Section 4
4-2
460 Express Series
POWER TRAIN
Engines
Your yacht is powered by twin inboard engines. All operation,
specification and maintenance information is contained in the engine
owner’s manual. Find this manual, which is located in the Skipper’s
Kit, and familiarize yourself with it. The engine is the heart of your
yacht and following the manufacturer’s recommendations will provide
you with continued boating pleasure.
INBOARDS
The power generated by the engine is transmitted to the propeller via
the transmission, shaft coupling, and the propeller shaft assembly.
The propeller shaft is supported and aligned with the engine by a
throughhull shaft log and an outside strut.
COOLING SYSTEM
Each engine is cooled by seawater entering the yacht through a
seacock in the hull bottom. The water enters the engine through the
engine water jacket and is returned to the sea through the exhaust
system.
A feature which is standard on diesel engines is the fresh water
cooling system. This system uses the incoming seawater to cool a
secondary closed-cooling system. The seawater flows through an
engine mounted heat exchanger, cools the closed system coolant,
and is returned to the sea via the exhaust system.
ALARM SYSTEMS
Alarm systems are on all boats. The alarm will sound under the
following conditions:
• Engine temperature exceeds specified limits
• Engine oil pressure drops below specified limits
• Transmission oil temperature exceeds specified limits
• Ignition switches are ON, engines are OFF
To test the alarm system, turn the ignition switch to the ON position.
Depending upon the engine, the alarm may sound immediately, or
after a few seconds delay.
Engine Ignition Start/Stop - Keypad
Successfully entering the correct keyless code then pressing the
ENTER button will unlock the system. At this point the PORT ENGINE
IGN and STBD ENGINE IGN buttons are enabled. When the system
is unlocked, a 15 minute timer begins. If the system senses that either
or both engines are running or rotating during the 15 minute period,
the timer is reset and turned OFF. If neither engine starts during the
15 minute period, the system will lock. It will then be necessary to re-
enter the user code to unlock the system and enable starting the
engines.
With the system unlocked, pressing either ENGINE START button will
toggle the corresponding master engine ignition circuit ON, and the
corresponding indicator will light. The 15 minute counter is reset each
time one of the six buttons which control the engine ignition is
pressed. When the 15 minute time elapses and the tachometer inputs
are not detecting button activity or an engine running, the system will
automatically turn the master ignition circuits OFF and lock the
system.
If an ENGINE START indicator is ON the corresponding ENGINE
START button is enabled. The ENGINE START indicator will light
when the engine tachometer signal is sensed, indicating engine
CAUTION
The cooling system starts at the cooling water
seacock, which can be shut off for a number of
reasons. Make sure the seacocks are open before
starting engines. The absence of cooling water will
cause the engines to overheat and cause irreparable
damage.
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