Yanmar L48N User manual

L48N
L70N
L100N
0ALN0-G00100
PRINTED IN JAPAN

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.
Head Office:
Yanmar Co., Ltd.
1-32 Chayamachi, Kita-ku, Osaka 530-8311, Japan
http://www.yanmar.co.jp
Yanmar America Corporation
951 Corporate Grove Drive
Buffalo Grove, IL 60089-4508, U.S.A.
TEL: [phone] FAX: [phone]
http://www.yanmar.com
Yanmar Europe B.V.
Brugplein11, 1332 BS Almere -de Vaart,
The Netherlands.
TEL: [phone] FAX: [phone]
http://www.yanmar.nl
Yanmar Asia (Singapore) Corporation Pte. Ltd.
4 Tuas Lane, Singapore 638613
TEL: [phone] FAX: [phone]
http://www.yanmar.co.jp/yasc/

L-N Operation Manual i
INTRODUCTION
L-N Operation Manual
Welcome to the world of Yanmar Engines!
Yanmar has been the leader in industrial diesel
engines for over 90 years. We developed the
world’s first practical small-sized diesel engine in
1933. Our engineers are continuously developing
new technology to keep Yanmar on the leading-
edge of the industry. The L-N Series engine is
only one example of the new technology we have
developed. We are committed to maintaining our
environment, and are proud of our history of
innovation, quality and respect for operator safety.
To help you enjoy your Yanmar L-N Series engine
for many years to come, please follow these
recommendations:
• Read and understand this Operation Manual
before you operate the machine to ensure that
you follow safe operating practices and
maintenance procedures.
• Keep this Operation Manual in a convenient
place for easy access.
• If this Operation Manual is lost or damaged,
order a new one from your authorized Yanmar
industrial engine dealer or distributor.
• Make sure this manual is transferred to
subsequent owners. This manual should be
considered a permanent part of the engine and
remain with it.
• Constant efforts are made to improve the
quality and performance of Yanmar products, so
some details included in this Operation Manual
may differ slightly from your engine. If you have
any questions about these differences, please
contact your authorized Yanmar industrial
engine dealer or distributor.
• The specifications and components (instrument
panel, fuel tank, etc.) described in this manual
may differ from ones installed on your machine.
Please refer to the manual provided by the
manufacturer of these components.
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INTRODUCTION
ii L-N Operation Manual
RECORD OF OWNERSHIP
Take a few moments to record the information you need when you contact Yanmar for service, parts or
literature.
Engine Model: _____________________________________________________________________
Engine Serial No.: __________________________________________________________________
Date Purchased: ___________________________________________________________________
Dealer:____________________________________________________________________________
Dealer Phone:______________________________________________________________________
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L-N Operation Manual iii
TABLE OF
CONTENTS
L-N Operation Manual
Page
Introduction .............................................................................................. i
Record of Ownership........................................................................... ii
Table of Contents................................................................................... iii
Yanmar Warranties................................................................................ vii
Yanmar Limited Warranty.................................................................. vii
What is Covered by this Warranty? ............................................. vii
How Long is the Warranty Period?.............................................. vii
What the Engine Owner Must Do: ............................................... vii
To Locate an Authorized Yanmar Industrial Engine
Dealer or Distributor: .................................................................. viii
What Yanmar Will Do: ................................................................ viii
What is Not Covered by this Warranty? ..................................... viii
Warranty Limitations:.................................................................... ix
Warranty Modifications:................................................................ ix
Questions: .................................................................................... ix
Retail Purchaser Registration....................................................... ix
Safety........................................................................................................ 1
Safety Statements ............................................................................... 1
Safety Precautions .............................................................................. 2
Before You Operate....................................................................... 2
During Operation and Maintenance............................................... 2
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TABLE OF CONTENTS
iv L-N Operation Manual
Product Overview.................................................................................. 13
Yanmar L-N Series Engine Features and Applications..................... 13
Component Identification................................................................... 14
Location of Labels ............................................................................. 15
Function of Major Engine Components............................................. 16
Air Cooled Engine ............................................................................. 17
Controls - Recoil Starter.................................................................... 17
Recoil Starter............................................................................... 17
Decompression Lever ................................................................. 17
Indicators and Controls – Electric Starter.......................................... 17
Indicators..................................................................................... 18
Controls ....................................................................................... 18
Inlet Air Heater ............................................................................ 19
Engine Speed Controls ............................................................... 19
Before You Operate .............................................................................. 21
Diesel Fuel ........................................................................................ 24
Diesel Fuel Specifications ........................................................... 24
Filling the Fuel Tank .................................................................... 25
Engine Oil.......................................................................................... 27
Engine Oil Specifications............................................................. 27
Engine Oil Viscosity..................................................................... 28
Checking Engine Oil.................................................................... 28
Adding Engine Oil........................................................................ 28
Engine Oil Capacity (Typical) ...................................................... 29
Daily Checks ..................................................................................... 29
Visual Checks.............................................................................. 29
Check Diesel Fuel and Engine Oil............................................... 30
Check Engine Speed Control (First Time Only) .......................... 30
Check Indicators.......................................................................... 30
Engine Operation .................................................................................. 31
Starting the Engine............................................................................ 37
Recoil Start.................................................................................. 37
Electric Start ................................................................................ 39
Check the Engine During Operation.................................................. 41
Adjust Engine Speed......................................................................... 43
Shutting Down the Engine................................................................. 44
Preparing To Stop Engine ........................................................... 44
Set Engine Speed Control to STOP ............................................ 44
Electric Start Models ................................................................... 45
After The Engine Stops ............................................................... 46
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TABLE OF CONTENTS
L-N Operation Manual v
Periodic Maintenance ........................................................................... 47
Precautions ....................................................................................... 57
The Importance of Periodic Maintenance.................................... 57
Performing Periodic Maintenance ............................................... 57
The Importance of Daily Checks ................................................. 57
Keep a Log of Engine Hours and Daily Checks .......................... 57
Yanmar Replacement Parts ........................................................ 57
Tools Required ............................................................................ 57
Ask Your Authorized Yanmar Industrial Engine
Dealer or Distributor For Help...................................................... 57
Tightening Fasteners................................................................... 58
Standard Torque Chart...................................................................... 58
Periodic Maintenance Schedule........................................................ 59
Periodic Maintenance Procedures .................................................... 61
Daily, Before Operation ............................................................... 61
Daily, After Operation .................................................................. 66
After Initial 50 Hours of Operation ............................................... 68
Every 50 Hours of Operation....................................................... 70
Every 200 Hours of Operation..................................................... 71
Every 400 Hours of Operation..................................................... 75
Every 1000 Hours of Operation................................................... 76
Every 1500 Hours of Operation................................................... 76
Every 2000 Hours of Operation................................................... 77
Troubleshooting.................................................................................... 79
Troubleshooting Chart....................................................................... 79
Troubleshooting Information.............................................................. 81
Long Term Storage ............................................................................... 83
Before You Place the Engine in Long Term Storage ........................ 83
Returning the Engine to Service........................................................ 85
Specifications........................................................................................ 87
General.............................................................................................. 87
Description of Model Number...................................................... 87
Engine Speed Specifications....................................................... 87
Engine General Specifications .................................................... 88
Principal Engine Specifications ......................................................... 89
Engine Specifications .................................................................. 89
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TABLE OF CONTENTS
vi L-N Operation Manual
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L-N Operation Manual vii
YANMAR
WARRANTIES
L-N Operation Manual
YANMAR LIMITED WARRANTY
What is Covered by this Warranty?
Yanmar warrants to the original retail purchaser that a new Yanmar L-N Series Industrial Engine will be
free from defects in material and / or workmanship for the duration of the warranty period.
THIS WARRANTY IS PROVIDED IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
YANMAR SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, except where such disclaimer is prohibited by law. IF SUCH
DISCLAIMER IS PROHIBITED BY LAW, THEN IMPLIED WARRANTIES SHALL BE LIMITED IN
DURATION TO THE LIFE OF THE EXPRESS WARRANTY.
How Long is the Warranty Period?
The Yanmar standard limited warranty period begins on the date of the delivery of the new Yanmar L-N
Series Industrial Engine to the first retail purchaser and extends for a period of twenty-four (24) months
or two-thousand (2000) engine operation hours, whichever occurs first.
What the Engine Owner Must Do:
If you believe your Yanmar engine has experienced a failure due to a defect in material and / or
workmanship, you must contact an authorized Yanmar industrial engine dealer or distributor within thirty
(30) days of discovering the failure. You must provide proof of ownership of the engine, proof of the date
of the engine purchase and delivery, and documentation of the Acceptable forms of proof of delivery date
include, but are not limited to: the original warranty registration or sales receipts or other documents
maintained in the ordinary course of business by Yanmar dealers and / or distributors, indicating the date
of delivery of the Yanmar product to the original retail purchaser. This information is necessary to
establish whether the Yanmar product is still within the warranty period. Thus, Yanmar strongly
recommends you register your engine as soon as possible after purchase in order to facilitate any future
warranty matters.
You are responsible for the transportation of the engine to and from the repair location as designated by
Yanmar.
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YANMAR WARRANTIES
viii L-N Operation Manual
Yanmar Limited Warranty - Continued
To Locate an Authorized Yanmar Industrial Engine Dealer or Distributor:
You can locate your nearest authorized Yanmar industrial engine dealer or distributor by visiting the
Yanmar Corp., LTD. website at:
http://www.yanmar.co.jp (The Japanese language page will be displayed.) For English language “click”
on “English Page.”)
• “Click” on “Network” in the web site heading to view the “Yanmar Worldwide Network.”
• Choose and “Click” on the desired product group.
• “Click” on the Icon closest to your region.
• “Click” on the desired country or Associate company to locate your nearest authorized Yanmar
industrial engine dealer or distributor.
• You may also contact Yanmar by clicking on “Inquiry” in the web site heading and typing in your
question or comment.
What Yanmar Will Do:
Yanmar warrants to the original retail purchaser of a new Yanmar engine that Yanmar will make such
repairs and / or replacements at Yanmar’s option, of any part(s) of the Yanmar product covered by this
Warranty found to be defective in material and/or workmanship. Such repairs and / or replacements will
be made at a location designated by Yanmar at no cost to the purchaser for parts or labor.
What is Not Covered by this Warranty?
This Warranty does not cover parts affected by or damaged by any reason other than defective materials
or workmanship including, but not limited to, accident, misuse, abuse, “Acts of God,” neglect, improper
installation, improper maintenance, improper storage, the use of unsuitable attachments or parts, the
use of contaminated fuels, the use of fuels, oils, lubricants, or fluids other than those recommended in
your Yanmar Operation Manual, unauthorized alterations or modifications, ordinary wear and tear, and
rust or corrosion. This Warranty does not cover the cost of parts and / or labor required to perform
normal / scheduled maintenance on your Yanmar engine. This Warranty does not cover consumable
parts such as, but not limited to, filters, belts, hoses, fuel injector nozzles, lubricants and cleaning fluids.
This Warranty does not cover the cost of shipping the product to or from the warranty repair facility.
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YANMAR WARRANTIES
L-N Operation Manual ix
Yanmar Limited Warranty - Continued
Warranty Limitations:
The foregoing is Yanmar’s only obligation to you and your exclusive remedy for breach of
warranty. Failure to follow the requirements for submitting a claim under this Warranty may result in a
waiver of all claims for damages and other relief. In no event shall Yanmar or any authorized
industrial engine dealer or distributor be liable for incidental, special or consequential damages.
Such consequential damages may include, but not be limited to, loss of revenue, loan payments, cost of
rental of substitute equipment, insurance coverage, storage, lodging, transportation, fuel, mileage and
telephone costs. The limitations in this Warranty apply regardless of whether your claims are based on
breach of contract, tort (including negligence and strict liability) or any other theory. Any action arising
hereunder must be brought within one (1) year after the cause of action accrues or it shall be barred.
Some states and countries do not allow certain limitations on warranties or for breach of warranties. This
Warranty gives you specific legal rights, and you may also have other rights which vary from
state to state and country to country. Limitations set forth in this paragraph shall not apply to the
extent that they are prohibited by law.
Warranty Modifications:
Except as modified in writing and signed by the parties, this Warranty is and shall remain the complete
and exclusive agreement between the parties with respect to warranties, superseding all prior
agreements, written and oral, and all other communications between the parties relating to warranties.
No person or entity is authorized to give any other warranty or to assume any other obligation on
behalf of Yanmar, either orally or in writing.
Questions:
If you have any questions or concerns regarding this Warranty, please call or write to the nearest
authorized Yanmar industrial engine dealer or distributor or other authorized facility.
It is very important for the original retail purchaser to register the Yanmar product. Registration
enables Yanmar to provide the best support for your Yanmar product.
At the time of purchase, Yanmar highly recommends registering the retail purchaser’s information
through website http://www.yanmar.co.jp as soon as possible.
If it is not possible to access the website, please contact the nearest authorized Yanmar industrial engine
dealer or distributor.
Retail Purchaser Registration
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YANMAR WARRANTIES
xL-N Operation Manual
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L-N Operation Manual 1
SAFETY
L-N Operation Manual
SAFETY STATEMENTS
Yanmar is concerned for your safety and your
machine’s condition. Safety statements are one
of the primary ways to call your attention to the
potential hazards associated with Yanmar L-N
Series engine operation. Follow the precautions
listed throughout the manual before operation,
during operation and during periodic
maintenance procedures for your safety, the
safety of others and to protect the performance of
your engine. Keep the labels from becoming dirty
or torn and replace them if they are lost or
damaged. Also, if you need to replace a part that
has a label attached to it, make sure you order
the new part and label at the same time.
This safety alert symbol appears with
most safety statements. It means
attention, become alert, your safety is
involved! Please read and abide by the
message that follows the safety alert
symbol.
ADANGER
Danger (the word “DANGER” is in white
letters with a red rectangle behind it) –
indicates an imminently hazardous
situation which, if not avoided, will
result in death or serious injury. Danger
is limited to the most extreme
situations.
0000001en
A
AWARNING
Warning (the word “WARNING” is in
black letters with an orange rectangle
behind it) – indicates a potentially
hazardous situation which, if not
avoided, could result in death or serious
injury.
0000001en
ACAUTION
Caution (the word “CAUTION” is in black
letters with a yellow rectangle behind it)
– indicates a potentially hazardous
situation which, if not avoided, may
result in minor or moderate injury.
0000001en
CAUTION
Caution without the safety alert symbol
indicates a potentially hazardous
situation that can cause damage to the
machine, personal property and / or the
environment or cause the machine to
operate improperly.
0000001en
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SAFETY
2L-N Operation Manual
SAFETY PRECAUTIONS
Before You Operate
During Operation and Maintenance
CAUTION
NEVER permit anyone to operate the
engine or driven machine without proper
training.
• Read and understand this Operation
Manual before you operate the
machine to ensure that you follow safe
operating practices and maintenance
procedures.
• Machine safety signs and labels are
additional reminders for safe operating
and maintenance techniques.
• See your authorized Yanmar industrial
engine dealer or distributor for
additional training.
0000002en
ADANGER
EXPLOSION HAZARD!
• Keep the area around the battery well
ventilated. While the engine is running
or the battery is charging, hydrogen
gas is produced which can be easily
ignited.
• Keep sparks, open flame and any other
form of ignition away.
• Failure to comply will result in death or
serious injury.
0000003en
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• When you remove any fuel system
component to perform maintenance
(such as changing the fuel filter) place
an approved container under the
opening to catch the fuel.
• NEVER use a shop rag to catch the
fuel. Vapors from the rag are extremely
flammable and explosive.
• Wipe up any spills immediately.
• Wear eye protection. The fuel system
is under pressure and fuel could spray
out when you remove any fuel system
component.
• Failure to comply will result in death or
serious injury.
0000009en
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SAFETY
L-N Operation Manual 3
ADANGER
FIRE AND EXPLOSION HAZARD!
• Only use the key switch to start the
engine.
• NEVER jump start the engine. Sparks
caused by jumping the battery to the
starter terminals may cause a fire or
explosion.
• Failure to comply will result in death or
serious injury.
0000004en
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• NEVER use diesel fuel as a cleaning
agent.
• Failure to comply will result in death or
serious injury.
0000012en
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• NEVER remove the fuel cap with the
engine running.
• Failure to comply will result in death or
serious injury.
0000011en
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• Only fill the fuel tank with diesel fuel.
Filling the fuel tank with gasoline may
result in a fire.
• NEVER refuel with the engine running.
• Wipe up all spills immediately.
• Keep sparks, open flames or any other
form of ignition (match, cigarette,
static electric source) away when
fueling / refueling.
• NEVER overfill the fuel tank.
• Fill the fuel tank and store fuel in a
well-ventilated area only.
• Failure to comply will result in death or
serious injury.
0000005en
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SAFETY
4L-N Operation Manual
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• Be sure to place the diesel fuel
container on the ground when
transferring the diesel fuel from the
pump to the container. Hold the hose
nozzle firmly against the side of the
container while filling it. This prevents
static electricity build-up which could
cause sparks and ignite fuel vapors.
• NEVER place diesel fuel or other
flammable material such as oil, hay or
dried grass close to the engine during
engine operation or shortly after shut
down.
• Failure to comply will result in death or
serious injury.
0000014en
ADANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is extremely flammable and
explosive under certain conditions.
• Before you operate the engine, check
for fuel leaks. Replace rubberized fuel
hoses every two years or every 2000
hours of engine operation, whichever
comes first, even if the engine has
been out of service. Rubberized fuel
lines tend to dry out and become
brittle after two years or 2000 hours of
engine operation, whichever comes
first.
• Failure to comply will result in death or
serious injury.
0000015en
ADANGER
EXPLOSION HAZARD!
• NEVER check the remaining battery
charge by shorting out the terminals.
This will result in a spark and may
cause an explosion or fire. Use a
hydrometer to check the remaining
battery charge.
• If the electrolyte is frozen, slowly warm
the battery before you recharge it.
• Failure to comply will result in death or
serious injury.
0000007en
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SAFETY
L-N Operation Manual 5
ADANGER
CRUSH HAZARD!
• When you need to transport an engine
for repair, have a helper assist you to
attach it to a hoist and load it on a
truck.
• NEVER stand under a hoisted engine.
If the hoist mechanism fails, the
engine will fall on you, causing serious
injury or death.
• Failure to comply will result in death or
serious injury.
0000008en
AWARNING
SEVER HAZARD!
• Keep hands and other body parts
away from moving / rotating parts
such as the cooling fan / flywheel.
• Wear tight fitting clothing and keep
your hair short or tie it back while the
engine is running.
• Remove all jewelry before you operate
or service the machine.
• NEVER start the engine in gear.
Sudden movement of the engine
and / or machine could cause death or
serious personal injury.
• NEVER operate the engine without the
guards in place.
• Before you start the engine make sure
that all bystanders are clear of the
area.
• Keep children and pets away while the
engine is operating.
• Check before starting the engine that
any tools or shop rags used during
maintenance have been removed from
the area.
• Failure to comply could result in death
or serious injury.
0000002enLV
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SAFETY
6L-N Operation Manual
AWARNING
EXHAUST HAZARD!
• NEVER operate the engine in an
enclosed area such as a garage,
tunnel, underground room, manhole or
ship’s hold without proper ventilation.
• NEVER block windows, vents, or other
means of ventilation if the engine is
operating in an enclosed area. All
internal combustion engines create
carbon monoxide gas during
operation. Accumulation of this gas
within an enclosure could cause
illness or even death.
• Make sure that all connections are
tightened to specifications after repair
is made to the exhaust system.
• Failure to comply could result in death
or serious injury.
0000003en
AWARNING
ALCOHOL AND DRUG HAZARD!
• NEVER operate the engine while you
are
under the influence of alcohol or
drugs.
• NEVER operate the engine when you
are feeling ill.
• Failure to comply could result in death
or serious injury.
0000004en
AWARNING
EXPOSURE HAZARD!
• Wear personal protective equipment
such as gloves, work shoes, eye and
hearing protection as required by the
task at hand.
• NEVER wear jewelry, unbuttoned
cuffs, ties or loose fitting clothing
when you are working near
moving / rotating parts such as the
cooling fan, flywheel or PTO shaft.
• ALWAYS tie long hair back when you
are working near moving / rotating
parts such as a cooling fan, flywheel,
or PTO shaft.
• NEVER operate the engine while
wearing a headset to listen to music or
radio because it will be difficult to hear
the warning signals.
• Failure to comply could result in death
or serious injury.
0000005en
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SAFETY
L-N Operation Manual 7
AWARNING
BURN HAZARD!
• Batteries contain sulfuric acid. NEVER
allow battery fluid to come in contact
with clothing, skin or eyes. Severe
burns could result. ALWAYS wear
safety goggles and protective clothing
when servicing the battery. If contact
with the skin and / or eyes should
occur, flush with a large amount of
water and obtain prompt medical
treatment.
• Failure to comply could result in death
or serious injury.
0000007en
AWARNING
HIGH PRESSURE HAZARD!
• Avoid skin contact with the high
pressure diesel fuel spray caused by a
fuel system leak such as a broken fuel
injection line. High pressure fuel can
penetrate your skin and result in
serious injury. If you are exposed to
high pressure fuel spray, obtain
prompt medical treatment.
• NEVER check for a fuel leak with your
hands. ALWAYS use a piece of wood
or cardboard. Have your authorized
Yanmar industrial engine dealer or
distributor repair the damage.
• Failure to comply could result in death
or serious injury.
0000008en
AWARNING
SHOCK HAZARD!
• Turn off the battery switch (if
equipped) or disconnect the negative
battery cable before servicing the
electrical system.
• Check the electrical harnesses for
cracks, abrasions, and damaged or
corroded connectors. ALWAYS keep
the connectors and terminals clean.
• Failure to comply could result in death
or serious injury.
0000009en
AWARNING
SEVER HAZARD!
• Stop the engine before you begin to
service it.
• NEVER leave the key in the key switch
when you are servicing the engine.
Someone may accidentally start the
engine and not realize you are
servicing it. This could result in a
serious injury.
• If you must service the engine while it
is operating, remove all jewelry, tie
long hair back, and keep your hands,
other body parts and clothing away
from moving / rotating parts.
• Failure to comply could result in death
or serious injury.
0000010en
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SAFETY
8L-N Operation Manual
AWARNING
BURN HAZARD!
• If you must drain the engine oil while it
is still hot, stay clear of the hot engine
oil to avoid being scalded. Make sure
you wear eye protection.
• Failure to comply could result in death
or serious injury.
0000011en
AWARNING
BURN HAZARD!
• Keep your hands and other body parts
away from hot engine surfaces such
as the muffler, exhaust pipe,
turbocharger (if equipped) and engine
block during operation and shortly
after you shut the engine down. These
surfaces are extremely hot while the
engine is operating and could
seriously burn you.
• Failure to comply could result in death
or serious injury.
0000015en
ACAUTION
FLYING OBJECT HAZARD!
• ALWAYS wear eye protection when
servicing the engine and when using
compressed air or high-pressure
water. Dust, flying debris, compressed
air, pressurized water or steam may
injure your eyes.
• Failure to comply may result in minor
or moderate injury.
0000003en
CAUTION
• Only use diesel fuels recommended by
Yanmar for the best engine
performance, to prevent engine
damage.
• Only use clean diesel fuel.
• NEVER remove inlet fuel screen from
the filler port. If removed, dirt and
debris could get into the fuel system
causing it to clog.
0000004enLV
CAUTION
NEVER attempt to adjust the low or high
idle speed limit screw. This may impair
the safety and performance of the
machine and shorten its life. If
adjustment is ever required, contact
your authorized Yanmar industrial
engine dealer or distributor.
0000045en
LN Series OperationManual_A4.book 8 ページ ２００６年５月１２日 金曜日 午前１０時１８分