Flushing The Cooling System - Mercury 10 EFI FourStroke Installation, Operation & Maintenance Manual

• Check the outboard mounting fasteners that secure the outboard to the
boat transom. Tighten the fasteners to the specified torque—dealer
service.
• Check tightness of bolts, nuts, and other fasteners—dealer service.
• Check for loose hose clamps and rubber boots on the air intake assembly
—dealer service.
• Lubricate the driveshaft splines—dealer item
EVERY 300 HOURS OF USE OR THREE YEARS
• Lubricate the throttle and shift cable with oil—tiller handle models.
• Verify the throttle and shift cables are properly adjusted.
•
Check the power trim fluid. Refer to Checking Power Tilt Fluid.
• Lubricate all lubrication points. Lubricate more frequently when used in
saltwater. Refer to Lubrication Points.
• Replace the spark plugs. Refer to Spark Plug Inspection and
Replacement.
• Check the remote control cable adjustment, if applicable—dealer service.
• Inspect the timing belt—dealer service.
• Lubricate the splines on the upper driveshaft—dealer service.
• Check the wiring and connectors—dealer service.
•
Replace the water pump impeller—dealer service.
BEFORE PERIODS OF STORAGE
•
Refer to Storage section.

Flushing the Cooling System

Rotating propellers can cause serious injury or death. Never operate the boat
out of the water with a propeller installed. Before installing or removing a
propeller, place the drive unit in neutral and engage the lanyard stop switch
to prevent the engine from starting. Place a block of wood between the
propeller blade and the anti‑ventilation plate.
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.
IMPORTANT: The engine must be run during flushing in order to open the
thermostat and circulate water through the water passages.
1. Remove the propeller. Refer to Propeller Replacement.
1. Replace the water pump impeller more often if overheating occurs or reduced water pressure is noted.
eng
MAINTENANCE
WARNING
!
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1.