Flushing The Cooling System - Mercury 200 OptiMax DTS Manual

•
Lubricate splines on the driveshaft and shift shaft.
• 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).
• Inspect the poppet valve assembly for deterioration of the
rubber diaphragm. Replace the rubber diaphragm if
necessary.
• Replace the two in‑line oil filters located in the air
compressor oil return lines.
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: Engine can be stopped, or running at idle speed, when
flushing the cooling system. Do not flush engine using a water
system that exceeds 310.26 kPa (45 psi).
1. Remove the plug from fitting in the bottom cowl.
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