Malibu Boats 21 VLX, Owner'S Manual

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2020 Malibu Boats LLC • Owner’s Manual • Page 259
boat out of neutral gear.
• After approximately two (2) to three (3) minutes of flushing, shut off the engine.
• Turn off the freshwater supply.
• Disconnect the hose and reinstall the cap on the flush kit connector.
Winterizing procedure:
After flushing the engine, remove the
T-handle drain plug in the bilge compartment,
and the engine drain plugs located on the
V-drive under the coupler, bottom of the heat
exchanger, and both manifolds.
All drain plugs should be placed in a plastic
bag and stored in a visible location so when
recommissioning the boat, the plugs will not be
overlooked.
• After flushing with fresh water, open all drain
cocks. Depending upon the model, there may
be several.
• When the water has fully drained, close the drain cocks and tape shut the water inlet on the bottom of the
boat. Use low-tack type of tape to avoid damaging the finishes on the inlet and surrounding metal and gel
coat. The water pick-up does NOT need to be taped.
• With the boat shifter in neutral, start the engine and allow it to idle. During the entire process, DO NOT
EXCEED 1100 RPM on the engine. (The freshwater hose cannot provide sufficient water supply to adequately
cool the engine at higher RPMs.) Also, never take the boat out of neutral gear.
•
DO NOT RUN THE ENGINE FOR MORE THAN 10 SECONDS!
This procedure allows any remaining water in
the system to be forced out.
Allowing the engine to run more than 10 seconds could cause permanent
damage from engine overheating. Such damage is not covered under
warranty!
• Remove the tape from the raw water intake, and the garden hose from the valve.
Winterizing with the Boat In Water:
• After the flushing process is complete, remove the adapter from the flush pump cap strap and insert the
adapter into the flush pump valve.
• Using a piece of gardening-type hose, place the male end of the hose into the flush kit fitting and place the
other end into a container of the marine-grade, 50/50 mix of distilled water and propylene glycol coolant, if
not using a pre-mix of the same.
• Open all petcocks and drain the engine block and water-cooled manifolds. If the petcocks are plugged,
carefully unclog the openings. When all the water has drained out, close all pet cocks and replace any plugs
that were removed.
• Start the engine and the pump will automatically pump the coolant from the bucket into the engine and
manifolds.
DO NOT EXCEED 1100 RPM
.
• When the bucket is empty, IMMEDIATELY shut down the engine.