Inspection And Maintenance Schedule; Flushing The Cooling System; Top Cowl Removal And Installation; Corrosion Control Anode - Mercury 4 Manual

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MAINTENANCE
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INSPECTION AND MAINTENANCE SCHEDULE

Before Each Use
1. Visually inspect the fuel system for deterioration or leaks.
2. Check outboard for tightness on transom.
3. Check steering system for binding or loose components.
4. Check propeller blades for damage.
After Each Use
1. Flush out the outboard cooling system if operating in salt or polluted water.
(page 14)
2. Wash off all salt deposits and flush out the exhaust outlet of the propeller and
gear case with fresh water if operating in salt water.
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 16)
2. Inspect and clean spark plug. (page 15)
3. Drain and replace gear case lubricant. (page 16)
4. Check carburetor adjustments, if required. (page 15)
5. Check fuel line filter for contaminants. (page 14)
6. Check corrosion control anode. Check more frequently when used in salt
water. (page 14)
7. Lubricate splines on the drive shaft.*
8. Replace water pump impeller.*
9. Check tightness of bolts, nuts, and other fasteners.
Before Periods of Storage
1. Refer to Storage procedure. (page 17)
∗ 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.
Note: Do not run the engine while flushing the cooling system.
1
Remove plug and gasket (a) and thread-in hose coupling (b).
2
Attach a water hose to the hose coupling. Turn on the water gently and flush
the cooling system for 3 to 5 minutes.
3
Remove the thread-in hose coupling and reinstall plug and gasket.
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TOP COWL REMOVAL AND INSTALLATION

Removal
1
Unlock the rear latch by pushing lever down.
2
Lift rear of cowl and disengage front hook.
Installation
Engage the front hook and push cowl back over the cowl seal.
Push cowl down and move the rear latch lever up to lock.
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CORROSION CONTROL ANODE

Your outboard has a corrosion control anode (a) installed to the gear case. An
anode helps protect the outboard against galvanic corrosion by sacrificing its
metal to be slowly eroded instead of the outboard metals.
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The anode requires periodic inspection especially in salt water which will
accelerate the erosion. To maintain this corrosion protection, always replace
the anode before it is completely eroded. Never paint or apply a protective
coating on the anode as this will reduce effectiveness of the anode.
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EXTERIOR CARE

Your outboard is protected with a durable baked enamel finish. Clean and wax
often using marine cleaners and waxes.
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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. 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 signs
of fuel leakage.
Fuel Line Filter
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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
90-10102R30