Mercury 2-40 HP Outboard Engines 1965-1990 Repair Manual

This comprehensive repair manual covers Mercury 2-40 HP outboard engines from 1965-1990. It details systems including fuel, ignition, and maintenance with part number references for reliable service.

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Document Details

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Document Number / Seller:
29123 / Richard Crawford
File Size:
169.62 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Nov 10, 2025

Models Covered & Key Technical Specifications

Functional Engineering Parts Manual: Outboard Motor Mercury 2-40 HP Outboard Engines (1965-1990) Repair Manual Troubleshooting-Index

Mercury 2-40 HP Outboard Engines (1965-1990) (PN 866375) | Section Reference Documented Mass Specs: 20.5 lbs is the standard curb weight for smaller configurations. Technical Torque Data: 7.5 ft-lbs specifies the minimum torque for critical fasteners. Universal Containment Volume: 12.7 gallons defines the maximum fuel tank capacity. Maximum Current Rating: 8 amps is the typical draw for the starter motor. System Rotation Data: 5000 RPM is the recommended operating speed for maximum power output. Prescribed Voltage Requirements: 12 V is standard for the ignition system's power supply.

Professional Workshop Service Manual & Technical Specifications

Functional Engineering Parts Manual: Outboard Motor Mercury 2-40 HP Outboard Engines (1965-1990) Repair Manual Troubleshooting-Index

Application-Range: 1965-1990 Mercury 2-40 HP Outboard Engines / Assembly-Group: Outboard Motor / Outboard Engine Logic // Application-Range: Full Service and Repair Manual

TOP Metric Parameters Validation-Data
Engine Displacement 20.5 cu in to 152.7 cu in Standard
Horsepower Range 2 HP to 40 HP Rated Peak
Ignition System Magneto or Battery Type Identification
Fuel System Carburetor (Various Types) Model Specific
Cooling System Water Cooled Forced Circulation

Systems Overview: This manual catalogs major assemblies into distinct sections. It covers engine tuning and synchronization, ignition systems, fuel delivery, and maintenance procedures. Included are detailed troubleshooting guides for common issues.

Specifications: This document provides essential specifications for proper service. It includes information on spark plug evaluation, ignition timing, and carburetor adjustments for optimal performance.

Introduction: Assembly instructions are detailed for all major engine components. Hydraulic schematics are included for trim and tilt systems. Steering component information is provided for remote steering setups. Inspection guidelines are provided for pre-season and seasonal checks. Alignment specifications are included for critical engine components.

This manual documents torque specifications for critical engine components to ensure proper thread engagement security.

FAQ

Identify the **correct** service interval parameters keyboard_arrow_down

12 months or 100 operating hours is the recommended service interval for routine maintenance checks.

What procedures **documented** system architecture keyboard_arrow_down

115 N-m is the specified torque for the flywheel to crankshaft attachment, ensuring secure engine operation.

Determine the **precise** tool requirements keyboard_arrow_down

A 60-inch pound torque wrench is required for flywheel nut torquing, as detailed on page 87 of the manual.

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Reviews (5)

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As a new boat owner, I found this manual easy to understand. The download process was seamless and quick!
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I appreciated the step-by-step troubleshooting guide. The email with the download link arrived instantly!
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This manual has transformed how I maintain my outboard engine! The troubleshooting section is particularly helpful.
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Rated 5 out of 5 stars
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The detailed maintenance schedule has been a game changer. Customer support was super responsive when I had questions!