520 Express Series
5-5
Propellers
CAUTION
Propellers can be very sharp. Be
careful when you handle them. Wear
protective gloves when handling
any propeller. Remove the key from
the ignition switch and remove the
Emergency Stop Switch Clip, if you
yacht is equipped with stop
switches, to prevent accidental
starting of the engines. Do not use
damaged propellers. Damaged
propellers can damage your engine
and boat.
The propellers installed on your yacht were
selected because their diameter and pitch
provide the optimum speed and
performance under average conditions of
load. Propeller selection must be based on
the ability of the engine to turn the propeller
and achieve the manufacturer’s
recommended RPM at full throttle.
NOTE
Variations from average loadings, bottom
condition and/or engine condition could
call for a propeller change to achieve the
performance desired.
SELECTING A PROPELLER
CAUTION
Improper propeller selection and
installation could result in loss of
the propeller, and/or excessive
stresses on the power train leading
to power train failure. Cruisers
Yachts recommends that you
consult with and employ the skills
of your Cruiser Yachts Dealer when
contemplating a change.
First,
ensure that the diameter and pitch
provide the performance desired. The
engine RPM at full throttle should be in the
upper half of the recommended full throttle
operating range. If RPMs are low, a
propeller with a smaller pitch will increase
RPMs. If RPMs are high, a propeller with an
increased pitch will lower RPMs.
Second,
ensure that the propeller rotation is
consistent with engine and gear box
rotation. Your yacht is designed with
counterrotating inboards for minimum torque
effects.
Third,
ensure that the installation provides
adequate safety features such as a straight
key, a propeller nut, a jam nut and a cotter
pin. Refer to GENERAL MAINTENANCE in
Section 8
for installation instructions.
FUEL SYSTEM (Crossover
Valve)
Your yacht is equipped with an internal fuel
system meeting current federal
requirements. The best materials and
components available are used to assemble
the fuel system.
The fuel tank outlets to the engines have a
manual valve for fuel shut-off in the event of
a line break. To access the manual valves or
tank fittings, open the fuel access hatch. The
valves are on the top of the fuel tank. These
valves are attached to the fuel tank outlet
and return lines. The valves are closed when
the handle is perpendicular to the fuel line,
and open when the handle is in-line with the
fuel line.
There are also crossover valves between
the tanks located at the top of the fuel tanks
under the fuel access hatch.
Fuel fill caps are located on starboard deck
walk-around of the yacht. Near the fill cap is
a vent which allows air to move in and out of
the tank as the fuel level changes. The fill for
the starboard tank is forward and the port fill
is aft.
The manual valves can control the fuel
supply to the engines in five ways:
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