Scout Boats 221 Winyah, Owner'S Manual

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CAUTION
CAUTION
Galvanic corrosion is the corrosion process oc-
curring when different metals are submerged in
an electrolyte. Seawater is an electrolyte and
submerged engine components must be prop-
erly protected. Outboard motors are equipped
with sacrificial anodes to prevent galvanic corro -
sion problems. The anodes must be monitored
and replaced as necessary. For locations and
maintenance, please refer to the engine owner’s
manual.
When leaving the boat in the water, tilt the mo-
tors as high as possible. This will decrease the
risk of marine growth around the cooling inlets,
propeller and exhaust ports and damage from
galvanic corrosion.
DO NOT PAINT AN OUTBOARD MOTOR WITH ANTIFOULING
PAINTS DESIGNED FOR BOAT HULLS. MANY OF THESE PAINTS
CAN CAUSE SEVERE DAMAGE TO THE ENGINE. CONTACT
YOUR SCOUT DEALER OR ENGINE MANUFACTURER FOR
INFORMATION ON THE PROPER PAINTING PROCEDURES.
1.3 Engine Lubrication
4-cycle outboard engines incorporate a pressure-
type lubrication system with an oil sump in the
crankcase that must be kept full of the type and
grade of oil recommended by the engine manu-
facturer. It is normal for 4-cycle engines to con-
sume a small amount of oil. Therefore, the oil
must be checked before each use and changed
at regular intervals as instructed by the engine
owner’s manual.
Notice:
Always monitor the oil level in the crank-
case and only use the type of oil specified by
the engine manufacturer. Yamaha engines
specify Yamalube engine oil.
1.4 Engine Cooling System
Outboard engines are raw water (seawater)
cooled. Water is pumped through the water
inlets, circulated through the engine block, and
relinquished with the exhaust gases through the
propeller hub. The water pump uses a small
impeller made of synthetic rubber. The impeller
and water pump cannot run dry for more than a
few seconds. In most outboard motors, some
cooling water is diverted through ports below the
engine cowling. This allows the operator to visu-
ally check the operation of the cooling system.
When the engine is started, always check for a
steady stream of water coming out of those ports.
NEVER RUN AN OUTBOARD MOTOR WITHOUT WATER
FLOWING TO THE WATER PUMP. SERIOUS DAMAGE TO THE
WATER IMPELLER OR ENGINE COULD RESULT.
Notice:
If the boat is used in salt or badly polluted
water, the engines should be flushed after
each use. Refer to the engine owner’s man-
ual for the proper engine flushing procedure.
1.5 Propellers
The propellers convert the engine’s power into
thrust. They come in a variety of styles, diam-
eters and pitches. All boats powered by Yamaha
engines are equipped with Yamaha “Saltwater
Series” propellers. The one that will best suit the
needs of your boat will depend somewhat on your
application and expected average load. Propel -
ler sizes are identified by two numbers stamped
on the prop in sequence. The 1st number in the
sequence (example 14
”
x 21”) is the diameter of
the propeller, and the 2nd number is the pitch.
Pitch is the theoretical distance traveled by the
propeller in each revolution.
Always repair or replace a propeller immediately if
it has been damaged. A damaged and therefore
out of balance propeller can cause vibration that
can be felt in the boat and could damage the en-
gine gear assembly. Refer to the engine owner’s
manual for information on propeller removal and
installation.