PURSUIT OS 375 Owner's Manual download pdf (Page 19)

Propulsion Systems

1-3

Section 1

OS 375

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

vibration that can be felt in the boat and can

damage the engine gear case. Refer to the

engine owner’s manual for information on

propeller removal and installation.

1.6 Engine Instrumentation

The helm station is equipped with a set of

engine instruments and alarms. The instru-

ments allow the operator to monitor the

operational conditions of the engines. Moni-

toring the instrumentation allows the opera-

tor to operate the engines most efficiently

and prevent serious costly damage. The

instrumentation is unique to the type of out-

board engines installed on your Pursuit.

Your boat may not be equipped with all of

the following gauges.

Some models may be equipped with

Yamaha Command Link Integrated Infor-

mation System®. Refer to the Yamaha

manuals for information on the operation

of this system.

Tachometer

The tachometer displays the speed of the

engine in revolutions per minute (RPM). This

speed is not the boat speed or the speed of

the propeller. The tachometer may not regis-

ter zero with the key in the “OFF” position.

Speedometer

The speedometer indicates the speed of the

boat in miles per hour (MPH). Most speed-

ometers measure the water pressure

against a small hole in a pick-up tube

located in the engine lower unit or from GPS

in a Yamaha® installation.

Temperature Warning

The temperature warning indicates the tem-

perature of the engine. A sudden increase in

the temperature could indicate an obstructed

water inlet or an impeller failure.

Fuel Gauge

The fuel gauge indicates the approximate

fuel level in the fuel tanks. This gauge is a

relative indication of the fuel supply avail-

able; it is not a calibrated instrument. On

Yamaha equipped boats, fuel level is dis-

played in the speedometer. The center fuel

tank is read from the separate fuel gauge to

the right of the instrument panel.

! NOTICE

DO NOT exceed maximum recom-

mended engine RPM. Exceeding,

maintaining or close to maintaining

maximum can reduce engine life.

! NOTICE

Continued operation of an overheated

engine will cause severe engine dam-

age. If the engine overheats, shut off

the engine, investigate the problem

and correct it.

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