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Mercury 8 User Manual

Mercury 8
126 pages
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STORAGE
97
Positioning Outboard For Storage
NOTICE
Storing the outboard in a tilted position can damage the outboard.
Water trapped in the cooling passages or rain water collected in
the propeller exhaust outlet in the gearcase can freeze. Store the
outboard in the full down position.
To prevent problems which can be caused by oil entering the
cylinders from the sump, store the outboard only in one of the
four positions shown.
a
b
c
d
10375
a - Upright position
b - Tiller handle down
c - Front side up
d - Front side down
Never carry, store or transport the outboard in the position
shown. Engine damage could result from oil draining out of
the crankcase.
10378
Battery Storage
Follow the battery manufacturer's instructions for storage and
recharging.

Table of Contents

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Mercury 8 Specifications

General IconGeneral
Full Throttle RPM5000-6000 RPM
Cylinders2
Gear Ratio2.08:1
Horsepower8 HP
StartingManual
Shaft Length15 in, 20 in
Fuel Tank CapacityExternal

Summary

Declaration of Conformity

Warranty Information

Transfer Of Warranty

Process for transferring the limited warranty to a subsequent owner.

Warranty Registration United States And Canada

Instructions for registering the product with Mercury Marine in the US and Canada.

Warranty Registration Outside The United States And Canada

Procedures for registering the product outside the US and Canada.

FourStroke Outboard Limited Warranty United States, Canada, Europe and Confederation of Independent States

Details the limited warranty for outboards in specific geographical regions.

FourStroke Outboard Limited Warranty (Middle‑East, and Africa)

Specifies the limited warranty terms for outboards in the Middle East and Africa.

3 Year Limited Warranty Against Corrosion

Outlines the three-year warranty coverage against corrosion damage.

Warranty Coverage And Exclusions

Clarifies what is covered by warranty and common exclusions.

General Information

Boater's Responsibilities

Defines the operator's duties for safe boat operation and occupant safety.

Before Operating Your Outboard

Guidance on reading the manual and understanding safe operation.

Boat Horsepower Capacity

Information on maximum horsepower limits and capacity plates.

High‑Speed and High‑Performance Boat Operation

Recommendations for operating high-speed or high-performance boats.

Outboard Remote Control Models

Details about remote control setup for starting.

Remote Steering Notice

Important safety notice regarding steering link rod fasteners.

Lanyard Stop Switch

Explains the purpose and function of the lanyard stop switch.

Protecting People In The Water

Safety guidelines for preventing injury to people in the water.

Passenger Safety Message ‑ Pontoon Boats And Deck Boats

Safety advice for passengers on pontoon and deck boats.

Wave And Wake Jumping

Hazards and precautions related to operating over waves and wakes.

Impact with Underwater Hazards

Guidance on operating in shallow water and avoiding underwater obstacles.

Exhaust Emissions

Alerts about carbon monoxide poisoning from engine exhaust.

Selecting Accessories For Your Outboard

Advice on choosing and installing genuine Mercury accessories.

Safe Boating Suggestions

General recommendations for safe boating practices.

Recording Serial Number

Instructions on recording the outboard's serial number for reference.

8/9.9 4‑Stroke Specifications ‑ International

Technical specifications for 8/9.9 4-Stroke models sold internationally.

Component Identification - Standard Models

Diagrams identifying components on standard outboard models.

Component Identification - Bigfoot Models

Diagrams identifying components on Bigfoot outboard models.

Transporting

Carrying, Storing and Transporting Your Outboard When Removed From Boat

Procedures for safely carrying and transporting the outboard.

Transporting Portable Fuel Tanks

Safety warnings and instructions for transporting portable fuel tanks.

Trailering Boat/Outboard ‑ Models with Power Tilt

Guidance on trailering boats with power tilt outboards.

Trailering Boat/Outboard ‑ Models without Power Tilt

Guidance on trailering boats with non-power tilt outboards.

Fuel and Oil

Fuel Recommendations

Guidelines on recommended gasoline types, octane ratings, and fuel quality.

Engine Oil Recommendations

Specifications for recommended engine oil viscosity and classifications.

Checking Engine Oil

Instructions on how to check the engine oil level correctly.

Features and Controls

Tiller Handle Features

Description of controls and features on the tiller handle.

Remote Control Features

Explanation of controls and features on remote control units.

Warning System

Details on the engine's warning system and oil pressure light.

Power Tilt (if equipped)

Explanation of the power tilt function for adjusting outboard position.

TILTING OPERATION

Procedure for tilting the outboard up and down.

Setting The Transom Angle Of Your Outboard

How to adjust the vertical transom angle for optimal performance.

Adjusting Transom Angle

Steps to adjust the outboard's transom angle for better ride and handling.

Shallow Water Operation

Using shallow water drive positions to prevent bottom contact.

Tilting Outboard

Detailed steps for tilting the outboard to its full up position.

Trim Tab Adjustment

How to adjust the trim tab to compensate for steering torque.

Operation

Pre-Starting Check List

Essential checks to perform before starting the engine.

Operating In Freezing Temperatures

Guidelines for operating the outboard in freezing conditions.

Operating In Salt Water Or Polluted Water

Recommendations for flushing the engine after use in salt or polluted water.

Operating Outboard As An Auxiliary Engine

Instructions for using the outboard as an auxiliary power source.

Pre-Starting Instructions

Step-by-step instructions to follow before starting the engine.

Engine Break-in Procedure

Crucial steps for breaking in the engine to ensure longevity.

Starting the Engine - Tiller Handle Models

Procedure for starting the engine on tiller handle models.

Adjusting Transom Angle

Steps to adjust the outboard's transom angle for better ride and handling.

Shallow Water Operation

Using shallow water drive positions to prevent bottom contact.

Tilting Outboard

Detailed steps for tilting the outboard to its full up position.

Starting a Hot Engine

Specific procedures for starting a warm or hot engine.

Gear Shifting

How to properly shift gears for forward, neutral, and reverse.

Stopping The Engine

Instructions for safely stopping the outboard engine.

Emergency Starting

Procedure for starting the engine using the emergency starter rope.

Maintenance

Outboard Care

General advice for keeping the outboard in optimal operating condition.

OWNER RESPONSIBILITY

Defines the owner's role in performing routine engine maintenance.

Inspection And Maintenance Schedule

Lists periodic inspections and maintenance tasks required.

Flushing the Cooling System

Procedure for flushing the outboard's cooling system with fresh water.

Top Cowl Removal And Installation

Steps for removing and reinstalling the engine's top cowl.

Battery Inspection

Guidelines for inspecting the battery to ensure starting capability.

Exterior Care

Tips for cleaning and waxing the outboard's exterior finish.

Fuel System

Safety precautions and inspection procedures for the fuel system.

FUEL LINE FILTER

Instructions for inspecting and replacing the fuel line filter.

Steering Link Rod Fasteners

Important information on fastening steering link rods securely.

Corrosion Control Anode

Explanation of the corrosion control anode and its inspection.

Propeller Replacement

Safety and procedural steps for replacing the outboard propeller.

Spark Plug Inspection And Replacement

Guidance on inspecting and replacing spark plugs.

Timing Belt Inspection

How to inspect the timing belt for wear or damage.

Changing Engine Oil

Detailed procedure for changing the engine oil.

Gearcase Lubrication

Instructions for draining, filling, and checking gearcase lubricant.

Checking Power Tilt Fluid

Procedure for checking and refilling the power tilt fluid.

Submerged Outboard

Immediate service requirements for an outboard submerged in water.

Storage

Storage Preparation

Key considerations for preparing the outboard for storage.

Protecting External Outboard Components

Steps to protect external components during storage.

Protecting Internal Engine Components

Measures to protect internal engine parts during storage.

Positioning Outboard For Storage

Recommended positions for storing the outboard to prevent damage.

Battery Storage

Instructions for proper storage and maintenance of the battery.

Troubleshooting

Starter Motor Will Not Crank The Engine (Electric Start Models)

Possible causes and solutions when the starter motor doesn't crank.

Engine Will Not Start

Common reasons and troubleshooting steps for an engine that won't start.

Engine Runs Erratically

Troubleshooting steps for an engine that is running erratically.

Performance Loss

Diagnosing and resolving issues causing a loss of engine performance.

Battery Will Not Hold Charge

Possible causes and solutions for a battery that won't hold a charge.

Owner Service Assistance

Local Repair Service

Information on returning the outboard to an authorized dealer for service.

Service Away From Home

How to find service when away from your local authorized dealer.

Parts And Accessories Inquiries

Where to direct inquiries for genuine replacement parts and accessories.

Service Assistance

Steps to take if you need additional assistance with your product.

Mercury Marine Service Offices

Contact information for Mercury Marine service offices worldwide.

Engine Installation

Boat Horsepower Capacity

Information on maximum horsepower limits and capacity plates.

Start in Gear Protection

Safety feature preventing engine start in gear.

Selecting Accessories For Your Outboard

Advice on choosing and installing genuine Mercury accessories.

Installing Outboard

Step-by-step guide for correctly mounting the outboard on the transom.

Remote Control Installation

Instructions for installing the remote control system.

STEERING CABLE

Lubrication and installation of the steering cable.

Steering Link Rod Fasteners

Important information on fastening steering link rods securely.

Remote Wire Harness Connection

Procedure for connecting the remote wiring harness.

Control Cable Installation

General instructions for installing control cables.

THROTTLE CABLE INSTALLATION

Specific steps for installing the throttle control cable.

SHIFT CABLE INSTALLATION

Specific steps for installing the shift control cable.

Battery Installation - Electric Start Models

Guidance on mounting and installing the battery for electric start models.

Battery Connections

Correct procedures for connecting and disconnecting battery cables.

Propeller Installation

Safety and procedural steps for installing the outboard propeller.

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