Mercury 250 Specifications download pdf (Page 64)

MAINTENANCE

•

Check control cable adjustments.

• Check tightness of bolts, nuts, and other fasteners.

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.

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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2. Attach a water hose to the fitting. Turn on the water and flush

for 3 to 5 minutes.

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Mercury 250 Specifications Page 64