PURSUIT OS 315 Owner's Manual download pdf (Page 18)

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Section 1 Propulsion Systems

OS 315

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.

1.5 Propellers

The propellers convert the power of the

engines into thrust. Propellers vary in style,

diameters and pitch. The best set for your

needs will depend on your application and

expected average load. Propeller sizes are

identified by two numbers stamped on the

prop in sequence; the first is the diameter

and the second is the pitch (example 14 x

21). Pitch is the theoretical distance the pro-

peller will travel in one rotation. Repair or

replace a propeller immediately if it has been

damaged. A damaged propeller can cause

! 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.

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