Section 6 - Storage
Page 136 90-8M0050539 eng MAY 2011
3. For additional assurance against freezing and rust, after draining, fill the cooling system with propylene glycol mixed to the
manufacturer's recommendation to protect engine to the lowest temperature to which it will be exposed during freezing
temperatures or extended storage
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturers instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Make sure 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.
Draining the Seawater System—350/377 MAG and SeaCore 350/377 MAG
Draining the Seawater System
!
CAUTION
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 seawater section of the closed cooling system.
IMPORTANT: The boat must be as level as possible to ensure complete draining of the cooling system.
Your power package is equipped with a drain system. Refer to Drain System Identification to determine which instructions apply
to your power package.
IMPORTANT: The engine must not be operating at any point during the draining procedure.
Drain System Identification
Air Actuated Single Point Drain System
Closed Cooled Models Seawater Cooled Models
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
6124
a
b
c
d
6125
a
b
c
d
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