English - Nanni Industries
Nanni marine engine
Operator’s manual
Engines
N3.30
N4.38
English
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Français
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Italiano
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Deutsch
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1
CONTENTS
Introduction ............................. 1
Maintenance .......................... 32
About this manual .........................2
Service schedule.........................33
General inspection ......................35
Fuel system ................................37
Lubrication system .....................41
Cooling system ..........................43
Raw water system ......................47
Electrical system ........................51
Battery ........................................52
Corrosion protection ...................54
Long term storage ......................57
Safety........................................ 3
Emergency kit ..............................3
Safety alert symbols .....................3
Safety icons ..................................4
Safety precautions .......................5
Overview .................................. 9
About the engine ..........................9
About the propeller .....................14
Behaviour of the boat .................14
Engine main components ..........15
Instruments panel ................. 19
Standard panel ...........................19
Instrumentation ..........................20
Operation ............................... 25
Before starting ............................25
Starting the engine .....................26
During operation ........................28
Stopping the engine ...................30
Troubleshooting .................... 59
Technical data ....................... 61
2
INTRODUCTION
Thank you for choosing a Nanni product!
Contact a Nanni authorized dealer for the servicing of your product. A list of
dealers can be found on our web site:
www.nannidiesel.com
Nanni engines are the product of many years of experience in the development of marine engines and equipment designed for use in open seas.
Your engine is built with the finest materials in accordance with precise
specifications and strict production methods.
Before operating the engine, make sure that this manual is applicable to the
engine. Refer to the Identification plate if you are not sure about the engine
model designation. If you don’t have the correct manual, please contact
your Nanni authorized Dealer.
Correct installation of the engine on your boat is of the greatest importance
for safe navigation and protection of the environment. The installation
should be carried out by an authorized Nanni workshop in accordance with
the installation instructions.
1
About this manual
This Operator’s Manual contains
important information, tips, suggestions and warnings. We urge you
to read it carefully and familiarize
yourself with the engine before
starting.
For your own safety and longer
service life of the engine, follow
the instructions and warnings
contained in this manual and in all
documentation provided with the
boat. Ignoring them could result in
damage to the engine or personal
injury to you or others.
Please ensure that this Manual is
always kept in the boat. It should
always be available to anyone
else using the engine, i.e. anyone
renting, borrowing or buying the
engine from you. Throughout the
document, the following symbols
are used to ease the reading:
 Indicates that the text is continued on the following page.
 Indicates the end of a section.
2
Content and updates

All the informations and specifications in this Manual are based on
the technical data applicable at the
time of its publication. Changes and
updates may be made by Nanni
without notice.
Illustrations are intended as a
general guide, and may vary from
the equipment fitted in the engine in
some details. Some sections of the
Manual do not apply to all engines.
If this is the case, a text indicates
which engines it applies to.
If there are any equipment details
that are not shown or described
in this Operator’s Manual, or if
you have any questions about the
operation of any equipment, your
authorized Nanni Dealer will be
glad to inform you of correct care
and operating procedures.

3
SAFETY
Read this chapter carefully as it
concerns your safety. Most accidents are caused by failing to follow
basic safety rules. Be aware of the
possible risks involved in handling
the engine and make sure to take
the necessary precautions to protect yourself, those around you and
the equipment.
Read all informations supplied with
the boat before starting the engine
for the first time.
Always ensure that the maintenance of the boat and all equipment has been done in accordance
with the instructions stated in the
relevant Manual. Have all mandatory and necessary safety equipment
handy in the boat and serviceable.
Emergency kit
You can order an emergency kit
from any Nanni authorized dealer.
The engine emergency kit contains
several components to carry out
simple repair in the event of a fault.
Always have an complete emergency kit onboard and necessary
tools to carry out any repairs.

3
Safety alert
symbols
General rules of safety precautions
to follow are indicated in this Manual. They are indicated as follows:
I DANGER
Indicates a hazardous situation
which, if not avoided, will result
in death or serious injury.
I WARNING
Indicates a hazardous situation
which, if not avoided, could result in death or serious injury.
I CAUTION
Indicates a hazardous situation
which, if not avoided, could result in minor or moderate injury,
or could cause property damage.
NOTICE: Indicates important information in order to facilitate handling
or avoid property damage.

Safety icons
Several stickers are fixed directly
on the engine. They are intended
to help you to quickly identify the
location of certain components
and avoid possible hazards when
working on the engine.
Indicates where to check the
coolant level.
Indicates where to check the
engine oil level.
Indicates the coolant drain
orifice.
Ensure these stickers are always
visible and change them if necessary.
Refers to important informations and instructions to follow
before handling the engine.
Indicates possible electrical
hazards.
This icon indicates a risk of
fire.
Indicates hot parts entailing
substantial risks of burns.
Indicates an area containing
pressurised fluids.
Stipulates that no flames or
sparks should be created in the
vicinity.
Indicates hazardous rotating
parts.
Indicates the de-aeration
orifice(s) (air bleed).
4
Indicates the oil drain orifice.

Safety
precautions
Exhaust gas
Exhaust gases contain carbon
monoxide. This colourless and
odourless gas is extremely harmful and could lead to poisoning
which could result in loss of
consciousness or death. The first
symptoms of carbon monoxide
intoxication are as follows:
• Dizziness
• Nausea
• Headache
• Throbbing temples
• Vomiting
• Fatigue and falling asleep
• Tense muscles
If you or anyone else in the vicinity
of the engine experiences any of
these symptoms, leave the area
of operation of the engine and find
fresh air. If the symptoms persist,
consult a doctor and have the engine checked.
Ensure the exhaust circuit correctly
expels the gas produced by the
engine. Regularly check that the
exhaust circuit is free of leaks and
that the exhaust elbow is in good
condition.
5
Burns
Never touch the hot parts of the
engine! An operational engine gets
very hot: the exhaust system, turbocompressor (if equipped), starter,
oil sump, oil, coolant in the hoses
and pipes are hot and can burn.
Fluids ejected under pressure can
cause serious injury. Release all
the pressure in the circuits before
removing the caps. Never open the
oil circuit and coolant caps when
the engine is operational and/or
hot. Never start or run the engine
when the oil fill and coolant caps
are not screwed on as hot oil or
coolant could spray out.
If you come into contact with any
of these fluids, consult a doctor
immediately. If the engine gets too
hot, switch it off and disconnect it
and wait for it to cool down before
checking for failure.
Fire
Do not smoke near the engine and
keep it away from sources of ignition (flames or sparks) or any other
potential flammable vapour or liquid
sources. Do not run the engine
without the air filter.
Do not run the engine in an area
in which flammable or explosive
materials are stored or where gas
is present. Ensure there are no
flammable liquids in the engine
compartment.
Immediately clean up any liquids
spilled and keep the engine compartment clean and accessible so
as to minimise the risk of fire. Be
careful as fuel can burn. Damaged
pipes can lead to fire.
Explosion
Explosions caused by fuel vapour
can cause serious injury! Carefully
follow the safety rules when filling
the fuel.
Open and ventilate the storage
area of the engine after filling.
Check that there are no fuel vapours or leaks before starting the
fan (if fitted). Switch the fan on for 5
minutes before starting the engine.
All fuel vapours are flammable
and explosive. Be careful when
handling and storing fuel. Store
the fuel in a ventilated area away
from sources of ignition (sparks
or flames) and out of the reach of
children.
Stop the engine before filling with
fuel or lubricant. Do not smoke near
the engine and keep it away from
sources of ignition (flames) when
filling with fuel and/or lubricant.
Wear gloves when investigating
possible leaks.
Do not alter or damage the fuel circuit. Close the fuel circuit whenever
you work on it. Ensure you always
have an appropriate working fire
extinguisher to hand.
6
Hazardous Voltage/
Electrical Shock
Electrocution is possible whenever
electricity is present. Hazardous
voltage can cause severe injury
or death. Operate the engine only
when all guards and electrical enclosures are in place.
Open the main circuit breakers
of all power sources before servicing the equipment. Configure the
installation to electrically ground the
engine, transfer switch, and related
equipment and electrical circuits to
comply with applicable codes and
standards.
Never contact electrical leads or
appliances when standing in water
or on wet ground because these
conditions increase the risk of
electrocution. The voltage at these
terminals can cause death.
Short circuits can cause bodily
injury and/or equipment damage
Remove all jewellery before servicing the equipment.
Hazardous backfeed voltage can
cause severe injury or death.
Connect the engine to the building/marina electrical system only
through an approved device. Work
on the electrical circuit should only
be carried out by qualified technicians.
Operations on the shore power
equipment must only be carried out
by electricians authorized to work
with high voltage installations.
Special attention must be brought
on boat with metallic hull, especially
concerning the protection of the
persons against electrical shock
and the protection against galvanic
and electrolytic corrosion.
Battery acid
The acid in batteries can cause
serious injury and even death!
When servicing the batteries, wear
protective gloves and goggles. Batteries contain sulphuric acid which
is highly corrosive.
Acid can spurt from batteries when
they are handled. If the acid comes
into contact with the skin, rinse thoroughly in fresh water and consult
a doctor.
Risk of battery explosion
A battery explosion can cause
serious injury and even death! Ensure the battery storage compartment is corrected ventilated.
Do not smoke near the batteries
and keep them away from sources
of ignition (flames or sparks). They
produce hydrogen which could
ignite or explode on contact with an
electrical arc or a flame.
Switch off all electrical appliances
in the vicinity when you are working
on the batteries.
7
Ventilate correctly storage batteries
compartment. Avoid touching the
battery terminals with metal tools
so that no sparks are created which
could cause an explosion. Remove
the rings, bracelets and necklaces
before handing the batteries.
Rotating parts
Rotating parts can be extremely
dangerous and cause serious injury
and even death!
Do not work on the engine when
it is operational. If work on the
engine when running is absolutely
necessary, do not touch any hot or
rotating parts.
Baggy clothing, hair or objects
could be pulled in and/or caught
and cause serious injury or substantial property damage.
Do not wear bracelets, necklaces
or rings when working on a engine.
Check that the bolts and screws
are properly tightened and that
the protection mechanisms are in
place. Do not check the tension of
the alternator belt when the engine
is operational.
Accidental starting
Accidental starting can cause serious injury and even death!
Disconnect the battery before working on the engine. Ensure no one
is alongside the engine or working
on before starting it. A rotating
propeller can cause serious injury
or death. Ensure all the protection
mechanisms are in place before
starting the engine.
Chemical products
The different fluids used to run the
engine are a health hazard. Carefully read the instructions on the
packaging of these products and
always check that the ventilation in
the hold space is adequate.
Follow environmental regulations
concerning the disposal of oil, fuel,
coolant, filters and batteries. Do
not put your hands over pipes when
looking for possible leaks.
Water ingress
The engine should be protected
against from water ingress by any
means. Water ingress leads to
complete engine failure. This is not
cover under any warranty terms.
Water can enter the engine after
filling the exhaust system.
Correct installation of the engine on
your boat is of the greatest importance for safe navigation and pro-
8
tection of the environment. The first
protection against water ingress is
a correct installation of the engine.
A correct use of the engine is also
important to protect the engine
against water ingress. The operator/owner is responsible for the
correct operation of the engine and
for the implementation of all necessary means to protect the engine
against water intrusion.
After a vessel capsizing, or if the
engine has been filled with water,
do not start the engine, except in
extreme emergencies, and contact
an authorized Nanni dealer.
4
OVERVIEW
About the engine
reak in
B
Engine identification
Operate the engine with care for
the first 50 hours of operation.
Both the engine and the transmission has an identification plate that
contain several informations.
Keep these plates accessible and
in good condition. Record and keep
the engine and transmission serial
number and designation. These
numbers should always be quoted
when ordering service and replacement parts.
The engine identification plate is as
follow:
Do not race the engine while it is
cold. Do not operate it at full load
except for short periods. Never
run the engine at constant engine
speed for long periods during the
break in period.
Check the oil and coolant level
frequently during the running-in
period. The oil consumption can be
more important during the runningin period.
Engine installation
The installation must be carried out
by an authorized Nanni workshop
in accordance with the installation
instructions. Correct installation
of the engine is of the greatest
importance for safe navigation and
protection of the environment.
• TYP indicates the commercial
designation of the engine.
• NR indicates the engine serial
number.
• CODE lists various specifications
of the engine.
9
It also ensure maximum service life
under normal conditions of use.
Engine damage caused by failure
to follow installation instructions is
not covered by the warranty.
Remote Control
Power Take Off
The remote control is an optional
extra not in the scope of supply
of the engine. The remote control
installed on the boat can be different than the ones shown in this
document.
Some engines can be fit with a
Power Take Off system. This system allows to power accessories
like bilge pump, watermaker, etc.
On most boats, the control lever
controls both the engine rpm and
the gear shift (ahead / astern).
However, some boats can be
equipped with a separated shift
command.
It can also be fitted with a neutral
safety switch that prevents the
engine from starting until the lever
is in neutral position.
Consult the boat builder or your
Nanni dealer if you are not sure
about the operation of the remote
control.
NOTICE: Any mechanical power
taken from the engine from a PTO
reduces the power delivered to the
propeller. The use of a PTO should
always be studied and approved
by the R&D department of Nanni
Industries S.A.S France. Contact
your Nanni dealer for more informations.
Trolling valve
The Trolling valve system allows
to reduce the rotation speed of the
propeller below its speed when the
engine is at idle. The boat speed is
reduced by 30% to 70%.
I CAUTION
The Trolling valve system must
never be used for manoeuvring.
It also must never be used at an
engine speed of more than 1200
rpm.
10
Operation in cold
weather conditions
Nanni engines are designed to operate effectively in cold weather.
However, for effective starting
and cold weather operation, extra
care are necessary. Contact your
Nanni dealer for additional information and local availability of cold
weather aids.
Oil viscosity
Use seasonal grade viscosity
engine oil based on the expected
air temperature range between oil
changes.
Follow the diagram below to adapt
the oil viscosity:
In all cases, fuel quality and fuel
sulfur content must comply with all
existing emissions regulation for the
area in which the engine operates.
11
SAE 5W-30
SAE 10W-30
However, using winter grade fuel
may reduce power and fuel efficiency as winter grade fuel has a lower
BTU (heat content) rating. Check
the grade of fuel being used before
troubleshooting for low power complaints in cold weather operation.
SAE 15W-40
Winter grade fuel allows to protect
the injection system when temperatures fall below 5°C (40°F). Winter
grade fuel is best suited for cold
weather operation thanks to its
lower cloud and lower pour points.
SAE 15W-40
WINTER GRADE FUEL
50 o C
122o F
40 o C
104o F
30 o C
86 o F
20 o C
68 o F
10 o C
50 o F
0o C
32 o F
-10 o C
14 o F
-20 o C
-4 o F
-30 o C
-22 o F
-40 o C
-40 o F
As an option, some engines are
available with an air intake heater to aid cold weather starting.
Contact your Nanni dealer for more
informations.
Engine homologation
The engine type can be exhaust
emission certified. It means that
Nanni guarantees that all engines
of the same type that are manufactured are approved and certified by
the authorities in accordance with
different exhaust emissions standards.
However, for the engine to be in accordance with this standards, special requirements for maintenance
and service are to be followed:
• Only Nanni replacement parts
must be used.
• Maintenance intervals must be
observed.
• The engine must not be modified
in any way except with accessories and service kits approved by
Nanni Industries S.A.S. France.
• Service of the fuel system must
always be carried out by an authorized Nanni workshop.
• No modifications to the air intake
and exhaust system may be
undertaken.
• Seals may only be broken by
authorized personnel.
• The operation instructions stated
in the relevant manuals should
be follow by the user.
Nanni’s responsibility for the engine
specification being in accordance
with the certification will be invalidate if one or several of this conditions are not followed.
12
Environmental
responsibility
Nanni designs its engines to have
minimum environmental impact.
This objective, however, can only
be achieved with your full cooperation.
Our operating and maintenance
instructions are to help you to protect your engine and adopt environmentally responsible behaviour.
Ensure you only use the fuels and
oils recommended. Using another type of fuel or oil could cause
major malfunctions, an higher fuel
consumption, a reduced engine
service life, and a greater discharge
of exhaust gases.
When draining the oil and changing
the oil or fuel filter, dispose of the
waste in an appropriate container.
These fluids cause major damage
to flora and fauna if discharged into
nature. Use an absorption kit in the
event of accidental discharge of oil
or fuel into the water.
Warranty
This manual is supplemented by
a Warranty Information Booklet.
We recommend that you read this
publication thoroughly.
Pay special attention to the applicable duty cycle and to the limitations that result. Failure to comply
with the warranty conditions will
void the Warranty.
The validity of the Warranty is also
dependent on proper installation
and maintenance operation being
carried out by an authorized Nanni
representative.
NOTICE: Late or improper maintenance or use of spare parts other
than Nanni original spare parts will
invalidate Nanni’s responsibility for
the engine accordance with homologation and will void the Warranty.
Modifications to the engine’s settings, as well as any other technical modification (accessories,
spare parts, additional equipment,
etc) ARE FORBIDDEN WITHOUT WRITTEN AUTHORIZATION
FROM NANNI INDUSTRIES S.A.S.
Any modification will void the Warranty. Damage caused by failure
to follow operation instructions or
incorrect operation is also not covered by the warranty.
13
Commissioning
inspection
Commissioning inspection is a
condition of the validity of the Limited Warranty. Moreover, it allows
the registration of the product at the
factory and record important informations regarding the product.
By registering the product, you will
receive the best warranty coverage
possible and Nanni will be able to
contact you in the event of updates
or service notifications.
Operations to be performed during
commissioning inspection are specified in the Warranty Booklet. The
commissioning inspection must be
signed by the seller and the owner
of the engine.
It’s the owner responsibility to
control that the commissioning
inspection has been fully completed and signed by the person who
carried out the inspection.
The informations regarding the
RPM must be taken using an electronic tachometer. Never use the
tachometer of the instrument panel
for this purpose.

About

the
propeller
Behaviour of the
boat
The propeller is a critical component of the propulsion system. It
converts the engine power in thrust.
To be efficient, the propeller must
be perfectly adapted to the boat
and to its use.
If this is your first boat or if you are
not familiar with the boat, we urge
you to practice controlling the boat
at slow speed as a first step.
Avoid violent manoeuvres or
unexpected speed changes while
sailing. People can fall over or
overboard.
Keep also in mind that the weight
distribution (passengers, equipments, etc.) inside the boat has
an impact on the behaviour of the
boat when cruising. Depending the
position of the load, the behaviour
of the boat may change, particularly
in the case of a planning hull.
In all cases, the propeller should
allow the engine to reach its rated
rpm with the maximum boat load.
A faulty operation of the engine is
often due to an inadequate and / or
damaged propeller.
14
The condition of the hull and the
propeller is also a critical factor. A
dirty and / or damaged hull will modify the behaviour of the boat and
therefore the engine performance.
It can also cause cavitation which
can seriously erode the surface of
the propeller, the drive, etc.
Engine main components
NOTICE: The engine may not be exactly as represented here. Some components may not be part of the engine ordered.
P/N
COMPONENTS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
15
Alternator
Alternator belt
Starter
Fuses box
Air filter
Fuel filter
Fuel feed pump
Fuel injection pump
Heat exchanger
Coolant filler plug
Coolant pump
Recovery tank
Coolant drain plug
Raw water pump
Oil filter
Oil filler port
Oil gauge
Water cooled exhaust elbow
Transmission
N3.30
11
6
9
1
12
4
18
14
13
19
3
15
10
17
16
5
14
2
8
7
16
N4.38
16
10
17
9
12
18
1
14
2
15
3
13
5
4
11
6
8
19
7
17
Note
18
5
INSTRUMENTS
I WARNING
Read the starting and stopping
instructions before operating the
engine.
PANEL
Standard panel
A4 PANEL
RPM x 100
The instrument panel provides you
with important informations about
the engine.
NOTICE: This chapter only describes instruments and panels that
come standard on Nanni engines.
Contact your dealer if the boat is fitted with instruments not described
in this chapter or if you are not sure
about their function. Depending
the boat, the warning lamps and
the instruments can be installed
separately without the panel shown
here.
On some boats, a panel without key
is used as an additional instrument
panel in Flying Bridge position. A
main panel fitted with a key switch
generally located in the wheelhouse is used to prevent unauthorized starting from the additional
panel. To start the engine using
the additional panel, the key of the
main panel should be switched to
IGNITION position.
19
C4 PANEL
RPM x 100
Instrumentation
Tachometer & Warning
lamps
The analog tachometer displays the
engine speed. Multiply the indicated
value by 100 to get the revolutions
per minute of the engine.
The function of the warning lamps
is explained in the following pages.
RPM x 100
Hourmeter & Voltmeter
The display at the bottom of the
dial shows the operating time of the
engine in hours
When the system voltage is
connected, the display indicates the
voltage at the battery terminals.
20
Starter switch
The starter switch allows to start
and stop the engine.
The ON/STOP switch allows to
connect the system voltage and to
stop the engine.
The START button allows to preheat the engine and engage the
starter.
Engine oil pressure
indicator
Coolant temperature
indicator
NOTICE: This indicator does not
show the engine oil level. This
indicator shows the oil pressure in
bar and psi.
Indicates the coolant temperature in
Celsius and in Fahrenheit degrees.
If the oil pressure in the lubrication
circuit is too low, the acoustic alarm
sounds and the corresponding warning lamp comes on.
21
If the coolant temperature is too
high, the acoustic alarm sounds
and the corresponding warning
lamp comes on.
Warning lamps
BATTERY CHARGE
COOLANT TEMPERATURE
This warning lamp comes on when
the system voltage is connected.
This warning lamp comes on and
the alarm sounds when the coolant
temperature is too high.
I DANGER
Never open the coolant filler cap
or any plug of the cooling system
when the engine is warm. Steam
or hot fluid can spray out.
I CAUTION
 If this alarm comes on while
the engine is running, stop the
engine, except in extreme emergencies, and check the coolant
level, the belt condition, the raw
water filter condition, and that
the sea cock is open.
 Operating the engine while
the coolant temperature is too
high can lead to severe engine
damage. Do not operate the
engine if the problem persists
and contact a Nanni workshop
as soon as possible.
22
If this lamp lights up when the
engine is running, it indicates that
the alternator of the engine is not
charging.
The cause can be a fault in the
electrical system or because the
alternator belt is slack.
I CAUTION
 If this alarm comes on while
operating the engine, stop the
engine, except in extreme emergencies, and check components
of the belt system. Also check
components of the electrical
system (fuses, battery, etc).
 Do not operate the engine if
the problem persist and contact
a Nanni workshop as soon as
possible.

PREHEATING
WATER IN FUEL FILTER
This lamp comes on when the glow
plugs (if fitted) are activated.
This lamp lights up and the alarm
sounds when there is too much
water in the fuel filter of the engine
(not applicable on some engines).
ENGINE OIL PRESSURE
If this alarm comes on, stop the
engine and drain the water in the
fuel filter.
This warning lamp lights up and the
alarm sounds when the engine oil
pressure is too low.
I CAUTION
 If this alarm comes on while
operating the engine, stop the
engine, except in extreme emergencies, and check the engine
oil level and the oil filter condition.
 Operate the engine when the
oil pressure is too low can lead
to severe engine damage. Do
not operate the engine if the problem persist and contact a Nanni
workshop as soon as possible.
23

Note
24
6
OPERATION
Before starting
I WARNING
Put all the protective covers back
before starting the engine.
2. Start the compartment fan (if
fitted) for at least five minutes.
Otherwise, open the hold.
3. Check that there is sufficient
fuel.
4. Move the control lever to the
neutral position.
I CAUTION
Open the sea cock (if equipped)
before starting the engine. The
raw water pump impeller will be
damaged if it runs dry even for
few seconds, and may lead to
engine overheating.
Perform all of the following operations before starting the engine:
1. Open sea cock (if fitted). Prime
the raw water system if necessary.
5. Open fuel cock, prime the system if necessary.
6. Check the engine and transmission oil level and fill with the
recommended oil if necessary.
7. Check the coolant level, top up
if necessary.
8. Check the control cables,
grease the connections if necessary.
9. Check there are no fuel, oil,
coolant or water leaks.
10. Check the alternator belt.
11. Switch ON the main switches.

25
Starting the
engine
Starting using booster
batteries
I CAUTION
I DANGER
 The propeller can cause serious injury when rotating. Check
that nobody is in the water near
the propeller before starting.
 Never use a start spray or any
other equivalent product These
products are highly flammable.
I CAUTION
 Always preheat the engine.
Never race the engine while it is
cold.
 Do not crank the engine continuously for more than 10 seconds at a time. Let it cool down
for 2 minutes between cranking
attempts. Failure to follow these
guidelines may result in starter
motor burnout.
 If the engine don’t start after
3 attempts, remove the key and
drain the water in the waterlock.
Failure to do so may lead to water ingress in the cylinders.
NOTICE: When starting the engine
for the first time, let it run at idle
for several minutes and check for
leaks or malfunction.
26
Make sure to use batteries with
the same rated voltage as the
engine’s system voltage.
1. Connect the jumper cable to the
positive pole (+) of the flat battery,
then to the positive pole (+) of the
booster battery.
2. Connect the jumper cable to the
negative pole (-) of the booster
battery. Then connect the other
end of the cable to a bolt on the
clutch of the engine block.
I DANGER
On an engine with a two pole
electrical system, connect the
other end of the jumper cable
to the negative pole (-) of the
booster battery.
3. Start the engine following the
starting procedure.
4. Let the engine run at idle for
few minutes to charge the battery.
5. Stop the engine and remove
the cables in the exact reverse
order from installation.
Panel with key
Panel without key
1. Move the control lever to the
neutral position.
1. Switch the key of the main panel to ignition (if equipped).
2. Insert the key in the ON/STOP
starter switch.
2. Move the control lever to the
neutral position.
3. Turn the key a quarter-turn to
the right. All the warning lamps
come on and the acoustic alarm
sounds. After a few seconds, only
the ENGINE OIL PRESSURE
and BATTERY CHARGE LAMPS
remain lit.
3. Press the ON/STOP button. All
the warning lamps come on and
the acoustic alarm sounds. After
a few seconds, only the ENGINE
OIL PRESSURE and BATTERY
CHARGE LAMPS remain lit.
4. Press the START button
halfway to start preheating. Hold
the button for 5 to 15 seconds,
depending on ambient temperature to preheat the engine.
5. Press fully to start the engine.
Once the engine has started, release the button, all lamps go out.
6. If the engine is fit with water
cooled exhaust elbow, check
that water flows from the exhaust
outlet at the hull. If the water does
not flow, stop the engine and
check the raw water system.

27
4. Press the START button
halfway to start preheating. Hold
the button for 5 to 15 seconds,
depending on ambient temperature to preheat the engine.
5. Press fully to start the engine.
Once the engine has started, release the button, all lamps go out.
6. If the engine is fit with water
cooled exhaust elbow, check that
raw water flows from the exhaust
outlet at the hull. If the water does
not flow, stop the engine and
check the raw water system.
During operation
Manoeuvring
I CAUTION
I WARNING
Never press the START button
when the engine is running.
Shifting at high speed can damage both the engine and the
transmission and be dangerous
for passengers.
Check the instruments and warning
lamps after starting, and regularly
when cruising.
Cruising speed

A recommended engine speed is
given in the chapter TECHNICAL
DATA to help you to set your cruising speed.
NOTICE: Always consider sailing
conditions and load of the boat to
set the cruising speed.
Operating the engine at wide open
throttle should be avoided since it
is both uncomfortable and uneconomical.
I CAUTION
On a twin engine boat, both
engines should be started during
reversing manoeuvres to reduce
the risk of water ingress in the
stationary engine.
Carry out the following operations
for forward / reverse manoeuvres:
1. Reduce engine speed to idling
and, if possible, let the boat lose
most of its speed.
Note that operating the engine at
a too low rpm for a long period
could lead among other things to
increased oil consumption.
Deposits may also form in the injection system if the engine do not
reach its nominal operating temperature regularly. Run the engine at
full throttle regularly in order to burn
off any possible deposits in the fuel
system.
2. Move the control lever to the
neutral position and wait a few
seconds.
3. Move the control lever into
astern. Increase the speed.
28
Sailing with the engine
stopped
I CAUTION
 Sailing with the engine stopped and the lever in neutral must
not exceed 6 to 7 hours in a row.
The propeller can drive the rotation of the shaft and damage the
transmission. Run the engine for
15 minutes to lubricate the transmission at least every 6 hours.
 Whatever the type of propeller
and transmission, never sail with
the engine stopped in forward
gear (in ahead).
If the engine is fitted with a Sail
Drive transmission MODEL SP60,
when cruising under sail with the
engine stopped:
If the blades of the propeller are
foldable:
• Put the throttle lever astern (in
reverse). The blades are closed
when the boat moves forward.
Hydrodynamic resistance created by the blades is minimized.
If the blades of the propeller are not
foldable:
• Put the throttle lever astern (in
reverse). The propeller does not
rotate and create hydrodynamic
resistance.
• Put the lever in neutral, the
propeller rotate and create lower
hydrodynamic resistance than in
astern.
29
 Under sail, close the seacock
if the boat is able to reach a
speed above 8 knots. Water can
force one’s way through the raw
water intake and fill the exhaust
system. Don’t forget to open the
seacock again before restarting
the engine.

Stopping the
engine
After the engine has stopped:
1. Switch off the main switch.
I CAUTION
2. Close the sea cock and the fuel
cock.
Never stop the engine by using
the main switch. This could damage the electrical system.
3. Inspect the engine compartment and check for any leaks.
I CAUTION
Before stopping the engine, let it
run at idle in neutral for few minutes, especially if the engine has
been operated at high speed and
load. This will allow the coolant to
cool down the engine.
1. Start the fan in the engine
compartment (if fitted) or open
the hold.
2. Turn the key in the starter
switch counter-clockwise, the
engine stops and all indicators
turn off. The engine stops, all
lamps go out. For panel without
key, press the ON/STOP button
and release it. The engine stops.
Turn the key of the maon panel
counter-clockwise. All indicators
turn off.
I CAUTION
Even after the engine has
stopped, some components and
fluids remain hot and pressurised for several minutes. As far
as possible, limit work on the engine immediately after stopping
it, when it is hot.
30
 If the boat is being towed,
stop the engine and close the
sea cock to prevent the engine
from being filled with raw water.
 On boats with twin engine,
if cruising with a single engine,
close the sea cock of the stopped engine.
Do not forget to open the sea
cock before restarting the engine.
Anchoring
Storage
When the boat is at anchor or in
port for extended period, vegetation
may develop on the hull, the keel,
the drive, the rudder, the propeller, etc. It will significantly affect
the behaviour of the boat and the
performance of the engine if the
vegetation is not removed before
the next time the boat is used.
If the boat is being left in the water
while not in use for few weeks, the
engine must be controlled and run
few minutes every 10 days.
Vegetation and fouling can also
obstruct the raw water system and
result in damage to the engine by
overheating.
Inspect and clean the boat and the
raw water system each time the
engine is used. Clean if necessary.
If the boat is put out of water, clean
the hull and spray a coat of antifooling. Never paint the anodes.
Furthermore, when the boat is
at anchor or in port for extended
period, water can fill the exhaust
system via the exhaust outlet. It is
necessary to drain regularly the waterlock when the boat is at anchor.
If the boat will not be used for
more than 2 months, special set of
operations must be performed on
the engine and the transmission.
Refer to the chapter LONG-TERM
STORAGE.
To prevent damages due to freezing, the cooling systems (raw
water and coolant) must be drained
when there’s a risk a frost. Refer to
the corresponding chapters in the
section MAINTENANCE and to the
chapter LONG-TERM STORAGE.
ALL THESE OPERATIONS
SHOULD BE CARRIED OUT BY
A NANNI AUTHORIZED WORKSHOP.

31
7
MAINTENANCE
I WARNING
 As far as possible, perform
maintenance operations with the
engine stopped, remove the key
from the panel and turn off the
power supply.
 Read this whole chapter and
all safety precautions before
starting any maintenance work.
Make sure you understand how
to perform every operation.
This manual only describe preventive maintenance operations to be
carried out by the owner/operator
of the engine. Carrying a set of
preventive maintenance operations
in accordance with the service
intervals will ensure engine optimal
reliability and service life.
During the warranty period, it is
essential that all work is carried out
by a Nanni authorized workshop.
Furthermore, all servicing should
be registered in the Nanni aftersale system.
However, some regular checks,
particularly those made each time
the engine is used, can only be
carried out by the user. Few other
operations are explained further on
so that you can work on the engine
in an emergency or if there is no
repair centre nearby.
32
We recommend to have all your
works checked by a Nanni authorized workshop.
Independent repair and adjustment work on the engine beyond a
limited scope is forbidden for safety
reasons.
Improper work endangers the person working on the engine and the
others. Particularly operations on
valve timing and injection system.
NOTICE: The service intervals and
relevant informations concerning
the preventive maintenance of
the transmission are indicated in
the user manual provided by the
manufacturer of the transmission.
Contact your Nanni dealer for
further information regarding the
maintenance of the transmission.
The hourmeter displays the operating hours of the engine.
Service schedule
NOTICE: An operation requiring service every day requires service after
100 hours or every year, and so on. Some components may not be part of
the engine ordered.
Operations marked with  should be done in a Nanni workshop.
* Operations to perform after 20 operating hours or 45 days after commissioning.
BEFORE OPERATING THE ENGINE
 Check the engine & transmission oil level. Top up if necessary *.
 Check the coolant condition and coolant level. Top up if necessary *.
 Check the raw water filter and clean as necessary *.
 Drain water from the fuel prefilter *.
 Check the condition of the battery *.
 Check the warning lamps of the instrument panel *.
 Control and adjust general water tightness *.
 Check the stuffing box condition *.
EVERY 100 OPERATING HOURS / AT LEAST EVERY YEAR
 Clean the air filter. Change if needed.
 Change the fuel filter *.
 Check the condition and the tension of the belts. Change if needed*.
 Check the anodes. Change if needed*.
 Check and tighten the electrical connections & cables, the clamps and
screws *.
 Remove the sediment from the fuel tank and drain the fuel tank.
 Check the control unit, the condition of the cables, grease the cables *.
33
EVERY 200 OPERATING HOURS / AT LEAST EVERY YEAR.
 Change the engine and transmission oil *.
 Change the oil filters *.
 Change the fuel filters *.
 Check the raw water pump impeller. Change if needed.
 Check the engine flexible mountings. Adjust as necessary *.
 Clean the Turbo Wastegate.
 Clean and touch up the paintwork as necessary.
EVERY 400 OPERATING HOURS / AT LEAST EVERY 2 YEARS.
 Change the thermostat of the heat exchanger.
 Change the heat exchanger filler plug.
 Drain and change the coolant. Clean the coolant system.
 Check and clean the heat exchanger tube stack. Change the O-ring.
 Check and clean the air cooler tube stack. Change the O-ring. Check
and clean the transmission oil cooler tube stack.
 Check the fuel injection nozzles. Change if needed.
 Check cold valve clearance.
 Check and clean the Turbo
34
General
inspection
I CAUTION
Do not let oil, fuel or grease
deposits build up around the
engine as they may increase the
risk of fire in the engine compartment.
Make a habit of visually checking
the engine and its compartment
each time you operate the boat,
before starting the engine: check
for fuel, water or oil leaks, check
the tightness of the different clamps
and bolts, the condition of the belt,
hoses and electrical wirings, the
wear of anodes (if fitted) and the
battery electrolyte level.
Stuffing box
I DANGER
A stuffing box lubricated with
raw water taken from the engine
cooling system must never be
installed on a Sail boat or when
the exhaust elbow is below the
waterline. A separated water
supply or a stuffing box lubricated by grease must be used on
all Sail boat or when the exhaust
elbow is below the waterline.
Control cables
The engine rpm and the gearbox
shift command are controlled by
mechanical control cables connected to the control lever.
Adjust the tension of the cable if
necessary. If any defect appears
(rust, crack, etc), the control cable
must be changed.
If the boat is equipped with a braided-type stuffing box, check the
system’s tightness. As this system
is not absolutely tight, it is normal that a slight amount of water
passes through the stuffing box.
Correct operation is characterized
by a drop-by-drop water intake.
If too much water comes in, stop
the engine and contact your Nanni
dealer as soon as possible.
In any case, always make sure that
the lubrication of the stuffing box is
sufficient.
35
Exhaust system
Inspect all exhaust system components (hoses, clamps, mixing
elbow, manifold, etc.) Check for
cracks, leaks and corrosion. Tight
or change them if necessary.
Check for carbon or soot residue on
exhaust components as it indicates
an exhaust leak.
If any defect appears on component of the exhaust system, change
it as there’s a risk of exhaust
leakage or water penetration in the
engine and the boat.
Air intake
The reliability and the performances
of the engine depend among other
things on the quantity and the temperature of the intake air.
To check the air filter:
1. Remove the clamps and remove the filter.
2. Clean the inside of the filter with
dry compressed air.
3. If the air filter is damaged,
change it.
4. Install the filter with the clamps.
Make sure the clamps are tight
enough, while not damaging the
filter.
I WARNING
Carry out these operations when
the engine is stopped and cold.
Make sure that no dust or dirt
enter the intake manifold.
The air filter reduces the level of
noise made by the air intake and
prevent particles from penetrating
the intake manifold.
36


Fuel system
I DANGER
 Stop the engine and let it
cool down before refuelling or
carrying out any operation on the
fuel system.
I WARNING
 Fuel is flammable and can be
dangerous. Fuel spilled on hot
surface or near spark can burn.
 Do not step on the injection
pipes. Always make sure they
are not damaged.
I CAUTION
Total cleanliness must be guaranteed when working on the
fuel system. No impurities should
enter the injection system. Make
sure not to spill fuel on hoses.
NOTICE: All work on the fuel injection system must be carried out by a
authorized Nanni technician.
Check regularly the condition of
the components of the fuel system
(hoses, filter, clamps, etc). Change
it if any defect appears.
37
Operation of the fuel
system
The fuel is drawn from the tank by
the fuel feed pump and is injected
into the combustion chamber by the
injection pump. A fuel filter is placed
between the feed pump and the
injection pump.
The injection pump delivers a larger
amount of fuel than required for
combustion. The fuel that is not
burned is re-injected into the tank
through an over-flow pipe.
I CAUTION
The injection pump is an extremely precise unit. Water entry in
the fuel system will cause major
failure to the injection pump and
to the whole fuel system.
A fuel prefilter with a water separator should be installed between
the fuel tank and the fuel filter on
the engine. The prefilter should be
installed as close as possible to the
engine fuel filter. It must never be
installed on the engine as vibrations affect the water/fuel separation process.
If the fuel tank is located below the
engine injection pump, an additional electric fuel feed pump should
be installed between the prefilter
and the feed pump of the engine.
Fuel requirements
Fuel prefilter
Only use grade of fuels indicated
in the chapter TECHNICAL DATA.
Other grades of fuel can increase
fuel consumption and cause operating problems, resulting in a shorter
engine service life.
The fuel prefilter is an optional extra not in the scope of supply of the
engine. The model of prefilter can
vary according the boat.
Use of fuel additives can result
in poor performance or engine
damage.
NOTICE: Drain the water in the
prefilter several hours after the
engine has been stopped.
Before starting the engine, make
sure that the fuel level is above the
lower limit. If the fuel level is too
low, add fuel to the upper limit. Do
not overfill.
Use a strainer when filling the fuel
tank. Dirt and dust in the fuel will
cause trouble in the fuel injection
system.
If the boat is not used for an extended period, fill the tank to the
maximum level.
1. Close the fuel cock on the fuel
tank.
2. Place a container under the fuel
prefilter. Drain water and remove
impurities using the cock/plug.
3. Tighten the cock/plug once the
water has been drained.
4. Check the filtering element,
change it if necessary.
5. Open the fuel cock.
6. If the filtering element has been
changed, bleed the fuel system.
Start the engine and check for
leaks.
38
Replacing the fuel filter
Air bleeding
NOTICE: Do not fill the new filter
with fuel before assembly.
Bleeding the air in the fuel system
is necessary :
• After a maintenance operation
on the fuel system.
• If the fuel tank has been emptied.
• The engine has not been started
for a long time.
To bleed the fuel system IF IT IS
NOT FITTED with an electric pump:
1. Fill totally the fuel tank. Open
the fuel cock.
1. Close the fuel cock. Clean the
filter bracket. Put a plastic bag
over the filter to prevent leakage
on the engine.
2. Loose the venting screw
. Use rags around the venting
screw.
2. Remove the fuel filter
filter wrench if needed.
3. Pump the fuel using hte lever
until fuel free of air bubbles
flows from the venting screw.
. Use a
3. Check and clean the sealing
surface of the filter bracket. Apply
film of fuel on the seal.
4. Screw the new filter by hand
until the seal touch the matting
surface. Screw a further half turn.
5. Open the fuel cock and bleed
the air in the fuel system.
39
NOTICE: If the lever is too hard
to operate, turn the crankshaft a
fraction of a turn.
4. Continue pumping and at the
same time tighten the venting
screw.
5. Pump few other times to prime
the system.
To bleed the fuel system IF IT IS
FITTED WITH AN ADDITIONAL
ELECTRIC FUEL FEED PUMP :
1. Fill totally the fuel tank. Open
the fuel cock.
2. Loose the venting screw
. Use rags around the venting
screw.
3. Start the engine for 5 to 10 seconds to let the electric fuel feed
pump bring fuel to the injection
pump.
4. Pump the fuel using the lever
until fuel free of air bubbles
flows from the venting screw.
5. Continue pumping and at the
same time tighten the venting
screw.
6. Pump few other times to prime
the system.
I CAUTION
Avoid draining all fuel in the filter

40
Lubrication
system
I DANGER
Carry out these operations with
the engine stopped and cold.
Remove the key and switch off
the main switch to prevent accidental starting. Hot oil and hot
surfaces can burn.
The oil level should be within the
range indicated on the dipstick,
between the Mini and Max level.
To check the oil level:
1. Remove and wipe the dipstick.
2. Re-insert and remove the
dipstick. Check that the oil level is
between the Mini and Max mark.
Mini
Max
I CAUTION
 Never operate the engine if
the oil crankcase has been overfilled. Drain the oil if too much oil
has been added.
 Observe the recommended
type of oil for the transmission.
NOTICE: With a new or reconditioned engine, oil and oil filters
must be changed after 20 hours of
operation. Use oil grades quality
indicated in the chapter TECHNICAL DATA. Warranty claims may
be rejected if unsuitable oil grade
has been used.
The viscosity may be adapted depending the climatic conditions.
Oil level- Adding
engine oil
Check the engine and transmission
oil level before starting the engine.
Always make sure that the level is
in the safe range.
41
If the level is too low, remove the oil
filler plug and add oil slowly. Wait
few minutes before checking the oil
level to let the oil drain down to the
oil pan.
I CAUTION
Do not fill the crankcase above
the maximum level indicated on
the dipstick. Do not operate the
engine if the oil level is below
the Mini mark or above the Max
mark.
NOTICE: Completely drain the previous oil before adding new engine
oil. Never mix different type of oil.
Draining the engine oil
Changing the oil filter
1. Start the engine and let it warm
few minutes so that oil suction is
easier.
Change the oil filter each time the
engine oil is drained.
2. Stop the engine and remove
the key from the panel.
3. Connect a disposal hose to the
drain pump and place a container
under the disposal hose.
1. Remove the oil filter with a filter
wrench. Turn the filter counterclockwise. Remove the gasket.
2. Clean the mating surface in
order to prevent impurities from
entering the engine.
4. Suck out all the oil using the oil
drain pump. Remove the drain
hose and lock the pump.
3. Apply a film of oil on the new
gasket. Screw the new filter by
hand with the new gasket. When
the gasket contacts the mating
surface, turn the filter a half turn.
4. Fill with correct amount of new
oil. Check for leaks and check the
oil level.
5. Start the engine and let it operate few minutes at idle. Check
that the oil pressure warning lamp
goes out.
6. Stop the engine, wait for the engine to cool down and check the
oil level. Top up if necessary. 
42
Cooling system
Overview
The cooling system cools the engine in order to maintain a proper
operating temperature and prevent
overheating. On some engines, the
cooling system also cools the fuel,
the oil or the intake air. The cooling
system is made of two circuits:
• The COOLANT CIRCUIT which
is the engine’s internal cooling
system. It’s a closed-circuit in
which coolant flows and cools the
engine.
• The RAW WATER CIRCUIT
which cools the coolant via heat
exchange with raw water. Nanni
engines comes as standard with
an heat exchanger, in which
the coolant is cooled by heat
exchange with raw water taken
from a sea cock. A Keel Cooling
system can also be used to cool
the coolant instead.
I CAUTION
 Engines with heat exchanger
are not suitable for a Keel Cooling system.
 Operating the engine without
coolant or raw water supply,
even for few seconds, will lead to
complete engine failure.
Operation principle of
the cooling system
Operation principle of an engine
with heat exchanger:
Exhaust elbow
Heat exchanger
Recovery tank (if fitted)
Coolant pump
A thermostat maintains the coolant
at a proper and constant operating temperature. With thermostat
control, the coolant only enter the
heat exchanger when the engine
reach a certain temperature.
Engine
Thermostat
Raw water
pickup
Engine raw
water pump
43
Raw water
filter
Coolant
I CAUTION
 Always use coolant made of
50% antifreeze with anticorrosion additive and 50% of clean
water. The antifreeze protects
the engine against internal corrosion.
 This mix must be used all year
around, even if there is no risk of
frost.
 Never use water alone to
completely fill the coolant system.
CLEAN WATER
Use clean soft water, distilled water
or tap water to mix with antifreeze.
Natural water generally contains
minerals and sometimes salt, which
can oxidize metal and accelerate
corrosion process.
Choose additive that will not have
any adverse effects on the materials of the cooling system. Never
mix different additive as it may
cause chemical reactions and therefore malfunctions.
WATER BOILER
A water boiler can be connected to
the engine coolant circuit.
If the boiler is located above the
engine, an additional recovery tank
must be installed above the boiler.
The amount of coolant must be
adapted depending the model of
water boiler to completely fill the
coolant system.
COOLANT EXPANSION
When it heats, the coolant expands
and takes up a higher volume.
A recovery tank mounted on the
engine allows to compensate this
expansion.
ANTI-FREEZE
I CAUTION
Never use poor quality antifreeze.
The main components of the antifreeze can corrode metal, gathering
rust in the cooling system over
an extended period. Poor quality
antifreeze has poor content of
corrosion preventive. The content
further becomes less potent with
the dilution of water.
44
The recovery tank mounted on
the engine must never be moved
from its original location without
prior authorization from Nanni
Industries S.A.S. France.
Coolant level
I DANGER
Never open the coolant filler cap
or any plug of the cooling system
when the engine is operating
or warm. Steam or hot fluid can
spray out.
Always check the coolant level
before starting the engine.
1. Stop the engine and remove
the key from the panel.
2. Turn the coolant filler cap
slowly to the first stop and let any
pressure escape from the system
then remove the cap.
3. Coolant level should lie
between the filler neck lower
edge and the level spur.
4. Top-up using clean water only.
5. Reinstall the coolant filler cap.
6. Check the coolant level in the
recovery tank (if fitted). It should
lie between the Min and Max
mark of the recovery tank. Add
clean water if necessary.
NOTICE: The Min and Max level
indicated on the recovery tank (if
fitted) does not indicate the correct
level of coolant.
Draining the coolant
circuit
1. Stop the engine and remove
the key from the panel.
2. Put a container under the heat
to collect
exchanger drain plug
coolant.
3. Remove the cap
plug .
and the
4. Drain off all coolant. Drain off
the recovery tank and the hoses.
5. Insert a hose into the heat
exchanger filler port . Rinse
with fresh water until water which
flows from the drain port
is
clean.
and
6. Reinstall the drain plug
fill with coolant to the correct
level.

45
Coolant - Filling
Mix the anti-freeze with water in a
clean container before filling the
heat exchanger. The coolant must
be totally free from dust. Fill the
exchanger slowly not to introduce
air into the coolant system.
Refer to the chapter TECHNICAL
DATA to know the coolant capacity
of the heat exchanger. For Keel
Cooling system or when using a
water boiler, the coolant capacity
must be adapted according to the
pipes length and the tank capacity.
To fill the coolant system :
1. Remove the vent plugs
.
and
2. Remove the coolant filler cap
and fill the exchanger with coolant.
3. Replace the vent plugs when
coolant runs out from the drain
openings.
4. Fill the exchanger with coolant
to the correct level.
46
5. Replace the coolant filler plug
and add coolant in the recovery
tank if necessary.
6. Start the engine and let it operate few minutes at idle.
7. Stop the engine. Wait few
minutes and check the coolant
level. Top up if necessary.


Raw water system
I DANGER
When the boat is in the water,
water can flow into the boat via
components located below the
waterline. Close the raw water
cock (if fitted) or prevent water
discharge before working on this
raw water system.
The raw water system allows to
cool the engine coolant and the
exhaust gas.
Raw water is drawn into the heat
exchanger by the raw water pump
of the engine. The raw water is
discharged via the exhaust elbow,
where it is mixed with exhaust
gases.
Engines designed for a Keel Cooling system are generally not fitted
with raw water system components
(raw water cock, heat exchanger,
etc). In Keel Cooling system, the
coolant heat is dissipated by passing through tubes incorporated to
the hull.
NOTICE: If there’s any risk of
frost, raw water system should be
drained.
47
Siphon breaker
I DANGER
Close the sea cock before any
operation on the siphon breaker.
NOTICE: The use of a siphon
breaker is mandatory if the exhaust
elbow is under the waterline at full
load or at less than 200 mm above
it. A siphon breaker is mandatory in
all Sail Boat and when there’s a risk
of water entry in the engine.
The siphon breaker prevents raw
water entry into the cylinders via
the raw water/exhaust system.
To operate correctly, the siphon
breaker should clean twice a season, or when leakage appears.
I CAUTION
A faulty operation of the siphon
breaker will lead to water entry in
the engine.
Inspect it regularly and clean it following the instructions given by the
manufacturer.
Raw water pump impeller
I CAUTION
If the engine has been run without supply of raw water, check
the raw water pump impeller.
Change it if needed.
The raw water pump impeller is an
essential component of the engine.
It should be changed regularly
along with the seal. A worn impeller
could crack and damage the cooling system. Always have a spare
raw water pump impeller on board.
NOTICE: The service life of the raw
water pump impeller vary depending the operating conditions.
To extract the impeller:
4. Mark the position of the neoinside the
prene impeller
pump in order to install it in the
correct position in case of reinstallation.
5. Carefully remove the impeller
using an extractor.
6. Inspect the impeller. Check for
damaged, cracked, broken missing or flattened vanes. Change
the impeller if it is damaged.
Clean and drain the raw water
system if parts of the impeller are
missing.
7. Inspect the cover and the
gasket for corrosion or damage.
Change it if they are damaged.
8. Lubricate the inside of the
pump and the cover with waterproof grease for rubber.
9. Install the impeller. If reinstalling
the old one, place it at the same
location using the mark done
previously. Rotate the impeller in
the same direction as the engine
rotation. Lubricate the impeller
with waterproof grease for rubber.
10. Install the gasket and the cover
on the pump housing.
1. Stop the engine, remove the
key from the panel and close the
sea cock.
11. Open the sea cock, check for
leaks. Prime the raw water system by adding water through the
raw water filter if necessary.
2. Remove the cover of the raw
water pump.
12. Start the engine and check for
leaks.
3. Remove the gasket
48
.
Cleaning the raw water
filter
A raw water filter must be fitted
between the raw water intake and
the raw water pump of the engine.
The model of prefilter can vary
according the boat as the raw water
filter is an optional extra not in the
scope of supply of the engine.
These instructions are given as an
example only.
Raw water system 
Draining
I WARNING
It is highly recommended to
carry out these operations when
the boat is laid up on land. If the
boat cannot be removed from
the water, close the sea cock
and prevent water entry by any
means.
Check the raw water filter more
regularly than indicated in the service schedule if the boat is used in
water with lot of dirt and/or mud.
1. Stop the engine, remove the
key from the panel and close the
sea cock.
To clean the filter:
2. Remove the cover of the raw
water pump.
1. Stop the engine, remove the
key from the panel and close the
sea cock.
2. Check the condition of the raw
water filter. If deposits have formed, screw off cover and remove
seal plate.
3. Remove all the contaminants.
Rinse the filter and the housing
with fresh water and check the
condition of the seal.
4. Reinstall all the components
and open the sea cock. Start the
engine and check for leaks.
NOTICE: When the boat is out of
water, check that the through-hull is
not obstructed by mud or algae.
49
3. Remove the cover and the seal
from the raw water filter.
4. If a siphon breaker is fitted,
drain it following the manufacturer
recommendations.
5. Drain the cooling system of the
transmission lubrication circuit (if
fitted).
6. Drain the waterlock and any
other equipment connected to the
raw water and exhaust system.
7. Reinstall correctly all components. Open the sea cock and
check for leaks. Prime the raw
water system by adding water
through the raw water filter if
necessary.
Raw water system Cleaning and inhibiting
The raw water system must be
flushed with fresh water to prevent
the buildup of deposits and salt
crystals in the circuit. It must also
be protected against corrosion and
frost when performing long-term
storage.
1. Stop the engine and close the
sea cock.
2. Disconnect the hose on the
outlet side of the raw water filter.
3. Place the free hose in a container filled with fresh water. Ensure
the tank is large enough as the
raw water pump must never be
run without water.
4. Check that no one is in the
vicinity of the engine, the propeller and the exhaust outlet. Put
the lever in neutral and start the
engine.
5. Let the engine run few minutes
at idle. Add fresh water in the
container if necessary.
6. Stop the engine.
7. Fill the container with engine
coolant mix (50% clean water,
50% anti-freeze).
8. Start the engine and let it run at
idle. Add enough coolant to fill the
raw water system with coolant.
9. Stop the engine before the
container is empty.
50
10. Reconnect the hose.
11. Drain the coolant before the
next time the engine is used.
I WARNING
Check for leaks before the next
engine start.
I CAUTION
When preparing the engine for
long term storage, if the engine
is likely to be subject to frost,
drain all water and coolant in the
cooling systems.

Electrical system
I DANGER
Stop the engine and switch off
the main switches to break the
current before working on the
electrical system. Isolate shore
current to any accessories
mounted on the engine.
I CAUTION
The main switch should always
be switched ON when the engine
is operating. Never disconnect
the lead between the alternator
and the battery when the engine
is operating.
Fuses
The engine electrical system is
protected from electrical overload
damage by fuses.
If the electrical system does not
work, the engine does not start or
the instruments panel don’t operate, a fuse may have trip.
Investigate the cause before resetting the fuse. Always have spare
fuses on board. Replace a blown
fuse with one of the same rating.
I CAUTION
If the replacement fuse blows,
this indicates an electrical
problem. Don’t start the engine,
except in case of emergency,
and contact a Nanni workshop.
Wires and connectors
Check that electrical wires and
connectors are dry and in good
conditions.
The engine extension harness
should be away from any water
projection and must be correctly
attached as high as possible in
the hold. Change it if any defect
appears.
Tighten the cable terminals and
lubricate them with appropriate
grease.
51
Boats with metallic
hulls
Engines in metallic hulls are generally fitted with a two-pole electrical
system. This system allows to electrically isolate the engine from the
electrical ground of the boat.
Contact your Nanni dealer for more
informations.
Battery
I DANGER
 Never touch the battery
electrolyte. The diluted sulphuric acid solution burns skin and
make holes in clothing. Should
this occur, immediately wash
it off with plenty of clean water
and obtain medical assistance
without delay.
 Disconnect the battery leads
before carrying out any soldering
work on metallic hull.
Always read the manufacturer
recommendations before operating
the battery.
Battery should be kept clean and
dry. Oxidation or the deposit of
impurities on the battery and on its
terminals may lead to short circuits, voltage drops and premature
discharging, notably in wet weather.
Use a brass brush to clean battery
terminals.
When DISCONNECTING the
cables, always disconnect FIRST
the NEGATIVE LEAD (-), and then
the POSITIVE (+).
Always CONNECT FIRST the
POSITIVE LEAD (+) to the POSITIVE TERMINAL (+) of the battery,
and then the NEGATIVE (-).
Use distilled water to top up the
electrolyte level. Follow in priority
the battery manufacturer instruc52
tions for topping up. If the battery
electrolyte level is not adjustable
(maintenance free battery type), do
not use or charge the battery if the
fluid level stands below the lower
limit level.
When adding electrolyte, unscrew
the vent plugs but leave them in
their holes.
I DANGER
Check that the battery compartment is well drained and ventilated. When charging, battery
produces hydrogen which is
extremely explosive.
If the battery is replaced, use a
battery with similar specifications to
the previous one.
To simultaneously charge tow
independent battery with a single
alternator, an isolator is available as
an option on most engines. Contact
an authorized Nanni dealer.
BATTERY STORAGE
When storing the engine, adjust the
battery electrolyte level and store it
in a dry place. Recharge the battery
as often as possible to extend its
service life.
Alternator belt
To adjust the belt tension:
I DANGER
Stop the engine and remove the
key before servicing the alternator belt.
Always keep a replacement belt
on-board.
The alternator belt drives both the
coolant pump and the alternator.
Additional belt can also be fitted.
A loosen or damaged belt can
result in overheats or insufficient
alternator charging. A belt that is
too tight can damage the bearings
in the pump and the alternator.
Visually check the belt for excessive wear, frayed cords, etc. If any
defect has been found, change the
belt. Check that it fits properly in
the pulley.
Also check its tension. The deflection must be of between 8 to 10
mm when pressing the belt with the
hand between two pulley when the
belt is warm.
53
1. Stop the engine and remove
the key from the panel.
2. Loosen the alternator mounting
bolt
and pull the alternator out
until to adjust the deflection of the
belt.
3. Tighten the alternator mounting
bolt.
4. Check the tension after few
hours of operation.

Corrosion
protection
The engine and all metal item in the
boat that are exposed to water or
damp can be damaged by corrosion.
There are two main categories of
corrosion, which can be cumulative:
galvanic corrosion and electrolytic
corrosion. Both corrosion processes are a result of electric current that flow between metal items
in an electrolyte such as water.
Galvanic corrosion
Galvanic corrosion is an electrochemical reaction that create electrical
current between dissimilar metals
exposed to water. This current will
corrode the more anodic metal.
Several factors, cumulative or not,
can worsen this effect:
• High saline and/or mineral
concentration in water.
• High water temperature (>25°C).
• When cruising at high speed or
when there’s a strong current.
• Important relation difference
between the cathode and anodic
surfaces.
Anodes in magnesium or zinc are
generally used to protect the boat
against galvanic corrosion. Due to
their intrinsic nature, these anodes
54
will wear down in place of other
metallic components.
During the first year of use, check
the anodes deterioration every 3
months. During prolonged mooring near other boats or dock side,
control the wear and tear of the
anodes at shorter intervals. In that
case, the use of additional corrosion protection might be necessary
during prolonged mooring.
Depending upon operating conditions and water properties, it might
be necessary to check and/or
replace the anode more frequently.
I CAUTION
The anodes must never be
painted or damaged. They must
be changed as soon as they are
corroded of more than 50%.
Electrolytic corrosion
Electrolytic corrosion is caused by
externally generated DC electrical
currents that pass through a metal
item to another in an electrolyte
such as raw water. Electrolytic
corrosion is especially due to circuit
leakage currents, shore power systems or DC ground faults.
The consequences are the same
as galvanic corrosion. However,
the protective measures against
galvanic corrosion are only partially
effective against electrolytic corrosion.
To protect the engine against
electrolytic corrosion, the following
recommendations should always
be followed:
• Electric cables must never be
exposed to water or damp. They
must be clamped and free from
any mechanical constraints.
I DANGER
For engine with a two-pole
electrical system, the negative
pole of the battery must never
be connected to the common
ground of the boat.
I CAUTION
The Sail Drive model SP60 is
electrically isolated from the
engine. Never connect the Sail
Drive SP60 to the common
ground or to any metal item or
electrical equipment.
• A main switch must be connected to the positive circuit (+) of
the battery. This switch must be
switched off when the boat is not
in use to cut off the power to all
equipment.
I WARNING
• If the boat is connected to shore
power, the protector ground
must never be in the boat. Shore
power should always have a
ground fault circuit beaker.
• Shore power units must be intended for marine usage.
• All equipment fitted with a protective ground terminal, the engine
along with the anodes must be
connected to the common ground
of the boat.
55
Never switch off the power of
a corrosion protection system
powered by a battery.
Engine anode
In order to protect the engine and
its raw water system from corrosion, the engine is fitted with a zinc
anode.
5. Remove the deposits from the
surface of the anode using glass
paper before determining the
level of erosion. Do not use a soft
steel brush as this could leave
deposits that are likely to speed
up corrosion.
6. If more than 50% of the anode
has been used up, change it
along with the seal.
The length of a new anode is 16
mm.
I CAUTION
Screw the anode cap back on
tightly and do not forget to reopen the sea cock.
Intervals given in the service schedule are recommendations. Depending upon operating conditions and
raw water properties, it might be
necessary to check and/or change
the anode more frequently.
To remove the anode:
I WARNING
Carry out these operations when
the engine is stopped and cold.
1. Remove the key from the panel.
2. Close the sea cock.
3. Drain the raw water system.
4. Remove the set formed by a
cap, a seal and the anode.
56

Long term
storage
Long term storage
procedure
A set of operations must be performed to prepare and protect the
engine for a long-term storage.
Complete the nearest periodic
maintenance inspections and operations before performing the long
term storage procedure.
Refer to the corresponding chapter
in the MAINTENANCE section to
perform some of these operations.
We recommend that you have all
these operations carried out by a
Nanni authorized workshop.
NOTICE: It might be necessary to
adapt these operations depending
the climatic conditions. Contact
a Nanni authorized workshop for
further informations.
For prolonged storage (>12
months), a specific set of measures
must be performed. All these operations should be carried out by a
Nanni authorized workshop.
I CAUTION
 If the engine is likely to be
subject to frost, drain all coolant
and water in the coolant and
seawater circuits. Indicate by
any means that there is no coolant in the engine.
1. Drain and change the engine
and transmission oil.
2. Change the engine oil filter.
3. Change the fuel filter and prefilter.
4. Run the engine to normal operating temperature.
5. Stop the engine and take the
boat out of water.
6. Drain, clean and inhibit all components of the seawater system.
7. Remove the impeller from the
seawater pump (if fitted). Store it
in a cool and dry place. Indicate
by any means that the impeller
has been removed.
8. Check the engine coolant level
and condition. Top up if necessary.
9. Drain any water and contaminants from the fuel tank.
10. Fill totally the fuel tank.
11. Remove the air filter. Secure all
air intake with clean clothes.
12. Clean the engine. Repair any
damaged areas of paintwork with
Nanni original paint.
57
I CAUTION
6. Remove cloth and tape from
openings. Install the air filter.
Do not point a high pressure
water jet toward seals, hoses,
grommets, etc.
7. Close/Tighten all plugs and
drain cocks.
13. Clean the hull, the hold and the
drive (if fitted).
14. Check all control cables. Use
grease and rust inhibitor to protect the cables.
15. Disconnect battery leads. Adjust electrolyte level if necessary.
Charge the battery. Store the
battery in a dry place.
16. Release belts tension.
17. Spray the engine with water-repellent product.
18. Remove the propeller for storage. Check the overall condition
of all components of the propulsion system.
Restarting the engine
1. Perform external cleaning of the
engine and control its condition.
2. Drain and change the engine
and transmission oil.
3. Change oil filters.
4. Drain the coolant from the
seawater system.
5. Check the condition of the raw
water pump impeller. Change it if
needed. Install the impeller.
58
8. Check the condition of hoses
and clamps.
9. Check the engine coolant level
and its condition. Top up if necessary.
10. Connect fully charged batteries.
11. Check the anodes.
12. Install the propeller.
13. Check the operation of the
control cables and their condition.
14. Check belts. Adjust the tension.
15. Bleed the fuel system.
Once the boat is in the water:
16. Open the sea cock and prime
the seawater system (if fitted).
17. Start the engine. Check for
leaks and correct operation.

8
TROUBLESHOOTING
If the engine does not function properly, use the following chart to identify
the cause. If the cause of trouble can not be found, contact a Nanni authorized workshop.
NOTICE: Some components may not be part of the engine ordered. This
list is not exhaustive and is only an assistance in case of emergencies.
PROBABLE CAUSES
The engine fails to start
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
13
The engine starts but suddenly stops
1, 2, 3, 4, 5
The engine is difficult to start
1, 2, 3, 4, 5, 6, 8, 9
The starter motor is not turning or turn
slowly
8, 9
The starter motor turns but the engine
does not start
1, 2, 3, 4, 5, 6, 7
The engine does not reach its rated
speed at wide open throttle
2, 3, 4, 5, 6, 7, 12, 14, 15, 16,
17, 26, 28
The engine operate unevenly
1, 2, 3, 4, 5, 6, 7, 14, 15, 16,
17, 18, 19, 20, 24, 28
The engine vibrates a lot
16, 27
Black exhaust smoke
4, 5, 14, 15, 16, 19, 20, 28
White exhaust smoke
4, 5, 23, 25
High fuel consumption
4, 7, 14, 15, 16, 19, 20, 22, 28
The engine overheats / coolant temperature too high
14, 15, 16, 18, 19, 20, 21, 22,
28
The control lever is hard to operate
12, 14, 15, 16, 17, 26
No shift between ahead and astern
9, 11, 12, 16, 17, 26
Battery charge warning lamp comes on
8, 9, 11, 18
The numbers refer to the possible causes indicated on the following page. *
Contact a Nanni authorized workshop.
59
1. Lack of fuel
2. Air in fuel system
3. Fuel filter fouled or clogged
4. Fuel do not meet specified standard
5. Water/contaminants in fuel
6. Valve clearance is wrong *
7. Low compression *
8. Insufficient battery charge / Defective battery
9. Faulty electrical cables contact
10. Faulty starter or starter switch *
11. Tripped fuse / Main switch is open
12. Transmission is damaged*
13. Control lever not in neutral / Stop control pulled out
14. Too much load on board
15. Fouling on underwater hull, drive or propeller
16. Defective/incorrect propeller *
17. Faulty operation of control lever / control cables
18. Loosen or damaged belt
19. Incorrect coolant / Low coolant level / Coolant leaks
20. Cooling system does not operate correctly *
21. Faulty thermostat *
22. Sea cock valve closed / Raw water filter clogged
23. Lube oil burns. Excessive oil consumption *
24. Engine oil level too low
25. Engine oil level too high
26. Transmission oil level too low
27. Defective engine mounting *
28. Insufficient air supply *

60
9
TECHNICAL
MODEL
DATA
N3.30
N4.38
ENGINE CHARACTERISTICS
Type
4 strokes Diesel
Max. power - kW (hp)*
21.3 - 29
27.6 - 37.5
Nombre de cylindres / Arrangement
3 in line
4 in line
1123
1498
Displacement (cm3)
Bore and stroke (mm)
78 - 78.4
Air intake
Natural
Compression ratio
22.6
Idle speed - clutch disengaged
(rpm)*
930
850
Rated engine speed @ Max power
(rpm)*
3600
3000
Max RPM at wide open throttle
(rpm)*
3820
3220
2880 ~ 3240
2400 ~ 2700
136
139
Recommended cruising speed (rpm)
Weight without gearbox (kg)
Valve clearance (engine cold) - intake (mm)
0,145 ~ 0,185
Valve clearance (engine cold) - exhaust (mm)
0,145 ~ 0,185
Direction of rotation, view from
flywheel
61
Counter clockwise
MODEL
N3.30
N4.38
ELECTRICAL SYSTEM
Recommended starter battery capacity (Ah)
65 ~ 75
Starter (kW)
1,4
Standard Alternator (V-A)
12 - 100
FUEL SYSTEM
Injection system
Injection timing before TDC (°)
Indirect (E-TVCS)
18
Fuel injection pressure (bar)
Specific fuel consumption (g/kWh) at
wide open throttle
Fuel requirements
17
137.3
292
291
EN 590 / ASTM D975 No.2-D
Never use fuels that have sulfur
content greater than 1.0 %
LUBRICATION SYSTEM
Oil quality
API CF mini
Oil viscosity (temperate climate)
SAE 15W40
Engine oil capacity with filter - no
engine inclination (litre)
4.5
5.5
Min oil pressure at rated rpm (bar)
3.5
3.5
Coolant capacity - no engine inclination (litres)
4
5
Coolant pump flow rate at rated rpm
(l/min)
60
50
Raw water pump flow rate at rated
rpm (l/min)
38
32
COOLING SYSTEM
62
Note
63
NANNI INDUSTRIES SAS
11,Avenue Mariotte-Zone Industrielle
33260 La Teste France
Tel: + 33 (0)5 56 22 30 60
Fax: +33 (0)5 56 22 30 79
Email: [email protected]
www.nannidiesel.com
P/N 970316083
082013.IndA
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