2005
MASTERCRAFT
OWNERS
MANUAL
–
PAGE
18-2
Step 4: Carefully loosen the flame arrestor and lift it far enough
to insert the tube of the fogging oil can. Spray four to six (4 to
6) ounces of oil into the throat of the carburetor or throttle
body. Shut off the engine. Re-attach the flame arrestor and
seal with low-tack tape.
Step 5: Perform the annual maintenance as described in the
previous chapter.
Step 6: Loosen all accessory drive belts and check their
condition.
ALL
ENGINES
Step 1: Drain water from the exhaust manifolds. Uncouple
the hose quick-disconnect and drain the manifolds. A small
brass screw-in plug located on the manifolds must also be
removed. The engine manufacturer recommends leaving the
drain plugs out or the hose uncoupled until the boat is placed
back in service.
Step 2: Remove both hoses from the raw water pump on the
front of the engine. Drain any remaining water from the hoses.
Step 3: Remove the raw water pump impeller from the pump
housing. If the impeller shows any signs of damage or wear,
discard it. If it can be re-used, lubricate the impeller with Vasoline
or soap and seal in an airtight bag.
Note: It is extremely important to pay attention to the
impeller during use. At any sign of wear, replace it. If you
have used a single impeller throughout the season, replace
it. Be certain that when the boat is placed in service the
following season that you have an impeller in the raw water
pump! Failure to follow these guidelines may result in nulli-
fying your warranty!
Step 4: Remove the
hose from the lower
end of the transmis-
sion cooler. Inspect
the cooler for any de-
bris such as weeds,
plastic pieces, etc.
RAW
WATER-
COOLED
EN-
GINES
Step 1: Remove the drain plug on the port side and knock
sensor from the starboard side of the engine to allow for the
remainder of the water draining function.
Notice: Some 5.7 Liter engines have a knock sensor lo-
cated in the drain location. The knock sensor must be care-
fully removed to drain that side of the block. Also, on the
8.1 Liter engine, removing the knock sensor
does NOT drain the block. Remove the plugs
from the brass fillings on both sides of the
engine to drain water from the block.
Note: Placing the drain plugs in a plastic
bag and attaching it to the steering wheel of
the boat will act as a reminder to reinstall the
drain plugs during recommissioning in the
spring.
Step 2: Use a short piece of stiff wire to dis-
lodge any rust or scale that may be around the
drain hole.
Step 3: Disconnect the large diameter hose
that runs from the water circulating pump to
the thermostat housing.
Make sure all of the water drains from the hose.
FRESH
WATER-COOLED
ENGINES
Step 1: Remove the raw-water inlet and outlet
hoses from the intake side of the heat exchanger.
Step 2: Check the level of the coolant on the fresh water side
of the heat exchanger. Use the anti-freeze tester to test the
strength of the mixture.
Notice: A special anti-freeze tester designed to be used
with propylene glycol anti-freeze is required to test the
strength of the mixture.
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