Propulsion Systems
1-3
Section 1
OS 385
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.
Summary of Contents for OS 345
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Page 4: ...Operator Notes OS 375...
Page 16: ...12 Operator Notes OS 385...
Page 32: ...3 6 Operator Notes OS 385...
Page 34: ...4 2 Section 4 Electrical System OS 385 Main Distribution Panel MDP...
Page 54: ...5 8 Operator Notes OS 385...
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Page 104: ...A 6 Operator Notes OS 385...
Page 106: ...B 2 Appendix B Maintenance Log OS 385 Date Hours Dealer Service Repairs Maintenance Log...
Page 107: ...Maintenance Log B 3 Appendix B OS 385 Date Hours Dealer Service Repairs...
Page 108: ...B 4 Appendix B Maintenance Log OS 385 Date Hours Dealer Service Repairs...
Page 109: ...Boating Accident Report C 1 Appendix C OS 385 Boating Accident Report...
Page 110: ...C 2 Appendix C Boating Accident Report OS 385...
Page 111: ...Float Plan D 1 Appendix D OS 385 Float Plan...
Page 112: ...D 2 Operator Notes OS 385...
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Page 117: ...Schematics F 1 Appendix F OS 385 Schematics...
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