Before Each Use
(Prior to Starting the Engine)
Review the Safety Checks and Services section of this Owner’s Man-
ual. There are important functions that must be followed before, during
and after every outing, without fail! The
Safety Checks and Services notes
that all drain plugs must be reinstalled prior to operating the boat!
Inspect
Seacock Strainer
(where equipped)
Because a clogged seacock
strainer puts undue strain on the
engine(s), the strainer should be
checked prior to starting the boat.
Boats with closed cooling systems
are not equipped with this. The sea-
cock strainer is standard on boats
built for operation in salt water.
Step 1: Remove the plastic wing
nut on top of the strainer. Lift the
cover.
Step 2: Remove the lter and
inspect for debris. Manually clean
the strainer.
Step 3: Return the lter in place
and recover. Tighten the wing nut,
but do not over-tighten as it may
eventually strip the threads hold
-
ing the wing nut in place.
Inspect the Battery
Connections
and Hold-Downs
Because poor connections or hold-
downs may result in erroneous
voltmeter readings, MasterCraft
recommends doing this before
starting the boat.
Step 1: Ensure the engine is OFF and the engine safety starting
switch disconnected. Be certain that the throttle/shift
control lever is in neutral. Locate the battery. Batteries
are placed in a variety of locations, depending on the model.
Check under the observer seat or behind the rear seat.
Step 2: Check that the battery post connections are clean and tight.
If not:
• Loosen and remove the negative terminal connection rst. Be
careful not to touch the positive terminal with the wrench.
• Loosen and remove the positive terminal connection.
• Remove the battery hold-downs and remove the battery from the
boat.
• Clean corrosion from the battery posts with a battery terminal
cleaner.
• Clean the battery with a water-and-baking-soda solution. Use care
to avoid allowing the solution to enter the battery vents. Rinse the
battery with fresh water.
sche d ule d mai nte na n ce
Battery electrolyte fluid is dangerous. It contains sul-
furic acid, which is poisonous, corrosive and caustic.
If electrolyte fluid is spilled or placed on any part
of the human body, immediately flush the area with
large amounts of clean water and immediately seek
medical attention.
• Use a battery terminal cleaning brush to remove corrosion from
the inside of the battery terminals. Clean the terminals with a wa-
ter-and-baking-soda solution and rinse with fresh water.
• Check the battery box that normally holds the battery in place
to determine whether there is evidence of battery uid inside
it. Battery uids are corrosive and can cause permanent damage
to the battery box. If uid is evident, wash out the box with the
water-and-baking-soda solution that is used in cleaning the termi-
nals. Rinse with fresh water and dry with a cloth.
• Reconnect the positive terminal rst, then the negative. Tighten the
terminals. Coat both terminals completely with a thin covering of
marine grease. Be sure that the rubber boot covers the positive
terminal completely.
Note: The boat’s engine is designed to work with the
standard electronics installed in the boat. Adding other elec-
trical components or accessories can change the way the fuel
injection controls the engine or the overall electrical system
functions. Before adding electrical equipment, consult an
authorized MasterCraft dealer’s service department. Other-
wise, the engine may not perform properly.
Add-on equipment may adversely affect the alternator
output or overload the electrical system. Such damage
may not be covered by the warranty.
If a replacement battery is required, be certain to select a marine
battery with at least seven-hundred-fty (750) cold-cranking-amps at
zero degrees (0
o
) Fahrenheit. Before disconnecting the battery, make
sure the ignition key and all accessories are in the OFF position. Also
remember to re-attach the cables in the proper order, with the nega-
tive cable connected to the negative [-] post and the positive cable
connected to the positive [+] post.
When charging, batteries generate small amounts of dan-
gerous hydrogen gas. is gas is highly explosive. Keep all
sparks, flames and smoking well away from the area. Fail-
ure to follow instructions when charging a battery may
cause an electrical charge or even an explosion of the bat-
tery, which could result in death or serious injury.
mastercraft 2010 ow n e r ’s m anual • page 17-1
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