Step 6
If the boat is equipped with a cockpit heater, be sure to
disconnect the hoses (heater circulation pump hose) and drain
any remaining water in the lines to avoid freezing. Even small
amounts of water in any of these areas can cause significant
damage upon freezing. Such damage is not covered under
warranty.
Be sure that disconnected hoses will not become entangled in the
engine belts when the engines turn over. Failure to do so may result
in damage to the engines and/or critical boat systems.
Step 7
You must winterize the engine flush fitting mounted to the
transom of the boat:
• Remove the boat from the water.
• Drain the engine according to the Ilmor or Mercury Engine
Owner’s Manual included with the Owner’s Manual
Information Packet.
Step 8
Winterize the non-potable water and blackwater holding tanks by
following the steps below:
1. Drain the potable water tank completely by opening all faucets
and flushing the head.
2. Once drained, pump out the blackwater waste holding tank.
3. If you plan to clean the holding tank, pour a mild cleaner or
warm, lightly soapy water into the toilet bowl and flush into
the tank. Pump the tank out again to completely empty the
waste tank.
4. Pour a minimum of five (5) gallons of propylene glycol based,
RV grade antifreeze into the freshwater non-potable tank, and
one (1) gallon of the same antifreeze into the toilet bowl.
5. Run all faucets including the transom shower (where equipped)
and flush the head until antifreeze can be seen coming out
of each sink and flushed into the toilet bowl. This will pull the
antifreeze through the plumbing system and through the sink.
NOTE: Never use automotive-type anti-freeze in the freshwater system.
NOTE: Where equipped, winterize the water heater system according
to the supplementary owner’s manual included in the owner’s manual
package with your boat.
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