Product Explanation; Use, Propulsion System, Etc - Yanmar 3YM20 Operation Manual

2. PRODUCT EXPLANATION

2. PRODUCT EXPLANATION

2.1 Use, Propulsion System, Etc.

The engine is equipped with a marine gear
or a sail drive unit. 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 displacement and structure of the hull
and use a propeller of the appropriate size.
As new boats are used, owners add addi-
tional equipment and completely fill the
fuel and water tanks adding to the overall
displacement (weight) of the vessel. Extra
canvas enclosures, bottom paint, and bot-
tom fouling can add additional hull resis-
tance. It is recommended that new vessels
be propped so the engines can operate at
100-200 rpm above rated rpm to allow for
some added weight and hull resistance.
Failure to do so can lead to reduced vessel
performance, lead to increased smoke lev-
els and cause permanent damage to your
engines.
The engine must be installed correctly with
safe cooling water and exhaust 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 op-
eration 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 knowl-
edge and engineering skills. Consult Yan-
mar's local subsidiary in your region or
your distributor or dealer.
NOTICE
This engine is designed for pleasure
boat applications.
The engine is designed to be operated
at:
Maximum throttle (3600-3800 rpm) for
less than 5% of total engine time. (30
minutes out of every 10 hours)
Cruising Speed (3400 rpm or lower) for
less than 90% of total engine time (9
hours out of every 10 hours)
WARNING
Never modify this product or release
the limit devices (which limit engine
speed, fuel injection quantity, etc.).
Modification will impair the safety and
performance of the product and func-
tions and shorten the product life.
Please note that any troubles arising
from modification of the product will
not be covered by our warranty.
EN
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