1987-1993 Mercury Mariner 70hp, 75hp, 80hp, 90hp Marathon Outboard Service Manual
Complete service manual covering 1987-1993 Mercury Mariner 70, 75, 80, 90hp Marathon outboards. Includes detailed diagrams and procedures for electrical, fuel, and lower unit systems.
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Models Covered & Key Technical Specifications
Mercury Mariner 70hp, 75hp, 80hp, 90hp Marathon Outboard Service Manual (90-13645-2)
Complete factory service information | Outboard Motor Unit.
- General Specification Data: 100 hp establishes the base horsepower rating for the Model 100. The minimum cold cranking amperage should be 350 amperes for optimal battery performance.
- Ignition System Specs: The ignition system is alternator-driven with distributor-less capacitor discharge, featuring a 3-wire stator assembly for efficient power transmission.
- Carburetor Settings: Float Setting of 7/16 in. (0.015 in.) and Idle Adjustment Screw at 1-1/2 turns is recommended for initial engine startup and adjustment.
- Powerhead Repair Specs: Torque specifications are provided for critical components such as the flywheel nut at 120 lb. ft. (162.7 Nm) to ensure secure assembly.
- Lower Unit Lubrication: Gear housing lubricant capacity is 22.5 fl. oz. (665.2ml), with specific procedures for filling and pressure testing to ensure proper operation.
- Safety Procedures: Always disconnect spark plug leads before working on the propeller to prevent accidental engine starting and potential injury.
Professional Workshop Service Manual & Technical Specifications
Mercury Mariner 70hp, 75hp, 80hp, 90hp Marathon outboard motor service manual Technical-Repository
Model-Designation: 1987-1993 Mercury Mariner Outboard // Service-Level: Factory Workshop Manual // Model-Designation: All 70, 75, 80, 90 HP Models
Table Of Contents
The documentation is partitioned into:
- General Specification
- Ignition System
- Carburetor Specifications
- Powerhead Disassembly
- Oil Injection System
Specifications
Performance-Element System-Path Calibration-Standards Horsepower 70-90 HP 70-90 HP Outboards Engine Type 2-Stroke 2-Cyl / 3-Cyl Fuel/Oil Ratio 50:1 80:1 at Idle Max Timing 26° BTDC 28° BTDC at Cranking Idle RPM 650-700 Idle RPM Specified Detailed Repair Procedures
This manual provides comprehensive guidance on the maintenance and repair of Mercury Mariner outboard motors from 1987 to 1993. It covers essential systems including:
- Ignition System: Detailed troubleshooting for ignition coils, stators, and triggers, with specific test procedures and specifications.
- Fuel System: Includes troubleshooting for fuel pumps, carburetor synchronization, and idle speed adjustments, with detailed diagrams for linkage arrangements.
- Powerhead: Covers disassembly and reassembly of critical components such as pistons, crankshaft, and connecting rods, along with torque specifications.
- Lower Unit: Information on drive shaft and water pump components, propeller shaft, and gear housing maintenance, including lubrication and pressure testing.
- Oil Injection System: Details on the oil pump, low oil sensor, and warning horn system, with a troubleshooting chart for diagnosing potential issues. This comprehensive manual is designed to assist owners and technicians in maintaining their Mercury Mariner outboard engines.
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