PRODUCT OVERVIEW
YANMAR JH4 FEATURES
AND APPLICATIONS
The JH4 series are four-stroke direct
injection diesel engines equipped with liquid
coolant systems.
The 3JH4E is 3-cylinder and naturally
aspirated.
The 4JH4AE is 4-cylinder and naturally
aspirated.
The 4JH4–TE is 4-cylinder and
turbocharged.
The 4JH4–HTE is 4-cylinder and
turbocharged with an intercooler.
The engines are equipped with a marine
gear or sail drive unit.
These engines are designed for pleasure
craft use.
It is recommended that new vessels be
propped so the engines can operate at 100
- 200 rpm above the fuel stop power rpm to
allow for some added weight and hull
resistance.
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
coolant lines, exhaust gas lines 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, always observe the instructions
and cautions given in the operation manuals
supplied by the shipyard and equipment
manufacturers.
The JH4 series engines are designed to be
operated at maximum throttle
(3000 - 3200 rpm) for less than 5% of total
engine time (30 minutes out of every 10
hours) and cruising speed (2800 rpm or
less) for less than 90% of total engine time
(9 hours out of every 10 hours).
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.
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.
JH4 Series Operation Manual 13
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