Nanni QMS 32T User manual

MARINE GENERATING SET
INSTRUCTION MANUAL
MU_GE_970315535_ENG
QMS 32T
QMS 39T
QLS 32T
QLS 39T
QLS 47T

Contents
3
Safety precautions ...................................................................................................................3
Presentation ..............................................................................................................................6
Fuel supply ......................................................................................................................................6
Environmental responsibility............................................................................................................6
Spare parts ......................................................................................................................................6
Identification numbers .....................................................................................................................7
About the generator.........................................................................................................................7
Checks before commissioning ........................................................................................................7
Principal parts of the generating set .....................................................................................................8
Instrument panel ...................................................................................................................................10
Technical characteristics .........................................................................................................11
Operation of the generating set ..............................................................................................12
Before starting ......................................................................................................................................12
Starting the generating set ...................................................................................................................12
During operation ...................................................................................................................................13
Stopping the generating set ................................................................................................................13
Maintenance ..............................................................................................................................14
Daily checks .........................................................................................................................................15
Air lter .................................................................................................................................................15
Fuel system ..........................................................................................................................................16
Bleeding the fuel circuit ...................................................................................................................16
Replacing the fuel lter ....................................................................................................................16
Replacing the fuel prelter...............................................................................................................16
Draining the water from the fuel prelter .........................................................................................16
Lubrication system ...............................................................................................................................17
Checking the oil level ......................................................................................................................17
Draining the engine oil.....................................................................................................................17
Replacing the oil lter cartridge .......................................................................................................17
Cooling system - Coolant .....................................................................................................................18
Draining and rinsing the cooling circuit............................................................................................18
Coolant lling ...................................................................................................................................18
Cooling system - Seawater ..................................................................................................................19
Cleaning the seawater lter .............................................................................................................19
Draining and rinsing the seawater circuit ........................................................................................19
Replacing the seawater pump rotor ................................................................................................19
Engine electrical system .......................................................................................................................20
Alternator belt ..................................................................................................................................20
Check the electrolyte level ..............................................................................................................20
Generating set storage procedure ........................................................................................................20
Installation recommendations.................................................................................................21
Troubleshooting .......................................................................................................................22

4
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 your generating set and make sure you take
the necessary precautions to protect yourself, those
around you and your equipment.
This manual contains important safety indications and
information.
They are as follows:
I Warning! : This symbol indicates the risk of acci-
dents and serious personal injury, substantial property
damage or serious mechanical faults if the instructions
are not followed.
I Caution! : Indicates a risk of personal injury and/or
property damage when handling a component.
Notice: Indicates that important information must be
known in order to facilitate handling or in particular cas-
es.
Using and handling a generating set entails risks that
could prove to be extremely dangerous. Some work
requires specic knowledge and equipment. This work
should be carried out by Nanni Diesel authorised per-
sonnel or by a professional. If you have to work on the
generating set, carefully follow the safety instructions
set down in this manual.
Certain information is displayed directly on the generat-
ing set in the form of icons. This information helps you
to quickly identify the location of certain components
and avoid possible hazards when working on the set.
Ensure these indications are always visible and replace
them if necessary.
Indicates that it is essential to
read the instructions carefully
before handling the generating
set.
Indicates electrical hazards.
This icon indicates a risk of re.
Stipulates that you are strongly recom-
mended against smoking and producing
ames or sparks in the vicinity.
Indicates an area containing pressu-
rised uids.
Indicates the hazardous rotating parts.
Indicates the de-aeration orice(s) (air
bleed)
Indicates where to check the coolant
level
Indicates where to check the engine oil
level.
Indicates the coolant drain orice.
Indicates the oil drain orice.
Safety precautions
Indicates the hot parts entailing sub-
stantial risks of burns.

I Exhaust gas
Exhaust gases contain carbon monoxide. This colour-
less and odourless gas is extremely harmful and could
lead to poisoning which could result in loss of conscious-
ness or death. The rst 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 generating set
experiences any of these symptoms, leave the area of
operation of the generating set and nd fresh air. If the
symptoms persist, consult a doctor and have your gen-
erating set checked.
I Risk of electric shock
Never touch the electrical connectors when the gener-
ating set is operational. The voltage at the connector
terminals can be lethal.
Do not work on the generating set without protection:
protective goggles and gloves, insulating blankets etc.
Always disconnect the generating set and cut the cur-
rent before working on the electrical system. Isolate the
shore power supply to all the electrical circuit equip-
ment.
Ensure your clothing and skin is not damp or sweaty
when handling electrical equipment. Remove watch-
es, bracelets and jewellery when working on electrical
equipment.
Handling a capacitor that is still charged can be danger-
ous and cause electrocution.
I Risk of burns
Never touch the hot parts of the generating set or the
exhaust circuit.
An operational generating set gets very hot: the exhaust
elbow and pipe, turbocompressor, starter, oil sump, oil,
coolant in the hoses and pipes are hot and can burn.
Always check the coolant level before starting the gen-
erating set.
Fluids ejected under pressure can cause serious injury.
Release all the pressure in the circuits before removing
the caps.
Never open the coolant and oil circuit caps when the
generating set is operational and/or hot.
Never start or run the generating set when the oil ll cap
is not screwed on as hot oil could spray out.
If you come into contact with any of these uids, consult
a doctor immediately.
If the generating set gets too hot, switch it off and dis-
connect it and wait for it to cool down before handling.
I Risk of re
Do not smoke near the generating set and keep it away
from sources of ignition (ames or sparks) or any other
potential ammable vapour or liquid sources.
Do not run the generating set without an air lter.
Do not run the generating set in an area in which am-
mable or explosive materials are stored or where gas is
present. Ensure there are no ammable liquids in the
engine compartment.
Immediately clean up any liquids spilled over yourself or
the oor and keep the engine compartment clean and
accessible so as to minimise the risk of re. Be careful
as fuel can burn.
I Risk of explosion
Explosions caused by fuel vapour can cause serious
injury! Carefully follow the safety rules when lling the
fuel.
Open and ventilate the storage area of the generating
set after lling. Check that there are no fuel vapours or
leaks before starting the fan (if tted). Switch the fan on
for 5 minutes before starting the generating set.
All fuel vapours are ammable and explosive. Be care-
ful when handling and storing fuel. Store the fuel in a
ventilated area away from sources of ignition (sparks or
ames) and out of the reach of children.
Stop the generating set before lling with fuel or lubri-
cant. Do not smoke near the generating set and keep it
away from sources of ignition (ames) when lling 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 extin-
guisher to hand.
Safety precautions
5

I Accidental starting
Accidental starting can cause serious injury and even
death!
Disconnect the battery before working on the generat-
ing set.
Ensure no one is alongside the generating set or work-
ing on the set before starting it.
Ensure all the protection mechanisms are in place be-
fore starting the generating set.
I Risk of battery explosion
A battery explosion can cause serious injury and even
death!
Do not smoke near the batteries and keep them away
from sources of ignition (ames or sparks). They pro-
duce hydrogen which could ignite or explode on contact
with an electrical arc or a ame. Switch off all electrical
appliances in the vicinity when you are working on the
batteries. Ensure the battery storage compartment is
corrected ventilated.
Avoid touching the battery terminals with metal tools so
that no sparks are created which could cause an ex-
plosion. Remove your rings, bracelets and necklaces
before handing the batteries.
I 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 thor-
oughly in fresh water and consult a doctor.
I Exhaust gas
Ensure the exhaust circuit correctly expels the gas pro-
duced by the generating set.
Regularly check that the exhaust circuit is free of leaks
and that the exhaust elbow is correctly afxed.
Operate the generating set in a well aerated and ven-
tilated area away from other people. Run the fan when
the generating set is operational.
I Rotating parts
Rotating parts can be extremely dangerous and cause
serious injury and even death!
Do not work on the generating set when it is operational.
If work on the engine when running is absolutely neces-
sary, 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 generating set.
Check that the bolts and screws are properly tightened
and that the protection mechanisms are in place.
Do not check the uid levels or tension of the alternator
belt when the generating set is operational.
I Lifting the generating set
To lift the generating set, use the hoisting eyes on the
appliance.
Always check the robustness and overall condition of
the lifting equipment. Use suitable gear (cables, beams,
machines, etc.) to lift your generating set. Check that
your gear is capable of lifting the set.
Lifting cables and chains must be able to move parallel
to each other.
Do not forget that any additional equipment mounted on
the generating set could alter its centre of gravity. When
lifting the set, it should remain as parallel as possible to
the ground.
I Maintenance and spare parts
Nanni Diesel engines are designed to meet the different
emission standards while delivering maximum service
life and reliability.
Regularly servicing and replacing parts with original
Nanni Diesel parts will ensure the generating set con-
tinues to function optimally.
These parts can be ordered from all Nanni Diesel deal-
ers throughout the world.
I Chemical products
The different uids used to run the generating set 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.
6
Safety precautions

7
Presentation
Thank you for choosing a Nanni Diesel generating
set!
Contact a Nanni Diesel authorised dealer for the servic-
ing of your equipment. A list of dealers can be found on
our web site:
www.nannidiesel.com
Nanni Diesel generating sets are the product of many
years of experience in the development of marine en-
gines and equipment designed for use in open seas.
Before using, ensure you have the correct manual for
your set. We will explain how to identify your equipment
and its principal specications in the chapters to follow.
If you don’t have the correct manual, please contact
your Nanni Diesel authorised dealer.
Carefully read all of this generating set instruction man-
ual and the generator documentation before starting it.
Pay particular attention to the information on personal
safety. This manual must always be to hand where the
generating set is used.
We recommend that you visually check the overall con-
dition of your generating set before and after using it
each time so that you familiarise yourself with the dif-
ferent components and can more easily detect any fuel,
oil or coolant leaks or abnormal wearing of the principal
parts.
All the information and specications in this manual are
based on the technical data applicable at the time of
its publication. Changes and updates may be made by
Nanni Diesel without notice.
Certain images, diagrams or equipment described in
this manual may not exactly represent (or be part of)
your generating set order.
Fuel supply
Ensure that the fuel contains no residues. If it does, use
special lters.
Avoid using fuel mixed with water or other substances
as you may damage the engine.
The engine performance is inuenced by the fuel tem-
perature, the temperature and relative humidity of the
exhaust air and by the altitude.
Environmental responsibility
Nanni Diesel designs its engines to have minimum en-
vironmental impact and a maximum service life. This
objective, however, can only be achieved with your full
cooperation. Our operating and maintenance instruc-
tions are to help you to protect your generating set and
adopt responsible behaviour vis-to-vis the environment.
Observe the warning and caution labels afxed to the
generating set.
Ensure you only use the fuels and oils recommended
in this manual. Using another type of fuel or oil could
cause major generator malfunctions: higher consump-
tion, reduced engine service life, greater discharge of
exhaust gases.
When draining the oil and changing the oil or fuel l-
ter, dispose of the waste in the appropriate container.
These uids cause major damage to ora and fauna if
discharged into nature.
The different uids 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 storage compartment is adequate.
Spare parts
You can order the emergency parts below from any
Nanni Diesel authorised dealer. Keep a copy of the list
of parts with the set.
These emergency parts could allow you to repair your
engine in the event of a fault.
• V-belt
• Seawater pump rotor kit
• Engine oil lter
• Fuel lter (ltering part)
• Injection tube
• Glow plug
• Air lter
• Nanni Diesel blue paint
Certain items may vary depending on your order. Con-
tact your authorised dealer for more information.

8
• The TYP inscription indicates the commercial des-
ignation of the generating set (eg. QMS10T).
• The NR inscription indicates the engine serial
number.
• The CODE inscription lists the various specica-
tions of your engine.
The elements on the alternator identication plate are
explained in the alternator documentation.
About the generator
Refer to your generator manual for more information
about this component.
The generators are installed and run for the rst time in
our factory. A professional electrician should connect
the generating set to the craft’s electrical circuit follow-
ing the applicable safety standards.
Always check the installation of your generating set be-
fore handling it. Check the overall condition of the gen-
erator, the tightness of the assembly screws and the
stability of the generator as a whole.
Identification numbers
Your generating set has 2 identication plates: one for
the engine and one for the generator.
Keep these plates accessible and in good condition.
Record and keep the engine and generator serial
number and designation. These numbers will be useful
if you work on your set, order parts or invoke the war-
ranty.
The engine identication plate is as follows:
Checks before commissioning
I Caution! : Your generating set must be installed by a
shipyard or authorised representative following the on-
board assembly instructions.
The electrical connections must also be carried out by
qualied personnel. The electrical installation must be
equipped with all the mechanisms for protecting people
and property in accordance with the applicable stand-
ards.
When the set has been installed on board and before
removing the protective elements covering the different
orices, clean the exterior surface of the generating set.
For transportation reasons, some of our generating
sets are delivered without their operating uids. In all
cases, you must:
• Check the levels and ll the engine oil if necessary.
• Fill the exchanger with coolant and degas if neces-
sary.
• If necessary prime the raw water circuit
• Check the belt tension.
• Check the tightness of the different connections
and drain caps (coolant and oil).
• Check the tightness of the alternator electrical lugs
(check the cabling by referring to the corresponding
documentation), battery terminals, circuit breaker,
connection of extension sections, battery electro-
lyte level.
• Make a nal check of the xing elements and a vis-
ual check of the generating set as a whole.
Some of these operations are explained in more detail
later in this manual.
I Caution! : The modern fuel engine is precision
equipment that requires the use of a high-quality fuel
and lubricant.
Presentation

1. Engine alternator
2. Engine alternator belt
3. Starter
4. Heat exchanger
5. Coolant ll orice
6. Coolant pump
7. Seawater pump
8. Exhaust elbow
9. Air lter
10. Oil ll orice
11. Oil lter
12. Oil drain pump (option)
13. Oil gauge
14. Fuel lter
15. Fuel pump
16. Supports
17. Generator
18. Generator identication plate
19. Engine identication plate
20. Generating set hoisting eyes
Principal parts of the generating set (QLS32T-QMS32T)
Presentation
Some equipment may not be part of your generating set.
The model represented hereafter is a QLS32T. Only the generator is different on the QMS32T.
9
18
5
20
6
2
7
1
16
16
4
3
10
20
17
8
9
14
15
11
13
19

Presentation
Principal parts of the generating set (QLS39T - QMS39T - QLS47T)
1. Engine alternator
2. Engine alternator belt
3. Starter
4. Heat exchanger
5. Coolant ll orice
6. Coolant pump
7. Seawater pump
8. Exhaust elbow
9. Air lter
10. Oil ll orice
11. Oil lter
12. Oil drain pump (option)
13. Oil gauge
14. Fuel lter
15. Fuel pump
16. Supports
17. Generator
18. Generator identication plate
19. Engine identication plate
20. Generating set hoisting eyes
21. Turbo
Certain equipment may not be part of your generating set.
The model represented hereafter is a QLS32T. Only the generator is different on the QMS32T and the QLS44T.
10
1
2
716
20
6
18
5
4
3
10
14
8
9
21
17
20
13
19
15
11

STOP
ON / STOP
START
The instrument panel allows you to start and stop the generating set, and provides you with important information
when the generating set is under operation. Check this informations regularly while operating the generating set.
Contact an authorized Nanni Diesel dealer if your generating set is equipped with instruments different than those
described in this chapter.
I Caution! : On a soundproof generating set, the local/remote selector must be in remote position to start the
generating set using the instrument panel.
I Caution! : If the coolant temperature rises or the oil pressure falls abnormally, the corresponding indicators will
illuminate and the generating set will stop automatically.
1. Heating. This indicator illuminates when the glow
plugs are heating the combustion chambers (if tted on
your generating set).
2. Coolant temperature. This indicator illuminates and
an audible alarm sounds if the coolant in the cooling
circuit overheats.
3. Battery charge. This indicator illuminates when the
set is switched on. If it lights when the generating set
is running, this indicates an engine alternator charging
fault.
4. Oil pressure. This indicator illuminates and an au-
dible alarm sounds if the oil pressure in the lubrication
circuit falls.
5. Indicator showing presence of water in fuel lter
(if tted). This indicator illuminates when there is too
much water in the fuel lter.
6. On indicator. This indicator shows that the generat-
ing set is powered (ignition).
7. Start/Stop buttons. This component starts and
stops the generating set. The ON/STOP button switch
powers up and stops the engine. The START button
starts the genset.
8. Engine oil pressure Caution! This indicator does
not show the engine oil level. This indicator shows the
oil pressure. An audible alarm sounds and the generat-
ing set stops if the oil pressure in the lubrication circuit
falls.
9. Coolant temperature. Indicates the coolant tem-
perature. An audible alarm sounds and the generating
set stops if the coolant in the cooling circuit overheats.
3
6
2
4
5
1
Instrument panel
11
Tableau Luxe GE Tableau Eco GE
8 9
7
3
6
2 4
51
7
Presentation

12
Technical specifications
* Continuous (COP) and max (PRP) power rating according to ISO 8528-1
Certain specications may vary depending on your order.
ELECTRICAL CHARACTERISTICS QMS32T QLS32T QMS39T QLS39T QLS47T
Continuous / Max power (kW)* 23.2 / 25.5 23.4 / 25.7 28.4 / 31.3 28.5 / 31.2 34.4 / 37.8
Volts / Number of phases 400 / 3
Continuous / maxi current (A) 41.9 / 46 42.2 / 46.4 51.2 / 56.5 51.4 / 56.3
Frequency (hz) 50
SPECIFICATIONS OF THE ENGINE QMS32T QLS32T QMS39T QLS39T QLS47T
Number of cylinders 4 in line
Capacity (cm3) 3318 3769
Bore/stroke (mm) 98 x 110 100 x 120
Engine speed (rpm) 1500
Weight without frame (kg) 550 556 536
INJECTION SYSTEM QMS32T QLS32T QMS39T QLS39T QLS47T
Combustion principle Indirect Direct
Intake Atmosphérique Natural Turbo
Injectors Type Bosch mini
Injection pressure (bar) 140 250
Fuel type
Gazole NF-EN 590 / Diesel Fuel N°2-D ASTM D975
LUBRICATION QMS32T QLS32T QMS39T QLS39T QLS47T
Oil pressure at max. revolutions (bar) 3.4
Type API-CF mini
Grade 15W40
Capacity in litres (at four engine) 13
COOLANT QMS32T QLS32T QMS39T QLS39T QLS47T
Capacity (litres) 12
Type 50% water + 50% mix anti-freeze and anti-corrosion additive
DISTRIBUTION QMS32T QLS32T QMS39T QLS39T QLS47T
Cold valve clearance - Intake (mm) 0.25
Cold valve clearance - Exhaust (mm) 0.25
Valve shrinkage <0.4
ELECTRICAL CIRCUIT QMS32T QLS32T QMS39T QLS39T QLS47T
Glow plug resistance (ohm) 1
Alternator 12V 60A
Battery mini capacity (Ah) 136
Starter (V-kW) 12 - 3

13
Operation of the generating set
Before starting
I Caution! : Before starting, ensure that the seacock
is open as the seawater pump rotor can be damaged if
run dry for just a few seconds. Generating sets with a
Keel Cooling system are not tted with a seawater
pump.
Never use a starting aerosol or any other equivalent
product. These products are highly ammable.
Before starting the engine and before the set is used
each time:
• Check the fuel level
• Open the fuel shutoff valve
• Open the seacock (if tted)
• Check the engine oil level and ll with the recom-
mended oil if necessary. See the “Maintenance”
section for more information.
• Check the coolant level and ll with the recom-
mended coolant if necessary. See the “Mainte-
nance” section for more information.
• Open the hold space panel(s) to fully ventilate the
hold space if it is not equipped with a fan. Otherwise
run the fan in the hold space for 5 minutes.
• Close the battery switch (ON position) and check
that the emergency stop is not activated.
I Caution! : Ensure you have replaced the protection
elements before starting the generating set.
Notice: If your engine has not been used for several
months of if the fuel circuit has been drained, use the
priming pump situated above the fuel lter. This lls the
fuel circuit if it has drained out or after a circuit compo-
nent has been replaced.
Starting the generating set
I Caution! : On a soundproof generating set, the lo-
cal/remote selector must be in remote position to start
the generating set using the instrument panel.
Carry out the following operations to start your generat-
ing set in complete safety:
1. Press the ON/STOP button. All of the indicators
illuminate and an audible signal sounds. This stage
allows you to check that these elements are working
properly. After a few moments, only the oil and battery
charge indicators will remain lit.
2. Hold the START button at midcourse to begin
preheating. The PREHEAT warning light illuminates.
Hold the button for 5 to 20 seconds according to the
temperature on the outside. Push fully the button to
start the generating set.
I Caution! : If the generating set does not start on
the rst attempt, repeat the manoeuvre, waiting 5 to 15
seconds between each attempt, with the set switched
off. Never force it as there is a risk of water backow
into the engine via the exhaust system.
Check the indicators on the instrument panel after start-
ing and when operating the set.
Check also that the seawater is running through the ex-
haust and check there are no fuel or water leaks.
I Caution! : If the coolant temperature rises or the oil
pressure falls abnormally, the corresponding indicators
will illuminate and the generating set will stop auto-
matically.
Identify and eliminate the cause before restarting the
engine. See the “Fault-nding” section for more infor-
mation.

14
Operation of the generating set
During operation
Regularly check the indicators on the generating set in-
strument panel.
Notice: If the generating set runs continuously, the oil
level should be checked every 8 hours.
Never press the START button when the generating set
is under operation.
Alarm indicators
If the oil pressure is too low in the engine lubrication cir-
cuit, the “engine oil pressure” indicator illuminates and
an audible alarm sounds and the generating set stops.
If the coolant temperature is too high, the “coolant tem-
perature” indicator illuminates and an audible alarm
sounds and the generating set stops.
I Warning! : Never open the coolant and oil circuit
caps when the engine is running and/or hot.
If the voltage supplied by the engine alternator drops,
the “Battery charge” indicator illuminates.
See the “Fault-nding” section for the basic checks to
make in the event of a fault.
In all cases, if one or more of these problems persist,
stop your generating set except in emergencies and
contact your Nanni Diesel authorised dealer.
Stopping the generating set
Before stopping the generating set, cut the power
of the electrical appliances connected to the craft’s
on-board electrical circuit.
Depress the ON/STOP button and then release.
Emergency stop
You can stop the engine manually if the standard shut-
down procedure is not working or in an emergency. Use
the emergency stop button situated on the electrical
junction box or cut the fuel supply.
I Warning! : Working on a running motor is extremely
dangerous.
After the engine has stopped
Open the circuit breaker (battery supply closed), close
the seacock (if tted) and the fuel shutoff valve. Check
the condition of the compartment in order to identify any
leaks.
I Warning! : Even after your generating set has
stopped, elements remain hot and pressurised for sev-
eral minutes. As far as possible, limit work on the gen-
erating set immediately after stopping it.
I Caution! : If your generating set is connected to
a seawater intake, if the craft is being towed, stop the
generating set and always close the seacock to prevent
the generating set from accidentally lling with seawa-
ter.

15
The regular maintenance of your generating set is
essential for ensuring optimal reliability and service life.
The following operations and the those described in the
Silverwake warranty booklet will enable you to extend
the service life of your engine and reduce its impact on
the environment.
During the warranty period, it is essential that all work
is carried out by a Nanni Diesel authorised dealer.
However, some regular checks, particularly those made
each time the engine is used, can only be made by the
user.
Some operations are explained to you further on so that
you can work on the engine in an emergency or if there
is no repair centre nearby. However, we recommend you
have your work checked by a Nanni Diesel authorised
dealer.
I Caution! : As far as possible, limit work on the engine
when it is under operation and/or when you are sailing.
These instructions only describe a part of the
maintenance operations to be carried out. Find the
complete list on the Silverwake warranty booklet. The
operations listed on the Silverwake must be carried out
by an authorised Nanni Diesel technician.
The instrument panel shows you how long your engine
has run since its commissioning.
Notice: Some equipments are optional and may not be
part of your generating set.
In order to preserve the mechanical qualities of the
engine and prolong its service life, we recommend you
follow the instructions below:
Use a coolant made of 50% water and 50% of pure
antifreeze. Use clean and distilled water for the mix:
Water that is too hard will produce limescale build-up
and will reduce the cooling system’s effectiveness.
The cooling system allow the engine to operate at a
optimal temperature. The cooling system must be filled
with a coolant that protects the engine against internal
corrosion and from freezing, if the climate requires it.
A faulty operation of the cooling system reduces its
efficiency and therefore the engine’s service life.
Use antifreeze depending on climatic conditions: it will
protect against freezing to a temperature of less than
-25°C. If the engine must be switched off for a long
period in an environment with a high risk of frost, the
coolant must be drained.
Do not engage the starter motor for more than 10
seconds: The continuous use of the starter for more
than 10 seconds will damage the system.
Choose a diesel fuel meeting standard DIN-EN
590. If using Biodiesel (according to UNI EN14214
specifications) this can be blended up to 5% with
a fuel available in Europe (according to the DIN EN
590 standard: a lower quality fuel will result in poor
combustion, which may cause starting problems and
heavy smoke emissions.
Draining the fuel tank: Remove the deposits in the fuel
regularly. The rst time after 50 hours of operation and
then every 300 hours.
Use a good-quality lubricant: Poor-quality lubricating
oil will damage the engine in terms of the wear of the
parts, jamming, etc., or rather reduce its service life.
Use an API-CF mini type oil adapted to the climatic
conditions and temperature (Contact your local dealer
for further informations).
Maintenance

16
Regularly check the condition of the generating set and
its compartment before and after it is used: check for
the presence or not of fuel or oil leaks, the tightness of
the different clamps and bolts, the condition of the belts,
hoses and the various electrical cables, the wear of the
zinc anode (if tted), the battery electrolyte level.
These relatively simple checks can help you to detect
possible faults before major work on your set is required.
I Caution! : Do not let oil, fuel or grease deposits build
up around the generating set as they may increase the
risk of re in the engine compartment.
Check the operation of the different lamps and indica-
tors situated on the instrument panel. Take care not to
get the generator wet when cleaning the engine.
Maintenance
I Attention! Carry out these operations when the
generating set is stopped and cold.
The air lter essentially reduces the level of noise
made by the engine and puries the air injected into
the combustion chamber.
If the lter is too clogged, replace it. If it is not:
• Remove the hose retaining ring and remove the
lter.
• First clean the lter with compressed air
• Let it dry completely at ambient temperature and
then put it back in its place.
Daily checks Air lter

B
A
C
17
Fuel system
I Warning! : Total cleanliness must be guaranteed
when working on the fuel circuit. No impurities must en-
ter the injection pump and the injectors. Carry out each
of these operations with the engine cold and stopped.
Bleeding the fuel circuit
The fuel circuit is self-priming but manual bleeding is re-
quired after replacing the lter, after have running out of
fuel or after a work on the circuit if it has been emptied.
• Loose the drain valve screw A on the engine fuel
lter support.
• Pump the priming pump by pressing the button B
repeatedly until bubble-free fuel comes out of the
drain valve screw.
• Tighten the drain valve screw and lock the hand
pump.
I Caution! : Avoid draining all the fuel in the lter when
venting. If so, remove the lter and replenish with fuel
before replacing it and repeat the venting operations.
Maintenance
Replacing the fuel filter
This lter treats the water and impurities in the fuel be-
fore it enters the injection circuit.
• Cut the fuel intake at the tank.
• Place a receptacle under the lter and then remove
the used lter C cartridge.
• Apply a thin layer of fuel over the seal surface of
the new lter cartridge before tting it.
• Tighten it by hand until the lter makes contact with
the lter head then tighten it by a half-turn.
• Untighten the drain valve screw to release the air.
Open the fuel valve again and drain the circuit.
• Start the engine and check the assembly is leak-
tight.
I Caution! : Used lters must be disposed of in an ap-
propriate container.
Replacing the fuel prefilter
The fuel prelter is an optional component that puries
the fuel before it is injected in the engine. These instruc-
tions are given as an example only.
• Close the fuel shutoff valve on the fuel tank.
• Place a receptacle under the fuel prelter. Remove
the lter tank
• Drain and clean the lter tank.
• Replace the cartridge and re-install the tank.
• Open the fuel valve. Drain the feed system then
start the engine to check the leak-tightness.
Draining the water from the fuel prefilter
Before starting the engine each time, ensure there is
no water in the fuel prelter. If there is water, place a
tray under the fuel prelter and then drain the water and
impurities using the bottom cap/valve.

18
Lubrication system
Checking the oil level
I Caution! : Carry out these operations with the engine
stopped. Hot oil and hot surfaces can burn.
If oil of a different brand or viscosity to the previous is
used, drain the old oil. Never mix two different types of
oil. Observe the recommended draining intervals.
The oil level should be within the range indicated on the
oil gauge. To check the oil level:
• Start the engine and let it run at idle for several
minutes.
• Stop the engine and remove the starter key.
• Remove and wipe down the gauge rod.
• Re-insert it and then remove it.
• Check whether the oil level is between the two
notches. If the level is too low, add more oil until
reaching the specied level.
Top up oil slowly via the ller port located on the top of
the engine. Add the oil slowly and wait several minutes
before checking the level again. This allows the oil to
run into the engine crankcase.
I Caution! : Do not ll the crankcase above the
maximum level indicated on the gauge.
Draining the engine oil
I Warning! : Carry out these operations with the
engine stopped. Hot oil and hot surfaces can burn.
• Start the engine and let it warm up for approximately
5 minutes so that oil suction is easier. Stop the
engine.
• Use a pail to collect the extracted oil and pump until
the oil has been completely extracted. Rell with
the new oil (the amount of oil to add is indicated in
the technical specications section).
• Check the level with the gauge, ensuring you do
not go above the maximum level.
• Start the engine and check that the oil pressure
indicator is extinguished and that there are no leaks
in the lubrication circuit. Let the engine warm up for
several minutes and then check the oil level again.
Fill again if necessary.
Replacing the oil filter cartridge
I Caution! : Carry out these operations with the en-
gine stopped. Hot oil and hot surfaces can burn.
• Remove the oil lter cartridge with a lter key.
• Clean the lter support in order to prevent impuri-
ties from entering the engine.
• Apply a ne layer of oil over the rubber seal of the
new cartridge.
• To install the new cartridge, tighten it by hand until it
makes contact with the lter head and then tighten
by a half-turn. Over-tightening may lead to the de-
formation of the seal.
• After replacing the lter, check that the engine oil is
not leaking through the seal and check the oil level
using the gauge. Add oil if necessary.
Maintenance

19
Cooling system - Coolant
Maintenance
The cooling system enables the engine to operate at an
optimal temperature.
In the case of a cooling by closed heat exchanger, the
coolant is cooled by sea water passing through the ex-
changer. Then it cooled several components of the en-
gine.
In a Keel Cooling system, engine heat is dissipated by
passing coolant through tubes incorporated to the hull.
Contact the installer of the genset for more informations.
The cooling system must be lled with a coolant com-
prising 50% water and 50% anti-freeze and anti-corro-
sion additive.
The coolant must be changed regularly as the additives
become less effective over time. Prepare the mix be-
fore lling the exchanger. If the generating set must be
switched off for a long period in an environment with a
high risk of frost, the coolant must be drained.
I Attention! : Never use just water to ll the cooling
circuit. Always use a clean receptacle and ensure the
uids are well mixed.
Draining and rinsing the cooling circuit
The coolant in the cooling circuit must be drained in or-
der to remove the various deposits that can build up in
the circuit.
Carry out this operation with the engine stopped and
cold.
• Place a receptacle under the drain cap then un-
tighten it.
• Let the coolant run out until the exchanger is empty.
• Open the coolant ll cap and clean the inside of the
heat exchanger with clean water and a hose.
• Continue until clean water runs from the drain ori-
ce.
• Once the water has been totally removed from the
exchanger, close the unit drain cap again then rell
with coolant.
Coolant lling
I Attention! : Do not check the coolant level when
the engine is hot. Pressurised coolant can spurt and
cause serious burns. Carry out this work with the
engine stopped and cold. Only use new coolant when
replenishing or adding coolant.
The coolant level must be between the min and max
level indicated in the exchanger.
• Turn the ll cap A situated on the heat exchanger
to its rst stop to release the system pressure and
then remove the cap.
• Fill the heat exchanger slowly with coolant up to the
maximum level in order to let the air escape.
• Run the engine for several minutes and keep it
idling. Stop the engine, wait a few moments, then
check the coolant level again. Fill again if neces-
sary.
A

20
Cooling system - Seawater
I Caution! : When the craft is in the water, there is a
risk of water penetrating the craft when working on the
seawater circuit. Water can penetrate the craft via com-
ponents located below the waterline. Close the seacock
(if tted) or prevent water discharge before working on
the seawater system !
Cleaning the seawater system is essential to prevent
the formation of deposits and salt crystals.
Your generating set may not be tted with a seawater
cooling system (such as in the case of a Keel Cooling
system).
Cleaning the seawater filter
The seawater lter is an optional component. These in-
structions are given as an example only.
• Check the condition of the seawater lter with the
engine stopped. If deposits have formed, remove
the lter in order to clean it.
• Remove the cover and then the ltering part A. Re-
move all the debris on the housing.
• Rinse the lter and the housing with fresh water
and check the condition of the seal, then re-install
all the components and check there are no water
and/or air leaks in the circuit when operational.
Draining and rinsing the seawater circuit
• Close the seacock.
• Disconnect the hose running from the seacock.
• Place the hose in a receptacle lled with fresh wa-
ter. Ensure the receptacle you use is large enough
as the seawater pump must never be run without
water.
• Check that no one is in the vicinity of the engine
and then start it. Let the engine run for several min-
utes, checking that the receptacle is at all times
lled with fresh water.
• Once the circuit is fully rinsed, re-connect the hose
correctly to the seawater lter.
• Drain also the exhaust circuit. A small amount of
water may remain in the bottom of the waterlock
box.
• Run the engine for few minutes in order to check
for leakage.
Replacing the seawater pump rotor
The seawater pump rotor is an essential component. It
must be replaced regularly along with the seal. A worn
rotor could crack and damage the cooling system. Al-
ways have a replacement rotor on board the craft.
• Close the seacock.
• Remove the seawater pump cap A and the seal B,
then remove the rotor C without damaging it.
• Check the condition of the rotor: replace it if even
the most minor defect is noted. If the rotor is dam-
aged, drain the seawater system and check that
the heat exchanger is not clogged by pieces of rub-
ber. Clean it if necessary.
• Clean the elements.
• Fit a new rotor by turning it clockwise.
• Lubricate the pump casing and the inside of the lid
with waterproof grease for rubber.
• Ret the water pump cap using a new seal.
• Open the seacock and then start the engine to
check that the circuit is leak-tight.
B
A
C
Maintenance