Mercury 45hp, 50hp, 60hp, 65hp, 70hp, 75hp, 80hp, 85hp, 90hp, 100hp, 115hp Outboard Motor Diagnostic & Repair Manual (1965-1989)

The Definitive Repair Manual for Classic Mercury 45 HP to 115 HP 2-Stroke Outboards (1965-1989)

Ensure peak performance and reliable service for your vintage Mercury outboard with this comprehensive diagnostic and repair manual.

If you own or service a classic mid-range Mercury engine manufactured between 1965 and 1989, this manual is the single most crucial resource you will find. It provides factory-level detail for the entire line of 2-Stroke engines spanning from 45 horsepower all the way up to 115 horsepower. Stop guessing and start repairing with confidence.

Unmatched Model Coverage: Are Your Engines Inside?

This book meticulously covers every variation within the 45 HP to 115 HP range, including specific model designations and engine configurations (3-cylinder and 4-cylinder) throughout the entire 25-year production run.

Covered Horsepower & Model Series:

• 45 HP: All 4-cylinder models (1965-1970).
• 50 HP: Includes both the later 3-cylinder (1986-1989) and the iconic 4-cylinder 500/50 HP series (1965-1985).
• 60 HP: All 3-cylinder engines (1984-1989).
• 65 HP: Detailed coverage for both 3-cylinder (1972-1976) and early 4-cylinder 650/65 HP models (1965-1971).
• 70 HP: Service information for all 3-cylinder models, including the 650, 700/70 HP designation (1976-1989).
• 75 HP: 4-cylinder models (1984-1986).
• 80 HP: Covers the 3-cylinder (1987-1989) and the older 4-cylinder 800/80 HP series (1969-1983).
• 85 HP: 4-cylinder 850/85 HP models (1973-1977).
• 90 HP: Includes both the standard 3-cylinder (1987-1989) and the rare 4-cylinder 850XS/90 HP model (1976).
• 100 HP & 115 HP: Complete service for the later 4-cylinder engines (1988-1989).

Key Areas of Expertise: What You Will Learn

This repair manual transforms complex service jobs into straightforward, step-by-step procedures. For every model listed above, you receive the detailed instructions needed to perform maintenance, diagnostics, and overhauls.

Critical Service Chapters Include:

• Powerhead Overhaul: From disassembly and inspection of the crankshaft and cylinder block to final reassembly, ensuring a professional-grade rebuild.
• Fuel System Service: Complete carburetor inspection, cleaning, rebuilding, and adjustment procedures for smooth idling and top-end performance.
• Ignition & Electrical Diagnostics: Clear wiring diagrams, coil testing, timing adjustment, and essential troubleshooting charts for reliable starting.