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Section 6 - Storage
Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.
12. Fill the seawater cooling system with propylene glycol mixed to the manufacturer's recommendation to protect the engine
to the lowest temperature to which it will be exposed during freezing temperatures or extended storage. This will also
prevent the formation of exfoliating rust in the cooling system passages.
13. Store the battery according to the manufacturer's instructions.
TowSport and Inboard Transmissions Extended Storage
TowSport and Inboard power package transmissions require the fluid and applicable filter be replaced after 300 hours of
operation or once a year, whichever comes first. It is recommended before the power package will be stored for an extended
time, that the transmission fluid and applicable filter be replaced.
Draining the Seawater System
Draining the Raw Water
Water can enter the bilge when the drain system is open, damaging the engine or causing the boat to sink. Remove the boat
from the water or close the seacock, disconnect and plug the seawater inlet hose, and ensure the bilge pump is operational
before draining. Do not operate the engine with the drain system open.
IMPORTANT: Only drain the raw water section of the closed cooling system. Raw water is sometimes referred to as seawater.
IMPORTANT: The boat must be as level as possible to ensure complete draining of the cooling system.
IMPORTANT: The engine must not be operating at any point during the draining procedure.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the raw water section of the cooling system during freezing temperatures or for extended storage. Ensure that the propylene
glycol antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene
glycol manufacturer's recommendations.
Air Actuated Single‑Point Drain System (Closed Cooling, Inboard Models)
The following instructions apply to draining procedures performed on engines in vessels that are in the water. For vessels that
are not in the water, you do not need to close the seacock (if equipped) or remove and plug the water inlet hose.
1.
Close the seacock (if equipped) or remove and plug the water inlet hose.
2.
Remove the blue plug from the heat exchanger.
3.
Remove the cap from the air actuated valve assembly.
a
4.
Ensure that the lever on top of the air pump is flush with the handle (horizontal).
5.
Install the air pump on the actuator fitting.
Page 72
NOTICE
CAUTION
!
a -
Blue plug
b
b -
Cap
55099
90-8M0099741
JUNE 2015
eng
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