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Mercury 540 Bravo - Maintenance: Coolant Level and Filling; Checking Coolant Level; Filling the Closed Cooling System

Mercury 540 Bravo
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NOTE: All factory‑installed closed cooling systems come filled with Extended
Life Coolant. This antifreeze requires draining and replacing every five years or
1000 hours of operation, whichever comes first. The color of this antifreeze is
orange. Any "top‑off" fluid used must be Extended Life Coolant.
Tube Ref
No.
Description Where Used Part No.
122
Extended Life
Antifreeze/Coolant
Closed cooling system 92-877770K1
CHECKING COOLANT LEVEL
!
CAUTION
A sudden loss of pressure can cause hot coolant to boil and discharge
violently resulting in serious injury from burns. Allow the engine to cool down
before removing the coolant pressure cap.
IMPORTANT: When reinstalling the coolant reservoir cap, ensure that it is
tightened securely.
The coolant level should be at the full mark on the coolant reservoir with the
engine cold.
53510
FILLING THE CLOSED COOLING SYSTEM
IMPORTANT: The engine must be cooled to ambient temperature to correctly
perform the following procedure.
MAINTENANCE
eng 55

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