Flushing The Cooling System; Exterior Care; Top Cowl Removal And Installation; Battery Inspection - Mercury 40 Manual

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MAINTENANCE
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INSPECTION AND MAINTENANCE SCHEDULE
(CONTINUED)
Every 100 Hours of Use or Once yearly, Whichever occurs first
1. Lubricate all lubrication points. Lubricate more frequently when used in salt
water.(page 22)
2. Inspect and clean spark plugs. (page 22)
3. Check engine fuel filter for contaminants. (page 20)
4. Adjust carburetor(s) (if required). *
5. Check engine timing setup. *
6. Check corrosion control anodes Check more frequently when used in salt
water. (page 21)
∗ These items should be serviced by an authorized dealer.
7. Drain and replace gear case lubricant. (page 22)
8. Lubricate splines on the drive shaft. *
9. Check power trim fluid. (page 22)
10. Inspect battery. (page 20)
11. Check control cable adjustments. *
12. Remove engine deposits with Mercury Precision or Quicksilver Power Tune
Engine Cleaner.
13. Check tightness of bolts, nuts, and other fasteners.
Every 300 Hours of Use or Three Years
1. Replace water pump impeller (more often if overheating occurs or reduced
water pressure is noted). *
Before Periods of Storage
1. Refer to Storage procedure. (page 23)
∗ These items should be serviced by an authorized dealer.
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FLUSHING THE COOLING SYSTEM

Flush the internal water passages of the outboard with fresh water after each use
in salt, polluted, or muddy water. This will help prevent a buildup of deposits from
clogging the internal water passages.
Use a Mercury Precision or Quicksilver accessory (or equivalent) flushing
attachment.
WARNING
To avoid possible injury when flushing, remove the propeller. Refer to
Propeller Replacement.
1
Remove propeller (refer to Propeller Replacement). Install the flushing
attachment so the rubber cups fit tightly over the cooling water intake holes.
2
Attach a water hose to the flushing attachment. Turn on the water and adjust
the flow so water is leaking around the rubber cups to ensure the engine
receives an adequate supply of cooling water.
3
Start the engine and run it at idle speed in neutral shift position.
4
Adjust water flow (if necessary) so excess water continues leaking out from
around the rubber cups to ensure the engine is receiving an adequate supply
of cooling water.
5
Check for a steady stream of water flowing out of the water pump indicator
hole. Continue flushing the outboard for 3 to 5 minutes, carefully monitoring
water supply at all times.
6
Stop the engine, turn off the water, and remove the flushing attachment.
Reinstall the propeller.
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EXTERIOR CARE

1
Your outboard is protected with a durable baked enamel finish. Clean and wax
often using marine cleaners and waxes.
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TOP COWL REMOVAL AND INSTALLATION

Removal
2
Release the front and rear cowl latches. Lift the top cowl from the outboard.
Installation
3
Position the top cowl over the engine. Make sure the bottom rubber seal fits
properly and lock the rear and front latches.
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BATTERY INSPECTION

The battery should be inspected at periodic intervals to ensure proper engine
starting capability.
IMPORTANT: Read the safety and maintenance instructions which
accompany your battery.
1. Turn off the engine before servicing the battery.
2. Add water as necessary to keep the battery full.
3. Make sure the battery is secure against movement.
4. Battery cable terminals should be clean, tight, and correctly installed. Positive
to positive and negative to negative.
5. Make sure the battery is equipped with a nonconductive shield to prevent
accidental shorting of battery terminals.
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FUEL SYSTEM

Avoid serious injury or death from gasoline fire or explosion. Carefully
follow all fuel system service instructions. Always stop the engine and
DO NOT smoke or allow open flames or sparks in the area while servicing
any part of the fuel system.
Before servicing any part of the fuel system, stop engine and disconnect the
battery. Drain the fuel system completely. Use an approved container to collect
and store fuel. Wipe up any spillage immediately. Material used to contain spillage
must be disposed of in an approved receptacle. Any fuel system service must be
performed in a well ventilated area. Inspect any completed service work for sign
of fuel leakage.
Fuel Line Filter
1
Inspect the fuel line filter. If the filter appears to be contaminated, remove and
replace.
IMPORTANT: Visually inspect for fuel leakage from the filter connections by
squeezing the primer bulb until firm, forcing fuel into the filter.
Fuel Line Inspection
Visually inspect the fuel line and primer bulb for cracks, swelling, leaks, hardness,
or other signs of deterioration or damage. If any of these conditions is found, the
fuel line or primer bulb must be replaced.
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WARNING
90–10170R40