PRODUCT OVERVIEW
YANMAR BY-SERIES
FEATURES AND
APPLICATIONS
The BY-series engines are in-line 4- and
6-cylinder direct injection diesel engines.
The engines are turbocharged and
equipped with a liquid cooling system.
These engines are designed for pleasure
craft use.
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 can
operate at 100 rpm above maximum rpm to
allow for some added weight and hull
resistance. Failure to do so can lead to
reduced vessel performance, 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 on-board 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 pleasure boat
applications. The engine is designed to be
operated at: maximum throttle 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 - 3300
rpm) for less than 90% of its total operation
time (9 hours out of every 10 hours).
BY Series Operation Manual
9
© 2008 Yanmar Marine International
