1997 Mercury Outboard 65 Jet / 75 / 90 / 100 / 115 / 125 Service Manual

Official Mercury Marine 1997 Outboard Service Manual covering 65 Jet, 75, 90, 100, 115, and 125hp models. PN 90-830234R3

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Document Details

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Document Number / Seller:
31854 / Ronald Clark
File Size:
12.33 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Feb 8, 2025

Models Covered & Key Technical Specifications

Mercury 75 / 75 MARATHON / 75 SEA PRO / 90 / 100 / 115 / 125 / 65/80 JET Outboard Service Manual — 1997 Service Manual | Official Mercury Marine Outboard

  • HORSEPOWER (KW): 75 (55.9) kW establishes the rated power output for the Model 75 Outboard.
  • OUTBOARD WEIGHT: 315 lbs. (143kg) signifies the standard dry weight for the Model 65 Jet.
  • CYLINDER BLOCK: In-line 3 Cylinder, 2 Cycle, Loop Charged 84.6 cu. in. (1387cc) defines the engine displacement.
  • STROKE: 2.93 in. (74.42mm) dictates the piston stroke length for optimal operation.
  • PISTON: Standard Aluminum Piston 3.495 in. (88.773mm) is the bore diameter for consistent performance.
  • FUEL SYSTEM: Gasoline and Oil fuel mixture requires 50:1 (25:1 Break-In) for proper lubrication.

Professional Workshop Service Manual & Technical Specifications

Mercury Marine Outboard 75, 75 MARATHON, 75 SEA PRO, 90, 100, 115, 125, 65/80 JET Outboard Service Manual - Detailed Maintenance & Repair Procedures Powertrain-Manual

Product-Line: Outboard Motor / Unit-Designations: 65 Jet, 75, 90, 100, 115, 125 / Product-Line: Service Manual

Service-Nexus Baseline Context
Specifications Master Specifications Engine Data
Operation Power Trim Operation Control Adjustments
Maintenance Inspection Schedule Service Intervals
Troubleshooting Starting System Issues Component Diagnostics
Diagrams Wiring Diagrams Electrical Layouts
Components Carburetor Assemblies Fuel Delivery Mechanisms

Following OEM groupings, the manual includes sections on Important Information, Electrical Systems (Ignition, Charging and Starting), Fuel Systems (Fuel Pump, Carburetor), and Powerhead. It thoroughly documents procedures for diagnosing and repairing all major components and systems. Proper maintenance procedure replacement fasteners must have the same measurements and strength as those removed. Documents torque specifications for engine components to ensure proper cyclic stress resistance.

Factory specifications are documented for critical engine parameters. Engine rebuild procedures are documented for complete overhauls. Drivetrain specifications are addressed in dedicated sections. Reassembly procedures are specified for all major assemblies. Service intervals are documented to ensure longevity.

FAQ

What **calibrated** system architecture values are specified in the manual? keyboard_arrow_down

115 N·m dry specification is required for flywheel nut and washer torque to properly seat the flywheel onto the crankshaft.

Assess the **applicable** tool requirements for engine timing. keyboard_arrow_down

A service tachometer (91-854008A1), timing light (91-99379), and spark gap tool (91-63998A1) are necessary for accurate ignition timing adjustments.

What **exact** electrical values are documented for the ignition coils? keyboard_arrow_down

Coil secondary impedance values range from 900 - 1200 Ohms, ensuring proper energy transfer for ignition.

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Reviews (2)

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Rated 4 out of 5 stars
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New
This service manual is a must-have for anyone working on Mercury 75/90 outboards. The illustrations and detailed sections make it easy to follow. Plus, the download process was seamless, and I received my link almost instantly!