Flushing The Cooling System - Mercury 75 OptiMax Owner's Manual

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EVERY 300 HOURS OF USE OR THREE YEARS
Replace water pump impeller (more often if overheating
occurs or reduced water pressure is noted).
Replace the in‑line oil filter that is located in the oil hose
between the oil tank and the oil injection pump.
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.
NOTE: The engine can be stopped, or running at idle speed in
neutral, when flushing the cooling system. Do not flush the
engine using a water source that exceeds 310 kPa (45 psi).
1. Unscrew the cover from the end of the hose adapter.
2. Attach a water hose to the hose adapter.
3. Turn on the water and flush the cooling system for a
minimum of 3 minutes.
IMPORTANT: Do not run engine above idle speed when
flushing.
MAINTENANCE
64
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