DEHLER 31/34
ENGINE (continued)
ship's inventory for lubricating the stern gear, also for cable linkages to throttle and
gear box etc. The propellor shaft outer bearing is usually a rubber composition cutless
bearing which is water lubricated. This can be checked once a year (more frequently
in shallow mud or sandy waters) and replaced, if necessary.
When starting the engine ensure that the combined single lever throttle gear change
is in neutral and set as recommended by the engine manufacturer. As soon as the engine
has started, throttle back to a fast tick-over and ensure that a good flow of cooling water
passes through the exhaust system which can be observed from the exhaust outlet at the
transom. A noisy exhaust indicates a restriction in engine cooling water.
In general terms it is recommended that the engine runs between half and three-quarter
throttle. This will give you good boat speed and economical fuel consumption. If the
engine is allowed to labour under load this can quickly be seen by the emission of black
oily smoke from the exhaust outlet.
A folding geared propellor is usually fitted and may stick if the yacht is out of use and
afloat for some length of time. Always check that the propellor blades open freely by
checking the installation in gear prior to leaving your mooring. Scrubbing and regular
inspection will ensure reliable operation. If a non geared propellor blade is fitted and
sticks in the feathering position when the engine is put into gear a very harsh vibration
will immediately be felt. Throw the engine out of gear IMDIATELY and check the
propellor. A propellor running out of balance for any reason will quickly damage the
stern gear and most certainly fracture a "P" bracket, if fitted. A zinc waster is fitted
to the propellor shaft adjacent to the "P" bracket and this should be inspected and changed
at regular intervals depending upon where the yacht is located.
FUEL TANK
The fuel tank is vented to atmosphere and is fitted from a deck filler marked "FUEL", a
little vaseljne wiped around the threads of the fuel filler will ensure a watertight joint.
Fuel contents gauges are sometimes fitted. When laying the yacht up, especially during
the Winter months, always fill the fuel tank as this will reduce condensation.
ELECTRICAL SYSTEM
A one or two battery 12 volt D. C. system is employed to service the general electrics
throughout the yacht. The second battery, when fitted, is wired for engine start only.
The battery (batteries) is charged by the engine driven alternator or through a shore
line which can be fitted as an extra. The shore line brings 220/240 volts A. C. current
converting to 12 volt D. C. for charging the batteries with the addition of an A. C. socket.
NEVER TURN OFF THE BATTERY ISOLATION SWITCH (OR ENGINE IGNITION
SWITCH) WHEN THE ENGINE IS RUNNING AS THIS WILL IMr'VIDIATELY DAMAGE
THE ALTERNATOR AND REGULATOR SYSTEMS.
'ihe battery isolation switching when turned on immediately energises the electrical
system throughout the yacht, i.e. engine start, general lighting, etc.
A
fuse box or
circuit breakers are provided for protection with Individual switching to navigation
lights, steaming light, night illumination of instruments, compasses etc,etc. A
socket is also provided into which a powerful light/signalling lamp (ship's scarer)
PAGE 14
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