1997-1999 Mercury Mariner 115hp, 125hp Outboard Service Manual

Wiring diagrams, specifications, and maintenance procedures for Mercury Mariner 115hp and 125hp outboards, covering 1997-1999 models. Ref: 90-830234R3.

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Document Details

keyboard_arrow_down
Document Number / Seller:
27508 / Peter Grant
File Size:
13.81 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Apr 12, 2025

Models Covered & Key Technical Specifications

1997-1999 Mercury Mariner 115hp, 125hp Outboard Service Manual

Mercury Mariner Outboard Service Manual | 1997-1999 Models

  • Total Horsepower (KW): 115 (85.8) HP (KW)
  • Outboard Weight: 348 lbs. (158kg) for Model 100/115/125
  • Cylinder Block Type: In-Line 4 Cylinder, 2 Cycle, Loop Charged
  • Cylinder Displacement: 112.8 cu. in. (1848.8cc)
  • Stroke Length: 2.93 in. (74.42mm)
  • Gear Ratio: 2.07:1 for Model 100/115/125

Professional Workshop Service Manual & Technical Specifications

Mercury Mariner Outboard Service Manual: Mercury Mariner 115hp, 125hp, 1997-99 PDF Field-Reference

Technical-Benchmarks: 1997-1999 Models // Specification-Class: Outboard Motor / Mercury Mariner Logic // Technical-Benchmarks: Comprehensive Coverage

Metric Diagnostic-Logic Logic
HORSEPOWER (KW) Model 115 (85.8)
OUTBOARD WEIGHT Model 100/115/125: 348 lbs. (158kg)
CYLINDER BLOCK In-Line 4 Cylinder, 2 Cycle, Loop Charged
CYLINDER DISPLACEMENT 112.8 cu. in. (1848.8cc)
STROKE Length 2.93 in. (74.42mm)
GEAR RATIO 2.07:1 (100/115/125 Models)

Service sections detail:

Fuel System Procedures

Ignition System Diagnostics

Charging System Tests

Starting System Overhaul

Lubrication Points

Properly requiring: Detailed component specifications and troubleshooting procedures for 1997-1999 Mercury Mariner 115hp and 125hp outboard models. This manual documents torque specifications for various components to ensure proper cyclic stress resistance. It covers ignition system checks, fuel system maintenance, and charging system troubleshooting for optimal engine reliability.

FAQ

What is the **exact** assembly sequence for the ignition coils? keyboard_arrow_down

3 Ignition coils are mounted adjacent to the flywheel center hub. Coil assembly involves aligning the flywheel key, installing the flywheel, and torquing the locknut to 100 lb. ft. (136 N·m).

Reference the **specific** service interval parameters for routine maintenance. keyboard_arrow_down

Every 100 Hours of Use or Once Yearly: Lubricate all lubrication points, inspect and clean spark plugs, check engine fuel filter, adjust carburetor(s), check engine timing setup, check corrosion control anodes, drain and replace gear case lubricant, lubricate drive shaft splines, check valve clearance, check power trim fluid, and inspect battery.

What are the **designated** system architecture specifications for the fuel pump? keyboard_arrow_down

The fuel pump is a crankcase-pressure-operated, diaphragm-type pump. For 80 Jet/100/115/125 models, the fuel pump uses a 0.030 in. (0.76mm) gap between the accelerator pump and throttle cam for correct fuel discharge.

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Reviews (3)

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New
This service manual has been a lifesaver for my 1998 Mariner. The detailed sections on engine maintenance and troubleshooting helped me fix issues I thought were beyond my capability. Plus, the download process was super smooth! Highly recommend!
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Rated 4 out of 5 stars
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New
I had a question about the manual, and the support team responded quickly with all the information I needed. The manual itself is comprehensive and easy to navigate. Very satisfied with my purchase!