor.
* Electrical and Ignition: Understand the fundamentals of your outboard's electrical system, including the battery, charging system, starting system, and ignition system.
* Timing and Adjustments: Learn how to properly time and synchronize your engine for optimal performance.
* Wiring Diagrams: Navigate intricate wiring diagrams to troubleshoot electrical issues and understand the flow of power within your outboard.
* Fuel System and Carburetion: Master the intricacies of your fuel system, from the fuel tank to the carburetor, ensuring smooth fuel delivery and optimal engine performance.
* Oil Injection System: Learn how to maintain and troubleshoot your outboard's oil injection system, ensuring proper lubrication and engine health.
* Powerhead: Explore the inner workings of your outboard's powerhead, covering components like cylinders, pistons, connecting rods, and crankshaft.
* Lower Unit: Understand the function and maintenance of the lower unit, including the gear housing, propeller, and drive shaft.
* Mid Section: Gain insights into the mid-section of your outboard, covering components like the steering system, power trim, and tilt mechanism.
* Shock Absorber: Learn how to inspect, maintain, and troubleshoot the shock absorber system, ensuring smooth operation and stability.
* Power Trim: Understand the mechanics of your power trim system, allowing you to control your outboard's angle for different water conditions.
* Outboard Motor Installation and Attachments: Gain knowledge on how to properly install and attach your outboard motor to your boat, ensuring secure and reliable operation.
* Engine Attachments and Installation: Learn how to install and configure various attachments to your engine, including controls, gauges, and other accessories.
* Tiller Handle and Co-Pilot: Discover the proper use and operation of the tiller handle and co-pilot systems, providing control and maneuverability.

The manual provides clear instructions, detailed diagrams, and comprehensive troubleshooting guides to help you diagnose and solve any problems you may encounter. It's a valuable resource for both beginner and experienced mechanics, allowing you to perform repairs confidently and save money on shop labor costs.