1988-1993 Mercury Mariner Outboard Motor 100hp, 115hp Service Manual

This manual covers Mercury Mariner 100hp and 115hp outboard motors from 1988-1993. Includes detailed procedures, diagrams, and specifications for maintenance and repair. Part No. 90-13645-2.

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Document Details

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Document Number / Seller:
27511 / Rebecca Smith
File Size:
8.37 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Jul 25, 2025

Models Covered & Key Technical Specifications

Mercury Mariner 100hp, 115hp (90-13645-2) Outboard Service Manual: 1988-1993 Factory-Standards Covers 100hp, 115hp (4-Cylinder) models from 1988-1993.

  • General Specification: 100 HP (74.6 kw) represents the standard power output for the specified model. | Ignition Type: C.D. Breakerless defines the ignition system architecture. | Fuel Tank Capacity: 6.6 U.S. Gallons signifies the maximum fuel reserve Capacity. | Engine Weight: ELO 340 lbs. is the specified weight for the standard configuration. | Gear Ratio: 2.07:1 delivers the rotational speed ratio Parameters. | Recommended Gasoline: Regular Leaded, Premium, Low-Lead and Lead-Free automotive gasolines are suitable for optimal operation Baseline.

Professional Workshop Service Manual & Technical Specifications

Mercury Mariner 100hp, 115hp Outboard Service Manual: 1988-1993 Factory-Standards

Procedure-Type: 1988-1993 Mercury Mariner 100hp, 115hp Outboard Motors | Conceptual-Layout: Repair and Service Documentation | Procedure-Type: Comprehensive Guide

Table Of Contents

The repository is divided into sections covering general specifications, electrical systems, fuel systems, powerheads, and lower units, providing a comprehensive overview of the outboard motor's components and their maintenance procedures.

Introduction

This manual provides detailed information on the service and repair of Mercury Mariner outboard motors, specifically models 100hp and 115hp manufactured between 1988 and 1993. It includes essential specifications, troubleshooting guides, and step-by-step procedures for various systems.

Systems Documentation

Detailed documentation covers the electrical system, including ignition and charging, as well as the fuel system with carburetor adjustments and troubleshooting. The powerhead and lower unit components are thoroughly explained, with sections on disassembly, reassembly, and maintenance of critical parts like the crankshaft, pistons, and water pump.

Procedures

Specific procedures address tasks such as timing adjustments, carburetor synchronization, oil injection system maintenance, and gear housing lubrication. Torque specifications and sequences are provided for various fasteners to ensure correct assembly and prevent damage.

Specifications Table

Service-Nexus Rating Validation-Data
Horsepower 100 HP (74.6 kW) Standard output specified
Fuel Tank Capacity 6.6 U.S. Gallons Maximum fuel reserve Capacity
Engine Weight ELO 340 lbs. Standard configuration weight
Gear Ratio 2.07:1 Rotational speed ratio Parameters
Ignition Type C.D. Breakerless Ignition system architecture
Recommended Gasoline Regular Leaded, Premium, Low-Lead and Lead-Free Minimum octane rating of 86 required for optimal operation Base

FAQ

Reference the **tool** requirements for ignition system testing. keyboard_arrow_down

A Multi-Meter/DVA Tester (91-99750) or a voltmeter capable of measuring 400 volts DC is required for ignition system checks.

What are the **essential** electrical values for stator testing? keyboard_arrow_down

For 16 Ampere STATORS (4 CYLINDER), the resistance between Red Stator Lead and Red/White Stator Lead (Hi-Speed) should be 90-140 OHMS (R x 1).

Specify the **correct** calibration settings for idle RPM. keyboard_arrow_down

An engine idle RPM of 650-700 RPM in “Forward” gear is the correct calibration setting, adjusted via the idle timing screw.

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This manual is a lifesaver for maintaining my 1990 Mercury Mariner. The download process was seamless, and I received the link via email almost instantly. Highly recommend!