Mercury 40/50EO User Manual

i
Thank You
for your purchase of one of the finest outboards available. You
have made a sound investment in boating pleasure. Your
outboard has been manufactured by Mercury Marine, a world
leader in marine technology and outboard manufacturing
since 1939. These years of experience have been committed
to the goal of producing the finest quality products. This led to
Mercury Marine's reputation for strict quality control,
excellence, durability, lasting performance and being the best
at providing after the sale support.
Please read this manual carefully before operating your
outboard. This manual has been prepared to assist you in the
operation, safe use and care of your outboard.
All of us at Mercury Marine took pride in building your outboard
and wish you many years of happy and safe boating.
Again, thank you for your confidence in Mercury Marine.
EPA Emissions Regulations
Outboards sold by Mercury Marine in the United States are
certified to the United States Environmental Protection
Agency as conforming to the requirements of the regulations
for the control of air pollution from new outboard motors. This
certification is contingent on certain adjustments being set to
factory standards. For this reason, the factory procedure for
servicing the product must be strictly followed and, wherever
practicable, returned to the original intent of the design.
Maintenance, replacement, or repair of the emission
control devices and systems may be performed by any
marine engine repair establishment or individual.
Engines are labeled with an Emission Control Information
decal as permanent evidence of EPA certification.
!
WARNING
The engine exhaust from this product contains chemicals
known to the state of California to cause cancer, birth defects
or other reproductive harm.
© 2010 Mercury Marine 40/50 90-10262081 110

Mercury 40/50EO Specifications

General

Horsepower	40/50 hp
Steering	Remote
Starting System	Electric
Shaft Length	20"
Cooling System	Water-cooled

Summary

Warranty Information

Outboard Limited Warranty

Explains coverage, duration, and conditions for the limited warranty.

3 Year Corrosion Warranty

Details the limited warranty against corrosion for three years.

Warranty Coverage and Exclusions

Clarifies what is covered and not covered by the warranty.

General Information

Boater's Responsibilities

Before Operating Your Outboard

Boat Horsepower Capacity

Warning about exceeding the boat's maximum horsepower rating.

Remote Steering Notice

Lanyard Stop Switch

Explanation of the lanyard stop switch function and importance.

Protecting People in Water

Safety advice for preventing injury to swimmers and people in water.

Passenger Safety Message

Safety guidance for passengers on pontoon and deck boats.

Impact with Underwater Hazards

Precautions and procedures for avoiding and reacting to underwater impacts.

Safe Boating Suggestions

General advice for safe and responsible boating practices.

Installation

Installing Outboard

Procedures for mounting the outboard motor on the transom.

Installing Remote Control Box

Connecting Remote Control Cables

Attaching Steering Link Rod

Battery Installation

Instructions for mounting and connecting the outboard battery.

Propeller Selection

Fuel and Oil

Fuel Recommendations

Guidelines on using unleaded gasoline and handling reformulated fuels.

Oil Recommendation

Specifies the recommended TC-W3 2-Cycle outboard oil.

Non-Oil Injected Models

Engine Break-in Fuel Mixture

Details the correct fuel mixture for engine break-in.

Oil Injected Models

Low Engine Oil Level Alarm

Explanation of the low oil alarm system and resetting procedure.

Features & Controls

Tilting Outboard Operation

Shallow Water Operation

Trim Adjustment

Steering Friction Adjustment

Throttle Grip Friction Adjustment

Trim Tab Adjustment

Operation

Pre-Starting Check List

Operating in Freezing Temperatures

Operating in Saltwater/Polluted Water

Engine Break-in Procedure

Detailed steps for the initial engine break-in period.

Starting the Engine

Step-by-step instructions for starting the outboard engine.

Gear Shifting

Procedures for shifting between forward, reverse, and neutral gears.

Emergency Starting

Instructions for starting the engine using a spare starter rope.

Engine Warm-Up

Overheat Alarm and Sensor

Information on the overheat alarm and actions to take if it sounds.

Stopping the Engine

Proper procedures for stopping the outboard engine.

Maintenance

Outboard Care

Inspection and Maintenance Schedule

Schedule for periodic inspections and maintenance tasks.

Flushing the Cooling System

Battery Inspection

Fuel System Maintenance

Cleaning Fuel Tanks and Filters

Corrosion Control Anode

Propeller Replacement

Step-by-step instructions for removing and installing the propeller.

Spark Plug Inspection and Replacement

Procedure for inspecting, cleaning, and replacing spark plugs.

Lubrication Points

Gearcase Lubrication

Instructions for checking, draining, and refilling gearcase lubricant.

Submerged Outboard Procedures

Troubleshooting

Starter Motor Issues

Diagnosing and resolving problems with the electric starter motor.

Engine Will Not Start

Common causes and solutions when the engine fails to start.

Engine Runs Erratically

Troubleshooting steps for an engine that runs unevenly or poorly.

Performance Loss

Identifying reasons for reduced engine or boat performance.

Battery Will Not Hold Charge

Diagnosing issues related to the battery not holding a charge.

Owner Service Assistance

Local Repair Service

Service Assistance Process