Owner`s manual

1-2
Section 1 Propulsion Systems
OS 385
1.3 Engine Lubrication
4-cycle engines have an oil sump in the
crankcase. The oil type, grade and level
must be followed in accordance with the
engine manufacturer’s recommendation. It is
normal for 4-cycle engines to consume a
small amount of oil. Check the oil level
before each use and change it following the
engine manufacturer’s recommendation.
2-cycle outboard engines are lubricated by
an oil injection system. Check the oil level
before each use and use only type specified
by the engine manufacturer. Also monitor
the oil level by checking the gauge in the
helm or visually checking the oil level in the
tank by using the reference marks on the
tanks. Refer to the engine owner’s manual
for oil specifications and additional informa-
tion on the oil injection system. Refer to the
Fuel System Section.
1.4 Engine Cooling System
Outboard engines are raw water (sea water)
cooled. Water is pumped through the water
inlets, circulated through the engine block,
and expelled with the exhaust through
exhaust port, water port and 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 engines,
some cooling water is diverted through ports
below the engine cowling. This allows the
operator to visually check the operation of
the cooling system. When the engine is
started, make sure a steady stream of water
is present.
If the boat is used in salt or badly polluted
water, flush the engines after each use to
reduce corrosion. Refer to the engine
owner’s manual for the proper engine flush-
ing procedure.
! CAUTION
DO NOT use copper-based coatings or
any coatings not approved for use
with aluminum. Some paint manufac-
turers claim their paints are safe for
aluminum. Copper components and
copper-based paints can cause severe
corrosion to aluminum. DO NOT use
copper-based paints.
Mercury or mer-
cury-based compounds that come
into contact with aluminum will result
in severe corrosion.
! NOTICE
Use only the oil recommended by the
engine manufacturer, and monitor the
oil level. Use of any other type of oil
can cause the engine to malfunction
or severe damage.
! CAUTION
DO NOT operate an engine out of the
water, even momentarily. Water must
be supplied to the cooling system of
the power head and water pump, or
serious damage will result. If it is nec-
essary to run the engine out of the
water, connect it to a engine flush
attachment design for your specific
engine.