3. Loosen the closed cooling heat exchanger drain screw approximately two turns, and allow the contents to drain into an
appropriate container.
a - Closed‑cooling system drain screw
b - Seawater system drain screw
4. If required, clean the closed‑cooling system. See your Mercury Diesel authorized repair facility.
5.
Fill the system with the specified coolant. Refer to Filling the Closed‑Cooling System.
Filling the Closed‑Cooling System
IMPORTANT: Use only the specified coolant.
Description
Capacity Part Number
Extended Life Antifreeze/Coolant 9.0 Liter (9.5 US qt) 92‑877770K1
1. Verify that the closed‑cooling heat exchanger drain screw is tight.
2. Remove the pressure cap from the expansion tank coolant reservoir.
a - Pressure cap
b - Maximum mark
c - Minimum mark
3. Slowly add the coolant to the expansion tank. Allow the entrapped air to escape.
4. When coolant cannot be added, supply the seawater pump with water.
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
5. Do not install the pressure cap. Start and operate the engine at idle for approximately two minutes.
6. Add coolant if necessary to maintain the coolant at the specified level on the expansion tank.
7. Allow the engine to warm up,
8. Add coolant if necessary to maintain the coolant at the specified level on the expansion tank.
Section 4 - Maintenance
90-8M0145546 eng MAY 2018 Page 55
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