1965-1989 Mercury Outboard Motor 2-Stroke 45-115 HP Service Manual

Complete service procedures for original Mercury design 3- and 4-cylinder powerheads. Documents fuel, ignition, and powerhead systems for models 45hp through 115hp.

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Document Details

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Document Number / Seller:
31456 / Michael Johnson
File Size:
53.96 MB
File Type:
PDF
Language:
English
Pages:
555
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Mar 28, 2025

Models Covered & Key Technical Specifications

Mercury Outboard Motor 45-115 HP (1965-1989) Service Manual Service procedures for original Mercury design 3- and 4-cylinder powerheads. Specification Value Context
Reference 555 pages of detailed service and repair information.
Integral 12 Sections covering various aspects of outboard motor maintenance and repair.
General 4-Cylinder Models are covered with specific procedures and diagrams.
Certified 3-Cylinder Models have dedicated sections for their unique components and systems.
Factory 2-Stroke Cycle principles are explained for optimal understanding and performance.
Established Troubleshooting Guides are provided for common issues like fuel system problems and ignition system faults.

Professional Workshop Service Manual & Technical Specifications

Mercury Outboard Motor 45-115 HP (1965-1989) Service Manual

Coverage-Scope: All 1965-1989 Mercury Outboard Motors, 2-Stroke, 45-115 HP // System-Coverage: Fuel, Ignition, Powerhead, Carburetor, Oil Injection, and Troubleshooting Logic // Model-Portfolio: 45hp, 50hp, 60hp, 65hp, 70hp, 75hp, 80hp, 85hp, 90hp, 100hp, 115hp Outboard Motors

Introduction

This manual provides comprehensive service, repair, and diagnostic procedures for Mercury outboard motors from 1965 to 1989. It covers a wide range of horsepower and cylinder configurations, focusing on 2-stroke cycle engines.

Powerhead Service

Detailed instructions for both original design and redesigned Mercury 3- and 4-cylinder powerheads are included. This covers powerhead components, disassembly, cleaning, inspection, and assembly, ensuring proper engine performance and longevity.

Fuel System and Carburetor Service

The manual thoroughly explains the fuel system, including the fuel tank, fuel pump, filters, and carburetors. It details troubleshooting for fuel problems, carburetor adjustments, and provides exploded views for identification and service.

Ignition System Service

Covers Type I Kiekhaefer Distributor magneto systems with points, Thunderbolt ignition, and other ignition types. Includes detailed procedures for spark plug evaluation, polarity checks, and magneto servicing.

Oil Injection System

Explains both the "Auto Blend" and

FAQ

Confirm the **recommended** diagnostic procedures for ignition system issues? keyboard_arrow_down

4- Cylinder models generally require a spark every 90 degrees of crankshaft rotation. Refer to Section 5-5 for specific ignition system details and troubleshooting steps for Type I Kiekhaefer magnetos.

What tools **calibrated** fluid capacity requirements are covered in this manual? keyboard_arrow_down

This manual details various fluid capacities related to engine maintenance, such as lower unit oil, but does not specifically list calibrated fluid capacities for all components.

Identify the **applicable** component identification for carburetors? keyboard_arrow_down

Four types of carburetors (A, B, C, and D) are used, identified by their bowl design and features. Carburetor identification for your specific model can be found in the Appendix.

What procedures **exact** adjustment procedures are detailed for the idle mixture screw? keyboard_arrow_down

Idle mixture screws should be adjusted slowly, turning counterclockwise for a richer mixture and clockwise for a leaner one. The recommended setting is halfway between lean and rich, favoring the rich side.

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This manual is a lifesaver! The step-by-step instructions and diagrams make it easy to follow. I had a quick question about the download, and their support team responded almost immediately. Highly recommended!
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Rated 4 out of 5 stars