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

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MAINTENANCE
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EMISSION CERTIFICATION LABEL
An emission certification label, showing emission levels and engine specifications
directly related to emissions, is placed on the engine at time of manufacture.
a
b
c
d
e
a.Idle Speed
b.Engine Horsepower
c. Piston Displacement
d.Date of Manufacture
e.Valve Clearance (if Applicable)
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OWNER RESPONSIBILITY
The owner/operator is required to have engine maintenance performed to
maintain emission levels within prescribed certification standards.
The owner/operator is not to modify the engine in any manner that would alter the
horsepower or allow emissions levels to exceed their predetermined factory
specifications.
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INSPECTION AND MAINTENANCE SCHEDULE

Before Each Use
1. Check engine oil level. (page 11)
2. Visually inspect the fuel system for deterioration or leaks.
3. Check outboard for tightness on transom.
4. Check propeller blades for damage.
After Each Use
1. Flush out the outboard cooling system if operating in salt or polluted water.
(page 15)
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 17)
2. Change engine oil. The oil should be changed more often when the engine is
operated under adverse conditions such as extended trolling. (page 17)
3. Replace spark plug at first 100 hours or first year. After that, inspect spark plug
every 100 hours or once yearly. Replace spark plug as needed. (page 16)
4. Drain and replace gear case lubricant. (page 17)
5. Check fuel line filter for contaminants. (page 16)
6. Check corrosion control anode. Check more frequently when used in salt
water. (page 15)
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 18)
∗ These items should be serviced by an authorized dealer.
90-10211R30
f
g
h
i
f. Family Number
g.Maximum Emission Output for
the Engine Family
h.Timing Specification
i. Recommended Spark Plug & Gap
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1-3
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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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b
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a
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