PRE-DELIVERY
6-6
ZT350 Installation Manual
Pre-Delivery Preparation
© 2007 Yanmar Marine International
Propeller Selection
The propeller converts the engine’s power into the
thrust needed to propel the vessel. Careful
selection of your propeller is very important to
proper vessel operation. Propellers are identified by
two numbers, such as 15.75 x 20 left-hand and
stainless steel propeller. In the number sequence,
the first number is the diameter of the propeller and
the second is the pitch. Left-hand is
counterclockwise rotation for front propeller.
Right-hand is clockwise rotation for rear propeller.
Pitch is the angle of the blades expressed in the
theoretical distance a propeller travels in each
revolution. If for example the pitch is 20, each
revolution of the propeller pushes the vessel 20 in.
through the water. A 28 pitch is considered “higher”
pitched and a 20 pitch propeller is considered
“lower” pitched. A smaller pitch propeller should be
selected for water skiing or for heavy loads.
Keep these guidelines in mind when selecting a
propeller:
•
NOTICE: NEVER attempt to change propellers
until after determining the average load and
individual requirements.
Your Yanmar dealer or
distributor is most qualified to help you select a
propeller.
• Engine rpm must be within the recommended
operating range. Refer to the
Engine Operator’s
Manual
.
WARNING! To prevent accidental start-up,
complete the following before installing or
removing the propeller:
◆
Put the remote control to the NEUTRAL
position.
◆
Put the main switch to OFF position and
remove the key.
WARNING! NEVER use your hand to hold the
propeller when loosening the nut. Put a wood
block between the antiventilation plate and the
propeller blade to prevent the propeller from
turning.
Problems associated with propellers include
ventilation, cavitation and blow-out. These
problems have similar symptoms and are best
diagnosed by an expert. If a propeller related
problem develops, see your Yanmar Marine dealer
or distributor.
Содержание ZT350 series
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