Yanmar 4JH4-TE User manual

INDEX page No.
1. FOR YOUR SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.1 Warning Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Precautions for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. PRODUCT EXPLANATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 Use, Propulsion System, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Engine Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Names of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Major Servicing Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5 Control Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.5.1 Instrument Panel (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.5.2 Single Lever Remote Control Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5.3 Shut-down Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. BEFORE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
3.1 Fuel Oil, Lube Oil and Cooling Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.1 Fuel Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.2 Lube Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.3 Cooling Fresh Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2 Before Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.1 Supply Fuel Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.2 Supplying Engine Lube Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.3 Supply Marine Gear Lube Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.4 Supply Cooling Fresh Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2.5 Cranking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2.6 Check and Resupply Lube Oil and Cooling Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4. HOW TO OPERATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.1 Inspection before Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.2 How to Start the Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3 Remote Control Handle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4 Cautions During Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.5 Shut-down the Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.6 Long Term Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5. MAINTENANCE & INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
5.1 General Inspection Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2 List of Periodic Inspection Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.3 Periodic Inspection Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.1 Inspection on Initial 50 Hrs. of Operation (or after 1 Month) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.2 Inspection Every 50 Hrs. (or Monthly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.3.3 Inspection Every 250 Hrs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.3.4 Inspection Every 500 Hrs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.3.5 Inspection Every 1000 Hrs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.3.6 Annually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5.3.7 Every Two Years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5.4 EPA Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.4.1 EPA Certification Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.4.2 Conditions to Insure Compliance with Emission Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

5.4.3 Inspection and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6. TROUBLE AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
7. SYSTEM DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
7.1 Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.2 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

1. FOR YOUR SAFETY 1
1. FOR YOUR SAFETY
1.1 Warning Symbols
Most operation, maintenance and inspection problems arise due to users' failure to comply with the rules and
precautions for safe operation described in this operation manual. Often, users do not understand or recog-
nize the signs of approaching problems. Improper handling can cause burns and other injuries and can result
in death.
Be sure to read this operation manual carefully before operating the engine and observe all of the instructions
and precautions described in this manual. Follow the warning signs below in this manual. Pay special atten-
tion to parts containing these words and signs.
DANGER- Indicates an imminently 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.
This sign is also used to alert against unsafe practices.
• The descriptions captioned by are particularly important cautions for handling. If you
ignore them, the performance of your machine may deteriorate leading to problems.

2 1. FOR YOUR SAFETY
1.2 Safety Precautions
(Observe these instructions for your own safety!)
1.2.1 Precautions for Operation
Filler Cap of Coolant Tank
• Never open the cap of the coolant tank while the engine is still hot. Stem
and hot water may spurt out and burn you seriously. Wait until the tempera-
ture of the coolant tank has dropped, wrap a cloth around the filler cap and
loosen the cap slowly. After inspection, refasten the cap firmly.
Battery
• Never smoke or permit sparks near the battery, because it may emit explo-
sive hydrogen gas. Place the battery in a well-ventilated place.
Fuel
• Use only diesel fuel. Never use other fuels, including gasoline, kerosene,
etc., because they could cause a fire. The wrong fuel could also cause the
fuel injection pump and injector to fail due to lack of proper lubrication. Be
sure to check that you have selected the correct diesel fuel before filling the
fuel tank.
Do not use starting fluids or sprays. Their use may cause explosion, seri-
ous injury and engine damage.
Fire Prevention
• Be sure to stop the engine and confirm that there are no open flames in the
vicinity before fueling. If you do spill fuel, wipe such spillage carefully and
dispose of the wiping materials properly. Wash your hands thoroughly with
soap and water.
Never place oil or other flammable material in the engine room.
Install a fire extinguisher near the engine room, and familiarize yourself with
its use.
Exhaust Gas
• Exhaust gas contains poisonous carbon monoxide and should not be
inhaled.
Be sure to install ventilation ports or ventilators in the engine room and
ensure good ventilation during engine operation.

1. FOR YOUR SAFETY 3
Moving Parts
• Do not touch or let your clothing get caught in the moving parts of the
engine, such as the front drive shaft, V-belt or propeller shaft, during engine
operation. You will be injured.
Never operate the engine without covers on the moving parts.
Burns
• The whole engine is hot during operation and immediately after shut-down.
The exhaust manifold, exhaust pipe and high pressure fuel lines are very
hot. Never touch these parts with your body or clothing.
Alcohol
• Never operate the engine while you are under the influence of alcohol.
Never operate the engine when you are ill or not feeling well.
Battery Fluid
• Battery fluid is dilute sulfuric acid. It can blind you if it gets in your eyes, or
burn your skin. Keep the fluid away from your body. If you touch it, wash it
off immediately with a large quantity of fresh water and call your doctor for
treatment.
Fire by Electric Short-Circuits
• Always turn off the battery switch before inspecting the electrical system.
Failure to do so could cause short-circuiting and fires.
Stop the Engine before You Service it.
• Turn the battery switch off. If you must inspect while the engine is in opera-
tion, never touch moving parts. Keep your body and clothing well clear of all
moving parts.
Scalds
• When extracting oil from the engine while it is still hot, don't let the oil
splash on you.
Wait until the temperature has dropped before extracting cooling water
from the engine. Don't let It splash on you.

4 1. FOR YOUR SAFETY
Forbidden Modifications
• Modification will impair the safety and performance of the product and
shorten product life.
Also note that any troubles arising from modification are not covered by our
warranty.
Precautions for Treating Waste
• Never dispose of waste oil or other fluid in a field, sewer, river, or the sea.
Treat waste matters safely observing regulations or laws.
Ask a waste recovery company to collect it.

1. FOR YOUR SAFETY 5
1.3 Warning Labels
To insure safe operation, warning device labels have been attached. Their location is shown below and they
should always be visible. Please replace if damaged or lost.
4JH4-TE
Product safety labels
No Part Code No.
A 128377-07260
B 128377-07350
C 128296-07300
D 196630-12980
WARNING
128296-07300
A
B
D
C
008830-00X

6 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 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 new vessels be propped so the engines can oper-
ate 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 levels 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 accessible and easy to use for onboard equipment.
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 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.
Consult Yanmar's local subsidiary in your region or your distributor or dealer.
This engine is designed for pleasure boat applications.
The engine is 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)
Cruising Speed (2800 rpm or lower) for less than 90% of total engine time (9 hours out of every 10 hours)
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 functions and shorten the product life.
Please note that any troubles arising from modification of the product will not be covered by our warranty.

2. PRODUCT EXPLANATION 7
Detail of name plate
The nameplate shown below is attached to the engine. Check the engine's model, output, rpm and serial
number on the nameplate.
The nameplate shown below is attached to the marine gear. Check the marine gear's model, gear ratio, oil
used, oil quantity and serial number.
The nameplate shown below is attached to the sail drive. Check the sail drive model and serial number.
Continuous power kW
Speed of prop shaft
Gear Model
min-1
Fuel stop power kW
ENG.No.
min-1
min-1
MADE IN JAPAN
Model
MODEL KM
GEAR RATIO
OIL SAE20/30HD
OIL QTY. LTR.
NO.
KANZAKI
OSAKA JAPAN
MADE IN JAPAN
MODEL
PASSED
MARK
MFG.NO.

8 2. PRODUCT EXPLANATION
2.2 Engine Specifications
(Note)
1. Rating condition
*1 Temperature of fuel: 40
° C at FO pump inlet: ISO 8665
2. hp = 0.7355kW
3. Density of fuel: 0.842g/cm3at 15
° C
4. The "Total" oil quantity includes oil in oil pan, channels, coolers and filter.
5. The effective amount of oil shows the difference in maximum scale of the dipstick and minimum scale.
Engine model unit 4JH4-TE
Marine gear model –ZF30M KM4A2 KMH4A ZF25A SD50-4T Bobtail
Use –Pleasure use
Type –Vertical water cooled 4 cycle diesel engine
Combustion system –Direct injection
Aspiration –Turbocharged
Number of cylinders –4
Bore x stroke mm (inch) 84 x 90 (3.31 x 3.54)
Displacement l1.995
Continuous
power Output at crankshaft/ Engine speed kW (hp)/min-1 50.2(68.3) / 3101
Fuel stop
power
Output at crankshaft/
Engine speed kW (hp)/min-1 *1 55.2(75.1)/3200
Output (propeller shaft)/
Engine speed kW (hp)/min-1 *1 53.0(72.1)/3200 –
Installation –Flexible mounting
Fuel injection timing –Plunger lift at Top Dead Center
1.26±0.01mm (when W-C.S.D. is released)
Fuel injection opening pressure MPa 21.6±0.5
Main power take off –At flywheel side
Direction of
rotation
Crankshaft –Counter-clockwise viewed from stern
Propeller shaft (Ahead) –Clockwise
from stern Clockwise or
counter-clockwise
(Bi-rotation) –
Cooling system –Fresh water cooling with heat exchanger
Lubrication system –Complete enclosed forced lubrication
Cooling water capacity
(fresh water) l (quart) Engine:7.2(7.6), Coolant recovery tank: 0.8(0.8)
Lubricating
oil capacity
(engine)
Rake angle deg. 7 deg. 0 deg. 7 or 0 deg.
Total (Note 4)
l (quart)
5.7±0.3
(6.0±0.3) 6.9±0.3 (7.3±0.3) Refer to left
Oil pan only 5.2±0.3
(5.5±0.3) 6.4±0.3 (6.8±0.3) Refer to left
Effective (Note 5) 2.4(2.5)

2. PRODUCT EXPLANATION 9
Engine model unit 4JH4-TE
Marine gear model –ZF30M KM4A2 KMH4A ZF25A SD50-4T Bobtail
Starting
system
Type –Electric
Starting motor V-kW DC 12V - 1.4 kW
Alternator V-A 12V - 80A (12V - 60A optional)
Engine
Dimension
Overall length
mm (inch)
923
(36.3) 903 (35.6) 933 (36.7) 1017 (40.0) 782 (30.8) 782 (30.8)
Overall width 616(24.3)
Overall height 659(25.9)
Flywheel major dimension mm (inch) D339 x 66 (13.3 x 2.6)
Engine dry mass
(include marine gear) kg 235 237 238 237
249
(engine 207)
207

10 2. PRODUCT EXPLANATION
Marine gear and sail drive
* At continuous power: Engine speed 3101 min-1
Model –ZF30M KM4A2 KMH4A ZF25A SD50-4T
(coupled
at boat
builder)
Down angle deg. 0 7 8 8 –
Applicable engine
model –4JH4-TE
Type –Mechanical wet
multiple disk
clutch Mechanical
cone clutch Hydraulic wet
multiple disk
clutch
Hydraulic wet
multiple disk
clutch
Mechanical
cone
clutch
Reduction ratio
(Forward/Reverse) –2.15/
2.64 2.70/ 2.64 1.47/ 1.47 2.14/ 2.14 2.63/ 2.63 2.04/ 2.04 2.45/ 2.45 1.93/ 1.93 2.48/ 2.48 2.32
Propeller speed
(Forward/Reverse) *
min-1 1444/
1176 1150/ 1176 2115/ 2113 1451/ 1450 1180/ 1179 1520/ 1520 1263/ 1263 1607/ 1607 1250/ 1250 1337
Lubrication system –Splash Centrifugal pump Trochoid pump Trochoid pump Oil bath
Lube oil –ATF API CD or higher
SAE #20 or #30 ATF
QuickSilver
®
only
Lube oil capacity
(total) l
(quart)
1.1(1.2) 2.0(2.1) 2.0(2.1) 1.8(1.9) 2.2(2.3)
Lube oil capacity
(effect) 0.2(0.2) 0.2(0.2) 0.2(0.2) –0.1(0.1)
Cooling system –Seawater cooling –
Mass kg 27.5 30 31 30 42

2. PRODUCT EXPLANATION 11
2.3 Names of Parts
4JH4-TE
• Operation side
• Non operation side
1 Intake silencer 5 Lube oil cooler 9 Fuel priming pump
2 Turbocharger 6 Lube oil filter 10 Dipstick
3 Shift lever 7 Fuel injection pump 11 Intake manifold
4 Marine gear (KMH4A) 8 Fuel filter 12 Oil filler cap
1Engine name plate
(on the rocker arm cover) 4 Seawater pump 7 Exhaust mixing elbow
2 Coolant filler cap 5 Alternator 8 Coolant tank/Heat exchanger
3 Belt cover 6 Starter motor
12
11
9
10
8
7
6
5
4
3
2
1
008831-00X
1
2
8
5
7
6
4
3
008832-00X

12 2. PRODUCT EXPLANATION
2.4 Major Servicing Parts
Name of part Function
Name plate Name plates are provided on the engine and the marine gear and have the model serial number
and other data.
Fuel filter Removes dust and water from fuel. The filter is a cartridge type, and the inner element should be
replaced before clogging occurs.
A water separator is on the bottom of the filter and should be drained periodically.
Fuel priming pump
(on fuel filter) This is a manual fuel pump. Moving the knob on the top of the fuel filter feeds the fuel. The pump is also used to bleed air from the fuel system.
Fuel feed pump This is a mechanical pump used to feed fuel to the fuel injection pump.
It is built into the fuel injection pump.
Filler port
(engine) Filler port for engine lube oil.
Filler port
(marine gear) Filler port for marine gear lube oil. Located on the top of the marine gear case.
Dipstick
(engine) Gauge stick for determining the level of the engine oil.
Lube oil filter Filters fine metal fragments and carbon from the lube oil. The filter is a cartridge type,
and the inner element should be replaced before clogging occurs.
Cooling System There are two cooling water paths: fresh water and seawater.
The engine is cooled by the fresh water/coolant in a closed circuit. The fresh water/coolant is
cooled by seawater in a heat exchanger.
The seawater also cools the marine gear-oil and also intake air (depending on model) through
cooler (s) in an open circuit.
Fresh water pump The centrifugal pump circulates fresh water/coolant inside the engine. The fresh water pump is
driven by V-belt.
Sea water pump Pumps seawater from outside vessel to the engine. The seawater pump is gear-driven and has a
replaceable rubber impeller.
Filler cap
(fresh water/coolant) When the cooling water temperature rises, the pressure inside the fresh water tank increases. The pressure valve in the filler cap is open then hot water and steam pass through a rubber hose to
the coolant recovery tank. When the engine becomes cool and the pressure inside the fresh water
tank drops, the vacuum valve in the filler cap opens and the water in the coolant recovery tank
returns to the water tank through the pipe and filler cap. This minimizes cooling water consump-
tion.
Coolant recovery
tank Coolantrecoverytankkeepstemporarilyfreshwater/coolant, which overflows fromthefreshwater tank through the filler cap.
Fresh water/coolant level can easily be checked and refilled in this tank.
Oil cooler
(engine oil) This heat exchangers cools the engine oil with fresh water.
Oil cooler
(marine gear oil) This heat exchangers cools the marine gear oil (KMH4A) with seawater.
Intake silencer The intake silencer guards against dirt in the air and reduces the noise of air intake.
Turbocharger The exhaust gas turbine is rotated by exhaust gas and the power is used to rotate the blower.
The blower pressurizes the intake air, which gives high output.
Starter This is a DC motor for electrical starting. Electric current causes the pinion gear to engage with
the ring gear on the flywheel to start the engine.
Alternator This is a AC generator built in the rectifier and regulator which rotates by V-belt drive to charge the
battery during engine running.

2. PRODUCT EXPLANATION 13
2.5 Control Equipment
The equipment in the control room, making remote control possible, consists of the instrument panel, which is
connected to the engine by wire harness, and the remote control handle, which is hooked up by remote con-
trol cables to the engine control lever and marine gear.
2.5.1 Instrument Panel (Option)
(1) Equipment and Functions
The instrument panel is located in the cockpit. The following instruments enable you to start / stop the engine
and to monitor its condition during operation.
• B type
• C type
1 Tachometer 4 Key switch 7 Water in sail drive seal alarm
2 Hour meter 5 Stop button 8 Lube oil low pressure alarm
3 Moisture cap for key switch 6 Battery low charge alarm 9 Coolant high temperature alarm
1 Coolant high temperature alarm 6 Hour meter 11 Water in sail drive seal alarm
2 Coolant temperature meter 7 Moisture cap for key switch 12 Water in fuel filter alarm
3 Lube oil low pressure alarm 8 Key switch 13 Seawater insufficient flow alarm
4 Lube oil pressure meter 9 Stop button
5 Tachometer 10 Battery low charge alarm
008402-00X
1
2
3
4
5
6
7
8
9
008426-00X
1
56
7
8
9
10
11
12
13
2
3
4

14 2. PRODUCT EXPLANATION
(2) Meters
B type and C type panels use analog electric systems and have a pointer indicator.
Instruments, equipment Functions
Key switch
Rotary switch with 4 positions OFF The switch key can be inserted or removed. All electric current is cut off.
ON The electric current to the controls and equipment is turned on.
Engine keeps running.
To stop the engine, the key switch should be in the ON position. After stop-
ping the engine, please turn OFF the key switch.
START The start position of the engine.
The electric current to the starting motor is turned on.
When you release the key, it will automatically turn to ON position.
GLOW The start aid position of the engine.
The electric current to the air heater /glow plug is turned on.
When you release the key, it will automatically turn to ON position.
JH4 series: Air heater is an option.
Note
Whenyou don’t usetheengine,please removethekey from the keyswitchandcover
the keyhole with the cap to protect from corrosion.
Stop button switch Push button switch to stop the engine.
The electric current to the stop solenoid is turned on.
Instruments, equipment Functions
Tachometer The engine’s rotation speed is indicated.
Hour meter The number of hours of operation is indicated, and can be used as a guide for peri-
odic maintenance checks.
The hour meter is at the bottom of tachometer.
Coolant temperature meter
(C type only) The coolant temperature is indicated. It enables monitoring of the cooling condition of the engine.
Lube oil pressure meter
(C type only) The engine oil pressure is indicated. It enables monitoring of the pressure of the engine’s lube oil.
Panel lights When turning the key switch to ON, the meters light, for easy viewing.
008407-00X

2. PRODUCT EXPLANATION 15
(3) Alarm Equipment (Lamps and Buzzer)
When the sensor detects a problem during operation, the lamp comes on and the buzzer sounds.
Alarm lamps are located on the panel, buzzer is located on the back of panel.
Under normal conditions, the monitors are off. When there is a problem, the monitors light up.
(4) Normal Action of Alarm Devices
Alarm devices act as shown below.
Please check that the alarm lamps and buzzer are working normally, when the key is turned on.
Battery low
charge alarm When the alternator output is too low, the lamp will come on. When charge begins, the lamp will turn off.
(The alarm buzzer will not sound, when the lamp comes on.)
Coolant high
temperature
alarm
When the temperature reaches the maximum (95°C[203°F] or higher), the lamp will
light and the alarm will sound.
Continuing operation at temperatures exceeding the maximum limit will result in dam-
age and seizure.
Check the load and the fresh water cooling system for any abnormalities.
Lube oil low
pressure alarm When the lube oil pressure falls below normal, the oil pressure sensor will register this and the lamp will come on and alarm will sound.
Continuing operation with insufficient oil pressure will result in damage and seizure.
Check the oil level.
Water in sail
drive seal alarm When sea water is detected between the seals of sail drive, the lamp will come on and alarm will sound.
Water in fuel
filter alarm
(C type only)
When the drain inside the water separator in the fuel filter becomes excessive, the
sensor will cause the lamp to come on.
Sea water
insufficient flow
alarm
(C type only)
This function is not available on this engine.
Key switch OFF → ON START → ON
Engine Before start Running
Alarm buzzer Sound Stop
Alarm lamps Battery low charge alarm Light Off
Coolant high temperature alarm Off Off
Lube oil low pressure alarm Light Off
Water in sail drive seal alarm Off Off

16 2. PRODUCT EXPLANATION
2.5.2 Single Lever Remote Control
Handle
This remote control system uses a single handle to
operate the marine gear-clutch (neutral, forward,
reverse) and to control the engine speed.
NEUTRAL: Power to the propeller shaft is cut off
and the engine idles.
The handle controls the direction of the boat (ahead
or astern) and, at the same time, acts as an accelera-
tor increasing the engine speed as it is pushed fur-
ther in the FWD or REV direction.
If the handle is pulled out, engine speed can be con-
trolled without engaging the clutch (clutch remains in
the NEUTRAL, no load position).
When turning the knob clockwise, the handle is fixed.
When loosening the knob, the handle can be moved.
Yanmar recommends the use of a single-lever type
for the remote control system. If only the two-lever
type is available in the market, operate the engine at
1000 rpm or lower before engaging and disengaging
the marine gear-clutch.
1
4
32
5
008427-00X
2
1
(Only engine speed control)
008441-00E
1 FWD (forward, low speed) 4 Max. engine speed
2 REV (reverse, low speed) 5 Max.engine speed
3 NEUTRAL (boat is stopped)
1 Pull out handle 2 Knob