Flushing The Cooling System - Mercury 9.9 EH Manual

• Inspect and clean spark plugs. See Spark Plug Inspection and
Replacement.
• Check fuel line filter for contaminants. See Fuel System.
• Check carburetor adjustments, if required. See Carburetor
Adjustments.
• Check corrosion control anodes. Check more frequently when
used in saltwater. See Corrosion Control Anodes.
• Drain and replace gearcase lubricant. See Gearcase
Lubrication.
•
Lubricate splines on the driveshaft and shift shaft.
• Electric start models ‑ Inspect battery. See Battery
Inspection.
•
Remote control models ‑ Check control cable adjustments.
• Remove engine deposits with Mercury Precision or
Quicksilver Power Tune Engine Cleaner.
• Check tightness of bolts, nuts, and other fasteners.
• Clean fuel tank pick up filter.
EVERY 300 HOURS OF USE OR THREE YEARS
• Replace water pump impeller (more often if overheating
occurs or reduced water pressure is noted).
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.
Use a Mercury Precision or Quicksilver accessory (or equivalent)
flushing attachment.
1. These items should be serviced by an authorized dealer.
MAINTENANCE
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