PRODUCT OVERVIEW
YANMAR 6LY3 FEATURES
AND APPLICATIONS
The engine is equipped with a marine gear.
The marine gear output shaft connects with
the propeller shaft. In order to obtain full
performance from your engine, it is
imperative that you check the size and
structure of the hull and use a propeller of
the appropriate size. As new boats are used,
owners add additional equipment and
completely fill the fuel and water tanks,
adding to the overall displacement (weight)
of the vessel. Extra canvas enclosures,
bottom paint and bottom fouling can add
additional hull resistance. It is
recommended that a new vessel be
propped so the engine operates at 95% load
at 3300 rpm. Failure to do so can lead to
reduced vessel performance, lead to
increased smoke levels and cause
permanent damage to your engine.
The engine must be installed correctly with
the seawater or cooling water piping,
exhaust gas piping and electrical wiring. Any
auxiliary equipment attached to the engine
should be easy to use and accessible for
service. To handle the drive equipment,
propulsion systems (including the propeller)
and other onboard equipment, be sure to
observe the instructions and cautions given
in the operation manuals supplied by the
shipyard and equipment manufacturers.
The laws of some countries may require hull
and engine inspections, depending on the
use, size and cruising area of the boat. The
installation, fitting and surveying of this
engine all require specialized knowledge
and engineering skills. See Yanmar’s local
subsidiary in your region or your authorized
Yanmar Marine dealer or distributor.
This engine is designed for light duty
commercial applications. The engine is
designed to be operated at maximum
throttle (3300 rpm) for less than 5% of its
total operation time (30 minutes out of every
10 hours). The engine should be operated
at cruising speed (3200 rpm) for less than
90% of its total operation time (9 hours out
of every 10 hours).
New Engine Break-In
As with all reciprocating engines, the way
your engine is operated during its first 50
hours of operation plays a very significant
role in determining how long it will last and
how well the engine will perform over its
lifetime.
A new Yanmar diesel engine must be
operated at suitable speeds and power
settings during the break-in period to make
the sliding parts, such as piston rings, break
in properly and to stabilize engine
combustion.
During the break-in period, the engine
coolant temperature gauge should be
monitored; temperature should be between
71 and 87C (160 and 190F).
6LY3 LDC Operation Manual
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© 2008 Yanmar Marine International