This comprehensive service and repair manual provides detailed instructions for maintaining and repairing Mercury and Mariner outboard motors from 1965 to 1989, covering a range of horsepower from 45 to 115 HP. It includes model-specific information for a wide array of popular outboard models, ensuring you have the right guidance for your specific engine. The manual is organized into clear and concise sections, guiding you through every step of the repair process. It starts with a comprehensive specifications section, outlining key features and dimensions of your outboard. This is followed by a detailed maintenance section, providing a complete maintenance schedule with intervals and recommendations for essential tasks like spark plug replacement, fuel line maintenance, engine oil changes, gear oil changes, lubrication, anode and bonding wire inspection, and much more. Additionally, the manual covers general information, including identification numbers, tightening torques, service data, cylinder numbering, propeller selection, and fuel recommendations. A dedicated electrical section dives into the intricacies of your outboard's electrical system, including inspection, removal, installation, and troubleshooting guides for components like the monitor tachometer, starter motor, electric starter system, battery charging system, and more. The manual also includes a thorough ignition system section, covering topics like specifications, special tools, ignition timing checks, spark plug firing order, coil resistance measurements, and troubleshooting of engine speed limiter, spark cut-out, oil pressure switch, and more. For models equipped with carburetors, you'll find complete instructions for adjustment, rebuild, removal, inspection, and cleaning to factory specifications. Topics covered include carburetor removal and disassembly, cleaning and inspection, reassembly, float height measurements, and installation. If your outboard features an electronic fuel injection system (EFI), the manual provides detailed information on its components and operation. This includes specifications, fuel injection nozzle, fuel injection pump, throttle body, fuel cooler, fuel hoses, fuel rail pressure regulator, idle speed control assembly, throttle position sensor, and more. The manual covers the intricacies of your outboard's powerhead, guiding you through the complete rebuild process back to factory specifications. It covers components such as the cylinder head cover, intake manifold assembly, ring gear cover, air intake power unit, measuring pump components, oil pump, engine lubrication system, thermostat, cylinders, crankshaft, pistons, counter balancer mechanism, and cylinder head assembly. Other sections delve into the mid-section, covering components like the engine side cover, driveshaft housing, oil pan, swivel bracket, steering bracket and clamp, water pressure valve, lower unit gear housing, and all related inspection, removal, installation, cleaning, assembly, and reassembly procedures. The manual provides a comprehensive look at the lower unit, covering topics including the gear case, propeller, lower unit gears, shimming and adjustment, trim tab, drive shaft, oil seal housing, water pump, shift guide housing, propeller shaft components, gear bearing, and propeller shaft gear housing. Finally, the manual includes additional chapters covering attachments and control linkage, throttle and shift linkage, tiller handle, manual starter, diagnostic troubleshooting, and wiring diagrams, providing a complete guide for maintaining and repairing your Mercury or Mariner outboard motor.

This comprehensive service and repair manual for Mercury and Mariner outboard motors is a valuable resource for anyone who wants to maintain or repair their 45 to 115 HP two-stroke engines. Covering a broad range of models manufactured between 1965 and 1989, this manual provides detailed instructions and illustrations for a variety of tasks, from routine maintenance to complex engine overhauls. Whether you're a seasoned mechanic or a DIY enthusiast, this manual offers the information necessary to keep your Mercury or Mariner engine running smoothly. The manual encompasses a vast array of topics, including detailed specifications for each model, step-by-step procedures for maintenance and repairs, troubleshooting guides, and comprehensive wiring diagrams. You'll find information on everything from replacing spark plugs and adjusting carburetors to performing complete engine rebuilds. The manual covers essential components like the powerhead, mid-section, lower unit, ignition system, electrical system, fuel injection system, and the carburetion system. With its clear explanations, detailed illustrations, and easy-to-follow instructions, this manual helps you diagnose problems, perform repairs, and maintain your Mercury or Mariner outboard motor to factory specifications. This manual is a must-have for any owner of a Mercury or Mariner outboard motor during this era.