PURSUIT OS 285 Owner's Manual download pdf (Page 20)

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Section 1 Propulsion Systems

OS 285

2-Cycle Engines

An oil injection system lubricates 2-cycle

engines. Check the engine oil level before

each use by checking the gauge in the helm

or visually checking the oil level using the

reference marks on the tanks. Use only the

type of oil specified by the engine manufac-

turer to maintain proper oil level.

Refer to the engine owner’s manual for oil

specifications and additional information on

the oil injection system. Refer to the Fuel

System chapter.

1.4 Engine Cooling System

Raw water (seawater) cools outboard

engines. Water inlets allow the coolant water

pump to circulate cooling water through the

engine block. Used coolant water releases

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 without damage occurring. In most

outboard motors, some cooling water diverts

through ports below the engine cowling. This

allows visual inspection of the cooling sys-

tem. With the engine running, always check

for a steady stream of water coming out of

these ports.

If using the boat in salt or badly polluted

water, flush the engines after each use.

Refer to the engine owner’s manual for the

proper engine flushing procedure.

1.5 Propellers

Propellers convert the engine’s power into

thrust. They come in a variety of styles,

diameters and pitches. The one that will best

suit the needs of your Pursuit will depend

somewhat on your application and expected

load average.

Two numbers stamped on the prop in

sequence identify propeller sizes. The 1

st

number in the sequence (for example 14 x

21) is the diameter of the propeller, and the

2

nd

number is the pitch.

The theoretical distance traveled by the pro-

peller for each revolution is the pitch.

Always repair or replace a propeller immedi-

ately if damaged. A damaged, therefore out

of balance propeller, can cause a noticeable

vibration in the boat and can damage the

engine gear assembly. Refer to the engine

owner’s manual for information on propeller

removal, repair or replacement instructions.

1.6 Engine Instrumentation

The helm station is equipped with a set of

engine instruments and alarms. Instruments

allow the operator to monitor the engines’

operational conditions. Close observation of

these instruments allows the operator to use

the engines efficiently and can prevent

costly damages. The instrumentation is

unique to the type of outboard motors

installed on your Pursuit. Some or all of the

following gauges may be present.

This model may be equipped with

Yamaha Command Link Integrated

Information System®. Please refer to

Yamaha owner’s manuals for information

on system operation.

! WARNING

Always monitor the oil level and only

use the type of oil specified by the

engine manufacturer.

! CAUTION

Never run an outboard motor without

water flowing to the water pump. Seri-

ous damage to the water impeller or

engine can occur.

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