2023 OWNER’S MANUAL
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388
MasterCraft engine, ballast, and freshwater system winterization.
Be aware that colder climates may require this same type of
antifreeze with a -100 F temperature rating.
TO WINTERIZE X, XT, AND PROSTAR MODELS:
1. Completely empty all ballast tanks and bags of any water that may
be in the ballast system.
2. Remove all ballast bags (if applicable) and re-attach the bridge
connector (pictured right) to the ballast thru hull vent hose and the
hose to the ballast hard tanks. Completely drain and store the bags
in a dry place.
3. With the rear ballast bags removed and the bridge connector in
place, identify the three ballast thru-hull vents (see guide to each
model in this Owner’s Manual. Most models have two vents on each
hull side toward the stern, and one vent forward of the helm on the
starboard side). The ProStar only has one optional hard tank ballast,
see guide to each model in this Owner’s Manual for the ProStar’s
vent location.
4. Add one gallon of -50 F RV type nontoxic propylene glycol based
antifreeze to each of the three thru-hull vents (the ProStar only has
one vent). Colder climates may require this same type of antifreeze
with a -100 F temperature rating.
5. Once the antifreeze is in all three ballast zones, use the manual
ballast override switches mounted on the dash to empty the tanks.
This will push antifreeze through the ballast system, across all
pumps, hoses, fittings and intake valves. Be cautious while using
the override switches as antifreeze will be pumped out of the
intakes mounted to the bottom of the boat.
Some models have check valves equipped on the ballast lines. On
such models pour a small amount of antifreeze into those vents (see
guide to each boat in this Owner’s Manual). The antifreeze will sit in
the line during storage.
TO WINTERIZE NXT SERIES BOATS:
1. Completely empty all ballast tanks and bags of any water that may
be in the ballast system.
2. Remove all ballast bags (if applicable) and re-attach the bridge
connector (pictured to the left) to the ballast thru hull vent hose and
the hose leading to the ballast hard tanks. Completely drain and store
the bags in a dry place.
3. With the rear ballast bags removed and the bridge connector in place,
identify the three ballast thru-hull vents on the hull sides of NXT
series boats.
To Ballast Pump Bridge Connector
To Thru-Hull Vent
Quick Connect
Fittings
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