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Mercury Outboard Maintenance Schedule

 

MAINTENANCE

• Visually check steering link rod fasteners for proper tightness.

• Check propeller blades for damage.

AFTER EACH USE

• Flush out the outboard cooling system if operating in salt or polluted water.

• Wash off all salt deposits and flush out the exhaust outlet of the

propeller and gearcase with fresh water if operating in salt water.

EVERY 100 HOURS OF USE OR ONCE YEARLY,

WHICHEVER OCCURS FIRST

• Lubricate all lubrication points. Lubricate more frequently when used in salt water.
• Replace spark plugs at first 100 hours or first year. After that, inspect

spark plugs every 100 hours or once yearly. Replace spark plugs as needed.
• Replace fuel filter.

• Replace compressor air intake filter.

• Inspect alternator belt.

• Check corrosion control anodes. Check more frequently when used in salt water.

• Drain and replace gearcase lubricant.

• Check power trim fluid.

• Inspect battery.
• Check control cable adjustments.1.

• Lubricate splines on the driveshaft and shift shaft.1.

• Check tightness of bolts, nuts, and other fasteners.

EVERY 300 HOURS OF USE OR THREE YEARS

• Replace water pump impeller
(more often if overheating occurs or reduced water pressure is noted).1.


BEFORE PERIODS OF STORAGE

• Refer to Storage procedure. See Storage section.

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.

1. These items should be serviced by an authorized dealer.