INSTALLATION MANUAL
90-864198020 Page 59 of 77
Cold Weather and Extended Storage
IMPORTANT: Mercury MerCruiser recommends that propylene glycol antifreeze (a
nontoxic and environmentally safe) antifreeze be used in the seawater section of the
cooling system for cold weather or extended storage. Ensure that the propylene gly-
col antifreeze contains a rust inhibitor and is recommended for use in marine en-
gines. Be certain to follow the propylene glycol manufacturer’s recommendations.
CAUTION
Seawater section of cooling system MUST BE COMPLETELY drained for winter
storage, or immediately after cold weather use, if the possibility of freezing temper-
atures exist. Failure to comply may result in trapped water causing freeze and/or
corrosion damage to engine. Damage caused by freezing is NOT covered by the
Mercury MerCruiser Limited Warranty.
Draining Instructions
CAUTION
Ensure that boat is out of the water or seacock is closed and bilge pump is operating
before beginning procedure. Excess water in bilge can damage engine or cause
boat to sink.
CAUTION
Do not operate engine with drain system open. Excess water in bilge can damage
engine or cause boat to sink.
IMPORTANT: Boat must be as level as possible to ensure complete draining of cool-
ing system.
Your power package is equipped with one of two drain systems. Refer to Identification on
the following page to determine which instructions apply to your power package.
The power package should be drained before flushing or prior to extended or cold weather
storage.
IMPORTANT: The boat must not be operating at any point during this procedure.
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