Section 5 - Storage
Page 72 90-8M0113857 eng DECEMBER 2015
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.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or 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.
Drain System Identification
NOTE: All drain plugs are fitted with blue wing nuts.
Air Actuated Single-Point Drain System
NOTE: The blue air pump is mounted on the engine on V8 models, but is stored off the engine on V6 models. Ask your dealer
for the location.
Closed cooling models (V8 shown)
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
Seawater cooled models—Non-catalyst shown, catalyzed
similar
a - Blue drain plug location
b - Air manifold
c - Green indicators
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