Flushing The Cooling System - Mercury 4C Instruction Manual

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.
IMPORTANT: Before flushing, remove the propeller.
IMPORTANT: Never start or operate the engine indoors or in any
space which is not well ventilated. Exhaust gas contains carbon
monoxide, a colorless and orderless gas which can be fatal if
inhaled for any length of time.
Use a Mercury Precision or Quicksilver accessory (or equivalent)
flushing attachment.
NOTE: Do not run the engine while flushing the cooling system.
1. Remove the water plug from the motor, and screw in the
flushing attachment (hose adapter).
2. Attach a hose to the flushing attachment.
3. With the shift lever in Neutral (N), run the engine at a low
speed while flushing the cooling system to ensure all sea
water and mud are removed.
a
MAINTENANCE
41068
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a - Flushing attachment
eng