Yanmar 3JH4BE, 3JH4E, 3JH4CE, 3JH4ME, 4JH4E Service Manual
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M9961-03E091
Printed in Japan
M9961-03E091
Publication No. M9961-03E091
History of Revision
Manual Name Service Manual for Marine Diesel Engine
Engine Model: 3JH4(B)(C)(M)E / 4JH4(F)(B)(B4)(C)(M)E
Number
of
revision
Date of
revision
Reason for
correction
Outline of correction
Correction item
No (page)
Corrected
by
New edition February 2004
FOREWORD
This service manual has been compiled for engineers engaged in sales, service, inspection and
maintenance. Accordingly, descriptions of the construction and functions of the engine are emphasized
in this manual, while items, which should already be common knowledge, are omitted.
One characteristic of a marine diesel engine is that its performance in a vessel is governed by the
applicability of the vessel's hull construction and its steering system.
Engine installation, fitting out and propeller selection have a substantial effect on the performance of the
engine and the vessel. Moreover, when the engine runs unevenly or when trouble occurs, it is essential
to check a wide range of operating conditions - such as installation to the full and suitability of the ship's
piping and propeller - and not just the engine itself. To get maximum performance from this engine, you
should completely understand its functions, construction and capabilities, as well as proper use and
servicing.
Use this manual as a handy reference in daily inspection and maintenance, and as a text for engineering
guidance.
Model 3JH4E has been used for the illustrations in this service manual, but they apply to other models in
the JH4 series engines.
The contents of this service manual may not be copied or
reproduced without permission.
California
Proposition 65 Warning
Diesel engine exhaust and some of its
constituents are known to the State of
California to cause cancer, birth defects, and other reproductive harm.
California
Proposition 65 Warning
Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State
of California to cause cancer and reproductive harm.
Wash hands, after handling.
FOR SAFETY
1. SAFETY LABELS
•Most accidents are caused by negligence of basic safety rules and precautions. For accident
prevention, it is important to avoid such causes before development to accidents.
Please read this manual carefully before starting repair or maintenance to fully understand safety
precautions and appropriate inspection and maintenance procedures.
Attempting at a repair or maintenance job without sufficient knowledge may cause an unexpected
accident.
•It is impossible to cover every possible danger in repair or maintenance in the manual. Sufficient
consideration for safety is required in addition to the matters marked . Especially for
safety precautions in a repair or maintenance job not described in this manual, receive instructions
from a knowledgeable leader.
•Safety marks used in this manual and their meanings are as follows:
DANGER-indicates an imminent hazardous situation which, if
not avoided, WILL result in death or serious injury.
WARNING -indicates a potentially hazardous situation which, if
not avoided, COULD result in death or serious injury.
CAUTION-indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury.
• NOTICE - indicates that if not observed, the product performance or quality may not be
guaranteed.
2. Safety Precautions
(1) SERVICE AREA
•Sufficient Ventilation
Inhalation of exhaust fumes and dust particles may be hazardous to ones
health. Running engines welding, sanding, painting, and polishing tasks
should be only done in well ventilated areas.
• Safe / Adequate Work Area
The service area should be clean, spacious, level and free from holes in
the floor, to prevent "slip" or "trip and fall" type accidents.
•Clean, orderly arranged place
No dust, mud, oil or parts should be left on the floor surface.
[Failure to Observe]
An unexpected accident may be caused.
•Bright, Safely Illuminated Area
The work area should be well lit or illuminated in a safe manner. For work
in enclosed or dark areas, a "drop cord" should be utilized. The drop cord
must have a wire cage to prevent bulb breakage and possible ignition of
flammable substances.
•Safety Equipment
Fire extinguisher(s), first aid kit and eye wash / shower station should be
close at hand (or easily accessible) in case of an emergency.
(2) WORK - WEAR (GARMENTS)
•Safe Work Clothing
Appropriate safety wear (gloves, special shoes/boots, eye/ear protection,
head gear, harness', clothing, etc.) should be used/worn to match the task
at hand. Avoid wearing jewelry, unbuttoned cuffs, ties or loose fitting
clothes around moving machinery. A serious accident may occur if caught
in moving/rotating machinery.
(3) TOOLS
•Appropriate Lifting / Holding
When lifting an engine, use only a lifting device (crane, jack, etc.) with
sufficient lifting capacity. Do not overload the device. Use only a chain,
cable, or lifting strap as an attaching device. Do not use rope, serious
injury may result.
To ho l d o r su p po r t an e ng i n e, s ec u re t h e e n gi n e t o a su p po r t s t an d , t e st
bed or test cart designed to carry the weight of the engine. Do not
overload this device, serious injury may result
Never run an engine without being properly secured to an engine support
stand, test bed or test cart, serious injury may result.
• Appropriate Tools
Always use tools that are designed for the task at hand. Incorrect usage
of tools may result in damage to the engine and or serious personal injury.
(4) GENUINE PARTS and MATERIALS
•Genuine Parts
Always use genuine YANMAR parts or YANMAR recommended parts and
goods. Damage to the engine, shortened engine life and or personal
injury may result.
Well fitting !!
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