Flushing The Cooling System - Mercury 25 EFI FourStroke User Manual

•
Replace the high pressure fuel filter.
•
Check engine timing setup.
• Check corrosion control anodes. Check more frequently
when used in saltwater. See Corrosion Control Anode.
• Drain and replace gear case lubricant. See Gearcase
Lubrication.
•
Lubricate splines on the driveshaft.
•
Check and adjust valve clearance, if necessary.
• Check power trim fluid. See Checking Power Trim Fluid.
• Inspect battery. See Battery Inspection.
•
Check control cable adjustments.
• Inspect timing belt. See Timing Belt Inspection.
• Check tightness of bolts, nuts, and other fasteners.
• Check cowl seals to make sure seals are intact and not
damaged.
• Check internal cowl sound reduction foam (if equipped) to
make sure foam is intact and not damaged.
• Check that the intake silencer (if equipped) is in place.
• Check that the idle relief muffler (if equipped) is in place.
• Check for loose hose clamps and rubber boots (if equipped)
on the air intake assembly.
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.
MAINTENANCE
1.
1.
96
1.
1.
1.
1.
eng