Whisper Power m-sq25, m-sq20 User Manual

USERS MANUAL

M-SQ20 / 25

- 1500 RPM -

Marine diesel generating set 230/400V / 50Hz

Digital Diesel Control

WHISPER POWER BV
Kelvinlaan 82
9207 JB Drachten
Netherlands
Tel.: [phone]
Fax.: [phone]
www.whisperpower.eu

V1. November 2010

Art.nr. . 40200441

CONTENTS

2 November 2010 / M-SQ20 / 25 / EN

CONTENTS:

1 INTRODUCTION .............................................................................................................................................................. 4

1.1 General .............................................................................................................................................................. 4

1.2 Service and maintenance ................................................................................................................................... 4

1.3 Guarantee .......................................................................................................................................................... 4

1.4 Liability ............................................................................................................................................................... 5

1.5 Identification ....................................................................................................................................................... 5

1.5.1 General .............................................................................................................................................. 5

1.5.2 Identification plate ............................................................................................................................. 5

2 INFORMATION ................................................................................................................................................................ 7

2.1 Safety ................................................................................................................................................................. 7

2.1.1 General .............................................................................................................................................. 7

2.1.2 Electrical safety ................................................................................................................................. 7

2.1.3 Earth insulation failures ..................................................................................................................... 7

2.1.4 Installation ......................................................................................................................................... 7

2.1.5 Operation ........................................................................................................................................... 8

2.1.6 Fire and explosion ............................................................................................................................. 8

2.1.7 Chemicals .......................................................................................................................................... 8

2.2 Transport, lifting and storage .............................................................................................................................. 9

2.3 The M-SQ20 / 25 ................................................................................................................................................ 9

2.3.1 Features ............................................................................................................................................ 9

2.3.2 Remote control .................................................................................................................................. 9

2.3.3 Documentation .................................................................................................................................. 9

2.3.4 Accessories included in the standard delivery ................................................................................... 9

2.4 Components ..................................................................................................................................................... 10

2.4.1 Main components ............................................................................................................................ 10

2.4.2 Generator control panel ................................................................................................................... 12

2.4.3 Remote control panel ...................................................................................................................... 12

2.5 Technical Information ....................................................................................................................................... 12

2.5.1 AC alternator ................................................................................................................................... 12

2.5.2 Engine ............................................................................................................................................. 13

2.5.3 Digital Diesel Control system ........................................................................................................... 13

2.5.4 Battery charger ................................................................................................................................ 13

2.5.5 Alarms and shut down ..................................................................................................................... 13

2.5.6 Monitoring ........................................................................................................................................ 13

2.5.7 Control ............................................................................................................................................. 14

2.5.8 Remote control ................................................................................................................................ 14

2.5.9 Hour counter .................................................................................................................................... 14

2.5.10 Load indicator .................................................................................................................................. 14

2.5.11 Fuel specification ............................................................................................................................. 14

2.5.12 Oil information ................................................................................................................................. 14

2.5.13 Cooling liquid ................................................................................................................................... 14

2.5.14 Technical data ................................................................................................................................. 15

2.5.15 Electrical diagram control wiring M-SQ20 / 25 ................................................................................. 16

2.5.16 Terminal modes 115V 400C 50Hz................................................................................................... 17

2.5.17 Generator Diagram 3 phase with AVR 230V – 400V 50Hz with AVR .............................................. 18

2.5.18 AC Wiring Diagram single phase with AVR 230V Hz (Double Delta) .............................................. 19

CONTENTS

EN / M-SQ20 / 25 / November 2010 3

3

OPERATION .................................................................................................................................................................. 20

3.1 General ............................................................................................................................................................ 20

3.2 Operating Instructions ...................................................................................................................................... 20

3.2.1 Summarised operating instructions (daily use) ................................................................................ 20

3.2.2 Extended operating instructions ...................................................................................................... 20

4 MAINTENANCE ............................................................................................................................................................. 23

4.1 Alternator .......................................................................................................................................................... 23

4.2 Engine .............................................................................................................................................................. 23

4.2.1 Preliminary instructions ................................................................................................................... 23

4.2.2 Bleeding fuel lines ........................................................................................................................... 23

4.2.3 Valve clearance ............................................................................................................................... 23

4.2.4 Replacing fuel filter .......................................................................................................................... 23

4.2.5 Replacing oil filter ............................................................................................................................ 24

4.2.6 Tensioning V-belt............................................................................................................................. 24

4.3 Regular maintenance ....................................................................................................................................... 25

4.3.1 Maintenance schedule ..................................................................................................................... 26

4.3.2 Taking out of service ....................................................................................................................... 26

5 TROUBLE SHOOTING .................................................................................................................................................. 27

5.1 Alternator/ electrical faults ................................................................................................................................ 27

5.1.1 General ............................................................................................................................................ 27

5.1.2 Trouble shooting table ..................................................................................................................... 27

5.2 Engine faults ..................................................................................................................................................... 28

5.2.1 General ............................................................................................................................................ 28

5.2.2 Trouble shooting table ..................................................................................................................... 29

5.2.3 Warnings ......................................................................................................................................... 32

5.2.4 Service address ............................................................................................................................... 32

5.3 Special procedures alternator ........................................................................................................................... 32

5.3.1 Automatic Voltage Regulator (AVR) ................................................................................................ 32

5.3.2 Residual voltage check / excitation procedure (flashing) ................................................................. 33

5.3.3 Testing rotary rectifier diodes .......................................................................................................... 33

5.3.4 Winding resistant values .................................................................................................................. 33

5.3.5 Meggering ....................................................................................................................................... 34

5.4 Special procedures engine ............................................................................................................................... 34

5.4.1 Setting the RPM .............................................................................................................................. 34

5.4.2 Adjusting valve clearance and retightening the cylinder head bolts. ............................................... 35

5.4.3 Measuring exhaust backpressure .................................................................................................... 35

5.4.4 Disassembling instructions .............................................................................................................. 36

6 SPARE PARTS .............................................................................................................................................................. 38

MAINTENANCE LOG ............................................................................................................................................................... 41

INTRODUCTION

4 November 2010 / M-SQ20 / 25 / EN

1 INTRODUCTION

1.1 General

This manual applies to the WhisperPower M-SQ20 / 25
generating set controlled by Digital Diesel Control first
launched in September 2005. For other models see other
manuals available on our website: www.whisperpower.eu.

The M-SQ20 / 25 Marine Diesel Generating set is
manufactured and marketed by WhisperPower.
It is important to read this manual before installing and
operating the generating set. Both safety and durability
rely very much on the correct identification, installation and
a good understanding of ratings, features, design,
maintenance and operation procedures.
The information, specifications, illustrations and
statements contained within this publication are given with
our best intentions and are believed to be correct at the
time of going to press.
Our policy is one of continued development and we re­serve the right to amend any technical information without
prior notice.
Whilst every effort is made to ensure the accuracy of the
particulars contained within this publication neither the
manufacturer, distributor, or dealer in any circumstances
shall be held liable for any inaccuracy or the
consequences thereof.

WARNING

A warning symbol draws attention to special
warnings, instructions or procedures which, if
not strictly observed, may result in damage or
destruction of equipment, severe personal
injury or loss of life.

DANGER

This danger symbol refers to electric danger
and draws attention to special warnings,
instructions or procedures which, if not strictly
observed, may result in electrical shock which
will result in severe personal injury or loss of
life.

1.2 Service and maintenance

Regular service and maintenance should be carried out
according to the directions in this manual. For service and
maintenance one can appeal to the manufacturer or the
dealers.

1.3 Guarantee

WhisperPower guarantees that this generating set has
been built according to good workmanship, according to
the specifications in this manual and according to
European Community safety regulations.
During production and prior to delivery, all of our
generating sets are tested and inspected.

The well functioning of this generating set is subject to
guarantee. The period and conditions of this guarantee are
laid down in the general conditions of delivery as
registered with the Chamber of Commerce and Industries
for the North of the Netherlands number 01120025. The
guarantee period is two years, limited to 1000 running
hours. Some aspects of our guarantee scheme are given
here in more detail:
Guarantee does not cover failures that are caused by
misuse, neglect or a faulty installation.

Example 1. Faulty installation:

Seawater entering the engine is the most common cause
of damage to combustion engines in boats. (Both to
propulsion and generator engines.) The entry of water
must be avoided under all conditions. Be aware that the
conditions in blue water sailing can be extreme. See the
installation manual for instructions but remember these are
for guidance only as many factors influence the installation
of a generator. The ultimate responsibility will always be
with the owner to ensure a safe and compliant installation.

WARNING
Damage caused by the ingress of water is
never covered by guarantee.

Example 2: Misuse:

Long term running with no load or too little load can cause
the exhaust to get choked with soot or carbon. Cleaning
the exhaust is not covered by guarantee.

Example 3: Neglect

Sometimes the seal of the raw water pump starts leaking.
Mostly this begins with a little drip and slowly gets worse.
Regular visual inspection of the generator is necessary to
prevent damage to occur from a leaking water pump.
When one find serious damage after weeks of neglect
guarantee claims will not be honoured.

INTRODUCTION

EN / M-SQ20 / 25 / November 2010 5

Example 4: Neglect

Whisper generators have an option for an auto start/stop
mode or interval mode.
WhisperPower cannot be held responsible for damage
caused by the unattended running generator.

Guarantee means that faulty parts are repaired or
replaced free of charge. If necessary the whole generator
unit will be exchanged. Labour necessary to complete
repairs on board a vessel executed by an authorized
service engineer is covered, but is limited to a reasonable
number of hours and reasonable rates in relation to the
actual repair work that has to be done.
Travel expenses and travel hours are not covered. Also
not covered is the labour required to take a generator out
of a boat or for reinstallation. There is no cover for labour
needed to get access to the generator, for example to
remove equipment or bulkheads etc.

Goods to be delivered under guarantee will be invoiced.
Only after the faulty goods are returned will the invoice be
credited. Payment in advance may be required or
guaranteed by credit card. If after the faulty goods are
returned, it is indicated that the failure was not covered by
guarantee a credit will not be issued. For example if a
Printed Circuit Board is returned with clear damage
caused by seawater, guarantee will be refused.
Freight costs to deliver spares by normal mail or carriers is
covered under guarantee. Special services like express
mail, overnight delivery etc. are not covered. Taxes and
duties are not covered. For shipments to remote off shore
areas any additional costs incurred over normal carriage
will be invoiced to the customer.
The cost for returning faulty goods is not covered under
guarantee.

1.4 Liability

WhisperPower does not accept responsibility for damage,
injuries or casualties which are the result of operation of
the generating set in specific conditions which brings
dangers which could not be foreseen, or could be avoided
by additional measures. WhisperPower does not accept
liability for damage due to use of the generator, possible
errors in the manuals and the results thereof.

Automatic start/stop
WhisperPower cannot be held responsible for damage
caused by the unattended running generator using the
auto-start/stop mode or interval mode.

1.5 Identification

1.5.1 General

Before using this generating set it is very important to
identify the set correctly. To communicate for service or
ordering parts it is also essential to correctly identify the
generating set. Also for the daily operation of the genera­ting set it is necessary that the operator knows the correct
specifications.

1.5.2 Identification plate

All required identification data are on the identification
plate.

Fig. 1: Identification plate.

1 The identity of the generating set is given by the

SERIAL NUMBER.
When this number is available the manufacturer can
trace the specifications of the generating set. On the
nameplate are also some basic features of the set:

INTRODUCTION

6 November 2010 / M-SQ20 / 25 / EN

Fig. 2: Location identification plate.

2 POWER

The nameplate gives the nominal maximum continues
load in kVA = kW calculated with power factor one.
When calculating a load one should always take into
account the power factor or cos phi of this load. The
power should never exceed the nominal power as
shown on the nameplate. Power is rated at an
ambient temperature of 40°C and a seawater
temperature of 25ºC. For higher temperatures the
generating set has to be de-rated.

3 VOLTAGE. This shows the nominal voltage.

This voltage should be within the specified tolerance
at the nominal frequency. The M-SQ20 / 25 can be
connected for different voltages in single phase or tri
phase. The nameplate indicates the connection as
made in the factory; BE AWARE THAT THE
CONNECTIONS COULD BE RECONNECTED BY
FORMER USERS

4 FREQUENCY. This is shown in Hz and is determined

by the speed of the engine (RPM). 50 Hz correlates
with 1500 rpm.

5 CURRENT. This shows the maximum current that is

acceptable at the specified frequency, voltage and
power factor. When connected in tri phase the
indicated current is the current between two phases
that can be taken off three times.

6 WEIGHT shows the net dry weight (approximately) in

kg. This is without fuel, oil, packing and external
installation equipment

7 CE MARKING.. The CE symbol shows that the

generating set is build according to European
Community safety regulations. This includes the
regulations regarding the safety of pleasure craft,
safety of machinery, regarding electric safety and
electric magnetic compatibility (EMC).

Safety also relies on the installation, application and
circumstances. See also the remarks in this manual under
SAFETY.

Before changing a factory setting you are advised to
consult the manufacturer. When the generating set you
have to identify is not new you have to take into account
the possibility that former users did change the settings.
Check the settings (voltage, frequency, rpm) when there is
any doubt.

INFORMATION

EN / M-SQ20 / 25 / November 2010 7

2 INFORMATION

2.1 Safety

2.1.1 General

When correctly installed and used in normal
circumstances this generating set fulfils EC safety
regulations. This generating set could be part of an
installation or could be used in a way that additional
regulations of the EC or other authorities have to be taken
into account.

DANGER
Warning signs draw attention to special
warnings, instructions or procedures which, if
not strictly observed, may result in electrical
shock which will result in severe personal
injury or loss of life.

Circumstances could make it also necessary to take
additional measures. Be aware of wet conditions and
hazardous environments caused by explosive gases etc

2.1.2 Electrical safety

This warning sign indicates parts which could
be live. The voltage of 230V or 230V/400V
generated by this generating set is dangerous
and if instructions and procedures are not
strictly observed may result in electrical shock
which will result in severe personal injury or
loss of life.

• Check all wiring at least once a year. Defects,
such as loose connections, burned cables etc.
must be repaired immediately.

• Do not work on the electrical system if it is still
connected to a current source. Only allow
changes in your electrical system to be carried
out by qualified electricians.

• Using the auto-start/stop (interval) mode the
generator can start unexpectedly. When working
on the electrical system, the 3 Amp fuse must be
removed from the control panel and the battery
plus cable must be removed from the battery.

• Connection and protection must be done in
accordance with local standards.

2.1.3 Earth insulation failures

According to local regulations and depending on the
application it could be necessary to take measures for
protection against earth insulation failures.
In the standard delivery “neutral” and “ground” are not
connected. To make a connection between “neutral” and
“ground” could be necessary as part of a specific
insulation failure protection system.
Small pleasure craft in Europe is submitted to The
Recreational Craft Directive 94/25/EC. The guidelines of
this directive refer to (ISO 13297).

When the installation complies with this standard the
“neutral” and “ground” should be connected on the
generating set.

Be aware that insulation protection systems can be
different for different applications and even within the ship
there could be different standards for different spaces. We
did refer to the Recreational Craft Directive that applies to
pleasure craft up to 24 m of length. Sometimes one has to
comply with other standards such as the rules of
certification societies like Lloyds Register of Shipping or
Veritas, regulations for the protection of personal, building
legislation, etc. It is of the greatest importance to have
expert advice on this issue.

In all situations the transfer switches between
shore, inverter and generator should switch
both neutral (N) and all phase lines (L1, L2
and L3).

2.1.4 Installation

Whisper generating sets are not self contained and have
to be properly installed in enclosed areas such as a
machine room.

Installation includes measures to be taken to
outlet exhaust fumes which contain carbon

monoxide and are extremely dangerous.
Carbon monoxide (CO) is an invisible odourless gas.
Inhalation produces headache, nausea or death.
Installation includes measures for proper ventilation, safe
electric connections, safe installation of the starting
battery, proper fitting of the cooling system and fuel pipes
etc. See the installation manual.

INFORMATION

8 November 2010 / M-SQ20 / 25 / EN

2.1.5 Operation

External moving parts like fans and V-belts are covered by
the canopy and therefore the M-SQ20 / 25 is very safe
when the canopy is closed.

Nevertheless take note of the signs on the
generating set which show symbols in a
triangle indicating danger.

When service has to be carried out while the
engine is running, be aware of moving parts
like V-belts.

• The generating set should be operated by
authorised personnel only.

• Be aware of hot parts and especially parts of the
exhaust system and cooling system.

• If the generating set is unsafe, fit danger notices
and disconnect the battery positive (+) lead so
that it cannot be started until the condition is
corrected.

• Do not attempt to operate the generating set with
a known unsafe condition. Disconnect the battery
positive (+) lead prior to attempting any repairs or
cleaning inside the enclosure.

• Always consult the manual before carrying out
maintenance.

• Do not change the settings without consulting the
manufacturer. Keep a record of setting changes
in this manual.

2.1.6 Fire and explosion

Fuels can be flammable. Proper handling
limits the risk of fire and explosion.

• Avoid refilling the fuel tank while the engine is
running. When oil or fuel is leaking do not use the
generating set.

• Do not run the engine close to explosives or
gasses.

• Hydrogen gas generated by charging batteries is
explosive. Take measures for proper ventilation.
Do not smoke or allow sparks, flames, or other
sources of ignition around batteries.

• Keep a fire extinguisher on hand.

IN CASE OF FIR E, D O NOT OPEN SOU NDSHIELD.
TO AVOID SERIOUS INJURY OR DEATH FROM FIRE

IMMEDIATELY DI SCHARGE ENTI RE CONTENTS OF GASEOUS

SHUT DOWN ENGINES, GE NERATO R SETS AND BLOWERS.

PORTABLE FIRE EXTINGUISHER THROUGH THIS POR T.

THROUGH

HERE

FIRE EXTINGUISHER PO R T :

BREAK

Fig. 3 Fire extinguisher port.

• In case of fire do not open the soundshield. To
avoid serious injury or death from fire, shut down
engines, generator sets and blowers. Break
through the label which is indicated by BREAK
THROUGH HERE and then immediately
discharge entire contents of gaseous portable fire
extinguisher through the fire extinguisher port. On
the generating set this fire extinguisher port is
indicated by the label as shown in figure 3.

• Poor electrical connections or using wiring which
is not suited for the rated currents can cause
overheating and possibly fire.

2.1.7 Chemicals

• Fuels, oils, coolants, and battery electrolyte can
be hazardous to personnel if not treated properly.
Do not swallow or have skin contact with these
liquids. Do not wear clothing that has been
contaminated by fuel or lubricating oil.

• Gaskets may be manufactured from asbestos.
Particles of this material should not be inhaled as
this may result in fatal diseases.

• On no account allow any unprotected skin to
come into contact with the injector spray as the
fuel may enter the blood stream with fatal results.

• Engines may be fitted with seals or O-rings
manufactured from "viton" or similar material.
When exposed to abnormal high temperatures in
excess of 400°C an extremely corrosive acid is

INFORMATION

EN / M-SQ20 / 25 / November 2010 9

produced which cannot be removed from the
skin. If signs of decomposition are evident, or if in
doubt, always wear disposable heavy duty
gloves.

2.2 Transport, lifting and storage

When lifting the generating set avoid any risk
of personal injuries, do not stand under the
generating set.

• Use soft slings to avoid damage

• On the engine are lifting eyes, which can be used

to take the generator out of the capsule. The
lifting eyes can also be used to lift the entire
generator set, including the capsule

• After transporting the generating set check for
damage before installation.

• Long term storage can have detrimental effects
on engine and alternator. The engine should be
put through an engine preservation procedure.
(See the maintenance chapter)

• The alternator windings tend to condense. To
minimise condensation, store the generating set
in a dry and warm storage area.

• After removing the generating set from long term
storage perform an insulation check. (See the
alternator maintenance paragraph for
procedures)

• While the battery is stored it should be recharged
every 12 weeks.

2.3 The M-SQ20 / 25

2.3.1 Features

This generating set includes a 4 cylinder diesel engine
which is connected by close coupling to a tri phase
synchronous alternator in a sound attenuated capsule.
The set is mounted on a steel base frame and mounted
securely on anti vibration mounting pads to the capsule
base. The complete set is again on rubber mountings. All
cables and hoses are guided through the capsule’s sides.
The set is not self contained and is only operable after
proper installation using additional accessories and
installation materials.
Installation accessories are listed in the installation manual
and are available through the supplier of the generating
set. The full automatic Digital Control is based on
microprocessor technology. Several automatic start/stop
functions can be programmed and monitored (see Digital
Diesel Control user manual).

2.3.2 Remote control

The full automatic remote control panel including 15 mtr
cable comes as standard with the M-SQ20 / 25.

2.3.3 Documentation

Included in the delivery is this user manual (number:

40200441), an installation manual (number: 40200451), a
user manual for DCC (number: 40200461) and a quick
reference guide for the DDC (40200275).
Not included in the standard delivery but available as
options are:

• Parts manual; number: 40200187

• Workshop manual; number: 40200174

However in this manual there is a list of important parts for
maintenance and spare parts as well as a chapter on
maintenance and problem solving.

All manuals are available on our web site
www.whisperpower.eu.

2.3.4 Accessories included in the standard
delivery

• Expansion tank, hose and fittings

• Template to mount the generator

INFORMATION

10 November 2010 / M-SQ20 / 25 / EN

2.4 Components

2.4.1 Main components

Fig. 4: Left View main components M-SQ20 / 25

Fig. 5 Top View main components M-SQ20 / 25

01 Thermostat housing
02 Boiler connection
03 Engine coolant pump
04 V-belt
05 Exhaust connection
06 Bypass cooling water out
07 Bypass cooling water in
08 Battery +
09 Battery ­10 Fuel out
11 Fuel in
12 Raw water inlet
13 Raw water pump
14 Rubber engine mounting

15 Filler cap engine oil
16 Filler cap engine coolant
17 Rubber engine mounting
18 Rocker cover

INFORMATION

EN / M-SQ20 / 25 / November 2010 11

Fig. 6 Front View main components M-SQ20 / 25.

Fig. 7: Rear View main components M-SQ20 / 25.

19 Hoist eye rear
20 Engine speed adjusting

screw
21 Fuel injector
22 Glowplug (4x)
23 Fuel filter
24 Fuses
25 Control panel
26 Air cleaner element
27 Indentification plate
28 Oil swump handpump
29 Coolant drain plug
30 Engine oil dipstick
31 Fuel solenoid
32 Oil filter
33 Injection pump air bleeding

screw
34 Fuel lift pump for manual

primimg
35 Fuel injection pump
36 Heat exchanger

37 Temperature switch
38 Hoist eye front
39 Alternator
40 Exhaust manifold

(watercooled)
41 Hoist eye alternator
42 Digital Diesel Control (DDC)
43 Expansion tank
44 Power take off hydro pump
45 Remote control
46 AC power output
47 Temperature switch exhaust
48 Cooling water injection bend
49 Engine oil pressure switch
50 Starter motor solenoid
51 Starter motor
52 Engine serial number (above

starter motor solenoid)
53 Automatic voltage regulator

(AVR)

INFORMATION

12 November 2010 / M-SQ20 / 25 / EN

2.4.2 Generator control panel

Start / Stop

Remove fuse

Internal fuel pump
Fuse 3A

befo re maintenance

Digital Di esel Control
Fuse 3A

A uxiliary
Fuse 10A

Ex tern al Fuel Pump
Fuse 3A

O b serve instructions in th e manual

Rep lac e fuses with same type and rating

Whisper D igital D iesel Operatio n Unit

Fig. 8 Control panel.

Fig. 9 Digital Diesel Control unit

2.4.3 Remote control panel

01 Generator load indicator
02 Failure LED
03 Start button
04 Stop button
05 Display
06 Select button
07 Set button

Fig. 10 Digital Diesel remote control panel.

2.5 Technical Information

2.5.1 AC alternator

The tri phase synchronous alternator is directly coupled,
one bearing, brushless, rotating field design, 12 wire, four
pole (1500 RPM) and regulated by an Automatic Voltage
Regulator (AVR).
The exciter stator has a residual magnetism, which
guarantees self-exciting of the generator on start-up (that
thereby generates a residual voltage of about 10%
nominal voltage).
The AVR, powered by an auxiliary circuit on the main
stator, acts on the exciter stator indirectly controlling the
field generated by the main rotor by means of the
sequence exciter rotor - diode bridge - main rotor.
The voltage regulator controls and keeps constant the
average voltage of one phase. The voltage setting on the
AVR can be adjusted with the help of a trimmer “V”
between 185 and 290 Volts. (See par. 5.3.1)
A frequency control progressively deactivates the machine
when the drive motor speed drops below a pre-set,
adjustable threshold preventing over-excitement at low
operating speeds and abating the load engage effects on
the engine.
The AVR works only within limits of the set frequency 50
Hz. When operating below the lower limit of 46 Hz ± 1 Hz
the AVR will stop regulating to avoid overloading the
exciter coil (This setting can be changed with trimmer
“UF”). (See par. 5.3.1)
When applying the generator set at 60 Hz the AVR is re­adjustable as well. To operate at 60 Hz the engine RPM
and Digital Diesel Control settings must also be changed.
For the USA market a dedicated manual (Art. No

50200444) is available for 60 Hz applications. Please refer
to the WhisperPower service centre for specific
instructions to convert the generating set to 60 Hz.
A further option is to readjust the stability of the regulator.
In the event of very irregular (alternating) loads it could be
necessary to change this setting with the help of trimmer
“S” to avoid interference of the regulator and the
alternating load. In conclusion the regulator reaction time
can be modulated to eliminate any voltage instability that
may arise. (See par. 5.3.1)

Fig. 11 Automatic Voltage Regulator (AVR).

3 4 1 2

6 7 5

INFORMATION

EN / M-SQ20 / 25 / November 2010 13

Fig. 12 AVR Trimmers (potentiometers).

The power comes from 12 wires that can be connected in
star, delta or combined double / star and double / delta
arrangements to take off different voltages. For tri phase
400V use, the alternator should be connected in star. For
single voltage 230V use the wires should be connected in
double delta. The alternator is specially designed that in
this way one can take off the full power off the generator.
However the use of three groups of 230 V taken from the
three corners of a single delta arrangement is
recommended. Other voltages (115 Volt) can be arranged
as well. Further technical data on the connections of the
alternator can be found in drawings and diagrams in this
manual.

The tri phase synchronous alternator is directly coupled,
one bearing, brushless, rotating field design, 12 wire, four
pole (1500 RPM) and regulated by an Automatic Voltage
Regulator (AVR).
Residual magnetism causes a small voltage over the
stator windings and allows a current to flow in the
windings, which is magnified because of the feedback
effect between rotor and stator. The field windings in the
rotor are short-circuited over a diode to rectify the current.
A capacitor over an additional winding in the stator which
is at an angle with the power-winding keeps the voltage
stable within 5 % at the specified rpm and provides voltage
fall off with speed, preventing over-excitation at low engine
speeds and softening the effect of load switching to relieve
the burden on the engine.
Further technical data on the design of the alternator can
be found in drawings and diagrams in this manual.

2.5.2 Engine

The M-SQ20 / 25 generating set is based on the
Mitsubishi S4S 4 cylinder 4 stroke diesel engine. The
engine is indirectly injected. The engine is water cooled
and the cooling liquid is cooled by a heat exchanger and
raw (sea) water. The heat exchanger and all other parts
which are in direct contact with the raw (sea) water are
made of seawater resistant material like naval brass and
copper nickel.
The engine has been specially adapted for the
WhisperPower application and is very different from the
standard engine supplied for industrial applications!

2.5.3 Digital Diesel Control system

The standard electrical engine control system is 12 Volt
negative earth, non earth return (ungrounded) is available
as optional. Check your identification data to determine
which system is applied. The system is designed
according to the "energise to run" system. The Digital
Diesel Control is a very advanced microprocessor based
full automatic system. Besides automatic start the system
offers many monitoring options. See the separate Digital
Diesel Control users manual (number 50200261).

The microprocessor unit of the Digital Diesel Control is
located in the black box on top of the AC alternator (see
figure 5).

2.5.4 Battery charger

On the engine is an alternator generating 50 Amp 12V.
This current is rectified to charge the battery. The voltage
is regulated at approx. 14.4V.

2.5.5 Alarms and shut down

In case of malfunctioning this will be indicated by the
failure light, details will be shown on the display and the
engine will be shut down. There are three functions
guarded: oil pressure, oil temperature and exhaust
temperature.
Exhaust temperature too high indicates the cooling water
to be blocked.
All alarm switches are closed when no malfunction occurs.
A contact is cut in the event of an alarm. This means that
the generating set will not work when the alarm switches
are broken or there is a loose wire. The system therefore
is intrinsically safe. The panel will display details about the
alarm.

2.5.6 Monitoring

Refer to the operating of the Digital Diesel Control

INFORMATION

14 November 2010 / M-SQ20 / 25 / EN

2.5.7 Control

The generating set can be operated by push buttons on
the panel on the alternator or by the remote control. By
pushing the START button the control system is activated
and will start the engine automatically. Pushing the STOP
button will stop the engine and the electrical system will be
deactivated. Stopping the engine is executed by the
solenoid that will shut off.

2.5.8 Remote control

All wiring connections from the remote control to the board
are made by plug in connectors.
An intermediate communication cable is in the standard
supply. If necessary an optional longer 8 wire
communication cable can be connected if the standard
length does not suit the required distance. Numerous
remote control units can be put in parallel by using the
connectors on the back of the units. (See installation
instructions)

2.5.9 Hour counter

The remote control offers several timer functions that help
to schedule maintenance.

2.5.10 Load indicator

On the remote control the load will be indicated on the
display and by the LED-bar. The load is measured by
current transformers on the alternator. All phases are
monitored and overload of all phases or just one or two
phases will provoke an alarm or even shut down when the
alarm is ignored.

2.5.11 Fuel specification

The engine must only be used with diesel fuel oil which
conforms to the standards for use in modern diesel
engines. Fuel free from water and contaminants is of the
utmost importance.

2.5.12 Oil informati on

1 Specification:

The oil must be suitable for oil changes as specified in
the maintenance chapter. The Mitsubishi engine must
be run on heavy duty lubricating oil meeting the
requirements of API class CD, CF or CF4.

It is very important to use the correct oil
specification. Very often local oil suppliers
recommend a higher class, because they
assume that a higher class is allowed. This is
not the case. One should not follow these

recommendations. Using the wrong
specification will cause high oil consumption.

2 Oil viscosity:

We recommend a multigrade oil 15W40.

3 Oil capacity:

Excluding the oil filter the content of the crankcase is
9 l. Including the oil filter it is 9.3 l. Note that the
engine may contain some residual oil due to testing at
the factory.
While filling, check the lubricating oil level by means
of the engine oil dipstick. Do not overfill with
lubricating oil as this may have a detrimental effect on
engine performance.

4 Oil pressure

• Minimum at idle 98 kPa (1 kgf/cm²/14psi) (1 bar).

• At 2230 rpm ±300 kPa (3 kgf/cm²/45 psi) (3 bar).

2.5.13 Cooling liquid

The engine is cooled by cooling liquid. The capacity of this
system of the M-SQ20 / 25 is 9.5 litres.

Always use coolant which is compatible with
aluminum components of the cooling system.
Do not mix coolants with different kinds of
chemical compound, as this may cause
congelation of the coolant. In case of doubt
refresh the content of the entire cooling
system.

We recommend not using water but cooling liquid that is
marketed for the use in combustion engines. Cooling liquid
protects the engine against frost to minus 25° C. Also it
protects the engine block against corrosion. One can fill
the engine via the filling cap on the exhaust manifold. Fill
up till the level is just below the filling cap. When the
engine is on temperature the liquid will expand and the
redundant liquid will be pressed into the expansion tank.
This tank has to be filled up till the mark. When cooling
liquid is not available clean fresh water could be used with
an additive of anti freeze. When using water with anti
freeze the right mixture has to be calculated according to
the information of the supplier of the anti freeze. When the
cooling is based on keel cooling or radiator cooling the
capacity of these coolers and piping has to be taken into
account calculating the right mixture.
The cooling liquid in the engine is pressurised and has a
boiling point above 100° C. The temperature switch in the
thermostat housing switches at 110° C. When keel cooling
is applied the cooling system is not pressurised. There
should be a special cap on the manifold without valves
leaving the connection to the expansion tank open. See
the special manual on keel cooling and radiator cooling.

INFORMATION

EN / M-SQ20 / 25 / November 2010 15

2.5.14 Technical data

GENERAL

Model M-SQ20 / 25

RPM 1500 rpm

Alternator 3 phase synchronous (air cooled)

Engine Mitsubishi diesel, model S4S (Japan)

Number of cylinders 4

Displacement 3331 cm3

Bore X stroke 94x120 mm

Combustion air consumption 10 m³/min.

Continuous power 50Hz 25 kW electric power

Cooling system indirect cooling by raw water, 20-25 l/min.

Cooling water pump PTO driven WhisperPower self priming impeller pump, type M16

Fuel lift pump engine Mechanical pump, additional electrical pump available upon request

Starting battery (optional) 110 Ah 12V

Fuel consumption 2-9 litre/hour, load dependent

Control Digital Diesel Control including automatic start/stop

ELECTRICAL SPECIFICATIONS

Output voltage 230/400V 50 Hz alternating current (AC) tri phase re-connectable to take off single

phase or dual voltage

Output rating 50Hz 25kVA at powerfactor cos phi = 1

Voltage tolerance ± 2% (balanced load)

Frequency tolerance ± 3%

Alternator Air cooled, brushless, four pole, twelve wire, synchronous

Voltage regulation: AVR

MECHANICAL SPECIFICATIONS

Supply includes Sound shield with steel base, mounted on rubber anti vibration mounts. (Genset

without sound shield is optional)

Dimensions in sound shield hxwxd 126x68x80 cm

Dimensions without sound shield 115x60x75 cm

Color: metallic silver / grey

Weight with sound shield 580 kg

Weight without sound shield 480 kg

Max. operation angle 25 degrees

Standard supplies Remote panel (+15 m cable), fuel filter, fuel lift pump, user and installation

manuals

Optional Installation kits, mobile (vehicle) version, non earth return, spare part kits, PTO to

drive hydraulic pump

INFORMATION

16 November 2010 / M-SQ20 / 25 / EN

2.5.15 Electrical diagram contr ol wiring M-SQ20 / 25

Fig. 13 Electrical Diagram control wiring M-SQ20 / 25

INFORMATION

EN / M-SQ20 / 25 / November 2010 17

2.5.16 Terminal modes 115VAC – 230VAC - 400VAC 50H

Fig. 14 Terminal modes

INFORMATION

18 November 2010 / M-SQ20 / 25 / EN

2.5.17 Gener ator Diagram 3 phase with AVR 230V – 400V 50Hz with AVR

*

R EFER TO 2.1.3 USER M ANUAL WHIS PER 25U

* TO C ONNEC T NEUTRAL TO GROUND

Fig 15. Generator Diagram 3 phase with AVR 230V – 400V 50Hz with AVR

INFORMATION

EN / M-SQ20 / 25 / November 2010 19

2.5.18 AC Wiring Diagram single phase with AVR 230V Hz (Double Delta)

* TO CO NNECT NEUTRA L TO G ROUND

REFER TO 2.1.3 USER MANUAL WHISPER 25U

Fig 16. AC Wiring Diagram single phase with AVR 230V Hz (Double Delta)

OPERATION

20 November 2010 / M-SQ20 / 25 / EN

3 OPERATION

3.1 General

The generating set is operational after full installation and
filling up with: fuel, engine lubricating oil and cooling liquid,
filling the starter battery with acid (WhisperPower batteries
do not need to be filled up and are sealed), connecting the
remote control panel.

1 Max. oil level;
2 Min. oil level.

Fig. 17 Engine Oil Dipstick markings.

3.2 Operating Instructions

3.2.1 Summarised operating instructions (daily
use)

Routine "pre-start" checks:

1 Check oil level.
2 Water inlet (all valves open).
3 Power source selector switch (off/shore

power/generator power). Switch to power source
switch "OFF", or switch off all consumers in the usual
way. If a Masterswitch is installed, this is operating

automatically.
4 Switch on battery switch (when installed).
5 Fuel valve: open.

Starting:

Push the start button to initiate the full automatic

starting procedure. You can monitor the procedure on

the display.

In operation checks:
1 Check for abnormal noise or vibration
2 Check the voltage
3 Check sea water flow at exhaust outlet
4 Power source selector switch (off/shore

power/generator power). Switch to power source
generator. If a Masterswitch is installed, this is
operating automatically.

5 Before loading the generating set up to maximum,

have it run warm. Continuous load should be
restricted to 70 % of maximum load.

Stopping generator:
1 Switch off all electrical devices (consumers). If the

generating set has been running under full load for a
longer period, do not shut it down abruptly. Reduce
the electrical load to about 30% of the rated load and

let it run for approx. 5 minutes.
2 Press the STOP button.
3 Close the inlet sea water cock.
4 Switch to another 230V/400V power source, if

available. If a Masterswitch is installed, this is done

automatically.

3.2.2 Extended operating instructions

Check when starting the first time or after a longer period
of rest:

1 If there is any damage caused by transport or

installation.
2 Check if installation conforms to the installation

instructions.
3 Ensure the generating set is free to turn without

obstruction.
4 Check all hoses and hose connections for leaks.
5 Check all cables and cable end terminal connections.
6 Check the engine and generator mounting bolts.

Routine "pre-start" checks:
1 Check engine oil level.

The generator switches off in the event of insufficient

oil-pressure. Even when the oil level is too low the oil

pressure can be high enough. Do not run the

generator with the oil below the lowest mark in the,

because a smaller volume of oil will become

contaminated considerably quicker than a larger

volume. Therefore we recommend daily oil-checks.

Check oil level prior to starting the engine or at least 5

minutes after the engine has stopped.

OPERATION

EN / M-SQ20 / 25 / November 2010 21

2 Check sea water cocks. Do not forget the valve of the

water outlet in case of a water/exhaust gas separator.
3 Check the water strainer.
4 Check for leakages.
5 Regularly check the siphon vent in the cooling water

supply.
6 If no Masterswitch is used: Switch main Power Source

Selector switch to "OFF" or switch off all devices.
7 Switch on the battery switch.

Starting the generator:

By pushing the start button briefly the electric system

is activated and the starting procedure will begin. (By

pushing the stop button the system is deactivated)

The first time starting up or after running out of fuel it

could be necessary to prime the fuel system. (See

bleeding fuel system instructions in the maintenance

chapter).

A restart protection prevents starting the engine when it is
already running, which could cause damage.

In the event of starting problems (numerous
attempts are made), close the sea-water inlet
cock while cranking to prevent the outlet
system and engine to fill up with water.

During the starting process, the cooling water pump is
driven with the engine. The cooling water is discharged to
the exhaust outlet, because the engine does not run, the
exhaust pressure is not high enough to expel this water.
Open the valve immediately when the engine starts in
order to prevent damaging the impeller.
Water in the cylinders will cause serious damage to the
engine. For instance; a bent piston rod or a cracked
cylinder head. In fact water in the cylinder is the main
cause for engine damage in pleasure craft.

Checks once the generator is in operation:

1 Check for abnormal noise or vibration.
2 Check the voltage.
3 Check coolant flow.

Always check immediately after starting the generator

if cooling water flows at the exhaust outlet. If this is

not the case, check the cooling water pump. After

having become acquainted with the generator you will

be able to recognise the coolant flowing through the

system by listening for the noise of the water which is

expelled.

Be aware that especially in harbours the
coolant water inlet can easily be blocked by
floating objects.

4 Power source selector switch (off/shore

power/generator power). Switch to power source
generator. If a Masterswitch is installed, this operates
automatically.

Before loading the generating set up to maximum, have it
run warm. The first 50 hours of running the continuous
load should be restricted to 70 % of maxi-mum load.
Running for long periods at no load or light load in the first
50 hours can cause cylinder glazing and high oil
consumption.

Engine load during longer operation:
Please ensure that the generating set is not overloaded.
Overloading occurs when the electrical load (demand) is
so high that the generator cannot be turned around
properly by the diesel engine. Overloading causes the
engine to run rough, while using oil and excessive fuel and
producing soot by the exhaust. The engine can even stop.

The generator should therefore only be loaded at the
maximum rated power for short periods (2-3 hours) only!
The high peak current is meant for the ability to start
electrical devices that need a high current for starting
especially electric motors and compressors (from a still
stand state).

In order to prolong the generating set’s life expectancy, the
nominal electrical demand on the system should be about
70% or the rated generating set’s maximum load. Please
note this when switching on your electrical devices!
Nevertheless, the Whisper is designed so as not to
overheat, even under extreme conditions.

Do not run the generator for very long periods at no load
or at very low load. When this is necessary do load the
generator at least one hour in 10 hours for minimum 70%.
Long term running at too low load will cause the exhaust to
be choked by carbon.

Never remove the battery while the engine is
running or any electrical cable while the
battery is connected in the circuit. Only
disconnect the battery with the engine
stopped and all switches in "OFF" position

OPERATION

22 November 2010 / M-SQ20 / 25 / EN

Stopping the generating set:

1 Avoid stopping of the generator abruptly after a long

period of operation at high load! Doing so, you avoid

unnecessary thermal load to your generating set!

Act as follows:

Prior to switching off the generating set, decrease the

generator load (i.e. turn off most electrical users) and

let the generator run at low load for approx. 5 minutes

to allow the engine to get properly cool (the influent

sea water must flow through the system in order to

cool the engine).

If the generator is operating in a hot environment and

you do not act as given above, the excessive heat in

the engine can trip the "high temp" alarms. In that

case, a restart of the engine is not possible for some

time. It is also recommended to switch off electrical

users prior to stopping the generator because of the

voltage drop that occurs as the engine comes to a

halt. Such voltage drops may cause damage to

electric motors, compressors (in refrigerators or air

conditioners etc.).

2 Press the STOP button.

3 Close the inlet sea water cock.

4 Switch to an other 230V/400V power source, if

available. If a Masterswitch is installed, this is done

automatically.

If the engine is not running and ‘failure’ and
‘charging’ LED is blinking, reset by stop
button, otherwise it will drain the start battery

MAINTENANCE

EN / M-SQ20 / 25 / November 2010 23

4 MAINTENANCE

4.1 Alternator

The alternator does not require any maintenance. Periodic
inspection and cleaning is recommended, depending on
environmental conditions.
However when the alternator has been idle for a long
period attention to winding condition is recommended.
The condition of windings can be assessed by
measurement of insulation resistance to earth. (See 5.3.5
Meggering)
The alternator bearing is greased for life and is therefore
not regreasable

4.2 Engine

4.2.1 Preliminary instructions

All regular maintenance can be carried out when the
enclosure is open. When oil and dirt has gathered in the
enclosure measures have to be taken to avoid spilling oil
and polluting the environment.
The first service on the engine should be carried out after
50 hours of its life and after a major overhaul. In the first
50 hours the engine should receive special attention:

Long periods of light or no load running in the first 50
hours may lead to cylinder glazing and high oil
consumption.

For the same reason it is of the greatest
importance to use the right oil specification.

The first time starting up or after running out of fuel it could
be necessary to prime the fuel system.

4.2.2 Bleeding fuel lines

Ensure there is sufficient fuel. The Whispers are self
bleeding. To check the well functioning release the bleed
screw on the high pressure fuel pump. Turn loose the cap
of the fuel lift pump, and move the piston up and down to
prime the system. Retighten the bleed screw when no
further air bubbles are expelled. Retighten the cap when
ready.

01

02

01 Injection pump air bleeding screw
02 Hand operated fuel lift pump

Fig. 18 Bleeding fuel lines.

4.2.3 Valve clearance

When the engine is in cold condition both valves (inlet and
outlet) should have a clearance of 0.25 mm. The
adjustment has to be done at TDC (see 5.4.2).

4.2.4 Replacing fuel filter

Filter change depends on contamination of the fuel, but
should be done however, at least every 300 running hours.
A clogged filter results in a lack of output of the generating
set.

01

01 Fuel filter

Fig. 19 Location fuel filter cartridge

MAINTENANCE

24 November 2010 / M-SQ20 / 25 / EN

4.2.5 Replacing oil filter

Replacement has to be executed according to the
schedule in this manual. Drain the oil using the sump
pump and put some tissues under the filter.

02

01

01 Engine oil filter
02 Engine oil dipstick

Fig. 20 Location engine oil filter and dipstick.

Fig. 21 Location rubber packing-ring oil filter.

A smear of oil has to be put on the seal of the filter before
fitting the filter. The filter should be fastened manually:
when the rubber touches the metal turn 3/4 further.

4.2.6 Tensioning V-belt

The alternator bracket allows for readjust of the V-belt.
Deflections should be 13 mm (see fig. 22)

Fig. 22 Tension V-belt.

MAINTENANCE

EN / M-SQ20 / 25 / November 2010 25

4.3 Regular maintenance

CHECK DAILY:

• Oil level
Take care the oil level is never below the mark. Do not add
oil when the level is still above the mark.

1 Max. oil level;

2 Min. oil level.

Fig. 23. Engine oil dipstick markings

• Level cooling liquid

• Hoses for loose connections or deterioration.

• Water inlet filter.

• V-belt tension

AFTER FIRST 50 HOURS:

• Change oil and replace the oil filter.

Have the engine run until it is on temperature and
stop it. Replace the filter. Drain oil by the sump
pump into a suitable retainer and fill up with fresh
oil. Start the engine again and have it run for 5
minutes. Stop the engine again and pause for a
few minutes to let the oil gather in the crankcase.
Check the level again and add oil when
necessary.

• Check and tighten nuts, bolts, and unions, paying

particular attention to the fuel system.

• Observe the exhaust at the normal full load. The

exhaust must be free from soot. Do not allow the
engine to run with a dirty exhaust without
investigating the cause as this may result in an
expensive breakdown.

• Check air vent (siphon breaker valve) on a

regular basis. When the air vent it not working
properly, the engine can fill up with water by
siphoning. Water in the combustion chamber
causes serious damage to the engine.

• Check and readjust V-belt.

• Check the electrical connections

EVERY 150 HOURS:

• Change oil.

• Check the battery acid level (not for

WhisperPower batteries).

• Check battery terminals for corrosion

• Check and readjust V-belt

• Check impeller raw water pump (durability

depends on the purity of the sea water. In sandy
water and warm water wear will increase).

When replacing the impeller the gasket between the pump
case and the cover should be replaced as well. So when
ordering a spare impeller order a gasket as well. Remove
the cover to get access to the impeller. Remove the old
impeller with the help of two screwdrivers. Install the new
impeller and add some grease. Turn the blades in the
direction of rotation of the pump.

EVERY 300 HOURS:

• Replace the impeller of the raw water pump.

• Retighten the cylinder head bolts and adjust the

valve clearance. (See paragraph 5.4.2).

• Check air cleaner element.

• Replace the oil filter.

• Replace the fuel filter

Replacement depends or the condition of the
fuel. We recommend replacement every 300
hours.

EVERY 1000 HOURS:

• Replace the V-belt.

• Retighten cylinder head bolts/adjust + check and

adjust valve clearance.

EVERY 2000 HOURS:

• Check lubricating oil pressure

• Clean and check or replace fuel injector nozzles

and check injection pressure.

•

Check the air cleaner element:

The air is taken from the section between the
alternator and the engine

• Check the cooling system:
The engine cooling liquid is indirectly cooled by
raw water via a heat exchanger. The seawater is
pumped by the PTO driven impeller pump. All
parts of the cooling system are of corrosion free
and seawater resistant materials such as naval
brass and copper/nickel. In case of gathering of
dirt in the system it could be cleaned by
compressed air. When overhauling the engine
one could clean the parts thoroughly or replace.

When the generator set runs less than 150 hours a year
the oil should be changed yearly

MAINTENANCE

26 November 2010 / M-SQ20 / 25 / EN

4.3.1 Maintenance schedule

Check oil level daily

Check water inlet filter daily

Check the level of the cooling liquid daily

Check hoses for loose connections or deterioration daily

Change oil and oil filter after first 50 hours

Check and tighten nuts, bolts, etc. after first 50 hours

Check exhaust after first 50 hours

Check air vent after first 50 hours

Check and readjust V-belt after first 50 hours

Check electrical connections after first 50 hours

Change oil 150 hours

Check battery 150 hours

Check air vent 150 hours

Check and readjust V-belt

150 hours

Check impeller water pump 150 hours

Replace impeller water pump 300 hours

Retighten cylinderhead bolts and readjust
valve clearance

300 hours

Replace oil filter 300 hours

Replace fuel filter 300 hours

Check air cleaner element 300 hours

Retighten cylinderhead bolts , adjust valve
clearance 1000 hours
Replace the V-belt 1000 hours

Check lubricating oil pressure 2000 hours

Check injector and injection pressure 2000 hours

Check inlet air filter 2000 hours

Check cooling system 2000 hours

4.3.2 Taking out of service

When not using the generating set for a longer period it is
recommended to execute an engine preservation
procedure.

1 Clean the engine.

2 Loosen the fuel suction pipe and fuel return and put

them in a can with preservation diesel fuel. Start the
engine and run the engine warm.

3 Drain the hot engine oil and refill with preservation oil.

4 Stop the engine and take loose the inlet of the raw

water pump. Drain the water from the water lock.
Crank the engine having the raw water inlet sucking
anti freeze from a can until the pump, heat exchanger
and manifold are filled.

5 The coolant can stay in the engine

6 Disconnect the battery and store it in a place free of

frost and dry and charge it regularly.

7 Close inlet- and outlet openings with tape.

8 Protect the generating set against the influences of

bad weather conditions.

This method of preservation will be sufficient for 6 months.
Change oil before using the engine again.

TROUBLE SHOOTING

EN / M-SQ20 / 25 / November 2010 27

5 TROUBLE SHOOTING

5.1 Alternator/ electrical faults

CAUTION!

Remove 3 Amp. Fuse in the control panel
while working on the generator to prevent the
engine to start

DANGER!
Take care for parts which are live!

5.1.1 General

If any problem should occur, check basic conditions and
examine all external wiring, switch gear and circuit
breakers. Also check if measuring instruments give the
correct value. If in doubt, measure directly on the
alternator terminals with an independent instrument. This
should only be carried out by an experienced electrician. If
during these measurements the engine immediately stops
after starting and an error code is displayed at the remote
control panel ( “AC VOLTAGE”), one can start the
generator by means of a “service start” at the service
menu (see paragraph “service start” of the user’s manualof
the Digital Diesel Control). By doing this, the generator will
keep running for 2 minutes before it stops. This offers you

the possibility to carry out measurements to investigate the
cause of the failure.
Check if the engine is running correctly at 1500 RPM (50
Hz) according to its settings and does as well under load.
A RPM drop of 3% at full load is acceptable. Therefore a
no load setting should be at 1545 RPM = 51.5 Hz. Under
no circumstances should the RPM under full load be below
1485 RPM = 49.5 Hz.
When the problem is in the RPM refer to the engine fault
finding paragraph.
Digital Diesel Control system will help to indicate failures
and display causes.

CAUTION!

If the voltage is set any higher than its
maximum limit, the generator may be
damaged.

If the bottom speed is set at too low a frequency, the
generator may be damaged. On the other hand too high a
frequency can cause voltage drops with high loads.

A failure code is displayed when a hardware failure at the
generator is detected.

Failure code Problem

COMMUNICATION Communication error between the panel end the generator
LOW START BAT Starter battery voltage too low
ALTERNATOR No output battery charging voltage
EXHAUST TEMP Exhaust temperature is too high
WATER TEMP Coolant temperature is too high
OIL PRESSURE Oil pressure failure
LOW VOLTAGE Generator AC output voltage is too low
HIGH CURRENT Generator is in overload
FREQUENCY Output frequency of the generator is too low

5.1.2 Trouble shooting table

PROBLEM CAUSE SOLUTION

No output (Voltage) at all

• Circuit breaker "off" or faulty main fuse

• Faulty fuse of the AVR

Check switches and fuses and measure
directly on the alternator to exclude external
causes. Check fuse of the AVR

• Loss of residual magnetism

Check the residual magnetism, temporally
increase RPM with 15%. Try to and flash the
alternator (see special procedures)

• Low engine RPM.

Check the engine RPM and adjust (see special
procedures).

• Faulty RPM.

Check by independent excitation if the problem
is in the AVR or in the windings and replace if
necessary (see special procedures).

TROUBLE SHOOTING

28 November 2010 / M-SQ20 / 25 / EN

PROBLEM CAUSE SOLUTION

• Rotor diode broken.

Check the diode in the rotor (see special
procedures). The M-SQ20 / 25 has one diode
block/rectifier unit.

Generator output voltage too
low when no load is on it (less
than 225V between phase and
neutral).

• Engine is not reaching the rated RPM. See special procedures to readjust RPM.

• Faulty AVR. When slightly too low,

adjustment could be necessary

Try to readjust AVR. Check by independent
excitation if the problem is in the AVR or in the
windings and replace AVR if necessary (see
special procedures).

• Defective diode

Check the diode in the rotor (see special
procedures). The M-SQ20 / 25 has one diode
block/rectifier unit.

Generator output voltage too
low under load (less than 225V).
In no load condition it is OK

• When applying 3 phase: an
unbalanced load; check the voltage of
the other phases. When the voltages
are different this is caused by an
unbalanced load.

Bring load in balance. When slightly out of
balance, remove the sense wires to the phase
with the highest load and check if the voltage
on the other phases is not too high.

• Engine is not reaching the rated RPM.
Possibly too much load or engine
problems (lack of fuel)

Switch off a load; (part off) consumers
See to engine RPM problems

• Faulty AVR or readjustment necessary

Try to readjust the voltage
Check by independent excitation if the problem
is in the AVR or in the windings and replace
AVR if necessary (see special procedures).

Generator output voltage too
high, (more than 235V)

• Over-energising due to defective AVR
or wrong AVR setting

Check AVR, readjust and replace if necessary
capacitor specification and replace AVR if
necessary (see special procedures)..

Generator output voltage too
high, (more than 235V)
In no load condition it is OK

• Unbalanced load

Bring load in balance.
When slightly out of balance, remove the
sense wires to the phase with the highest load
and check if the voltage on the other phases is
not too low.

Generator voltage fluctuates.

• Disturbances on the electrical system/
user side.

Check if electrical load is fluctuating

• AVR reacts on fluctuating load

Readjust the stability setting on the AVR
trimmer “ST”

• Engine runs irregularly.

When engine runs irregularly see section:
"Engine runs irregularly" at the “Engine faults”
paragraph.

Generator is not able to start an
electric motor

If the generator is unable to supply
enough power to start an AC electric
motor, this is usually because this motor
draws too much current during starting
As the alternator is very much under­rated the problem will appear by the
engine RPM collapsing

Check the electric motor’s current draw
required for starting. This should not exceed
the rated generator output current. This could
be remedied by using a "soft-start". Inquire at
your nearest WhisperPower dealer or directly
at the manufacturer, WhisperPower in the
Netherlands.

5.2 Engine faults

CAUTION!

Remove 3 Amp. fuse in the control panel
while working on the generator to prevent the
engine from starting.

5.2.1 General

Most electrical problems relating to Voltage or Frequency
are due to wrong engine speed.
Note that RPM and Hz are basically the same.
Use the problem solving table to find the cause of a wrong
engine speed. When there is no obvious cause one can
adjust the RPM (see special procedures).
When the engine is not cranking well, starting problems
almost always originate from battery problems or poor
battery cable connections.

TROUBLE SHOOTING

EN / M-SQ20 / 25 / November 2010 29

When the engine is cranking, well starting problems
almost always originate from lack of fuel or air bubbles in
the fuel pipes.

CAUTION!

When the engine does not start instantly,
prolonged cranking can fill up the exhaust
system with cooling water because of the
water injected exhaust. When the water
enters the cylinder through the valves this will

bring severe damage to the engine. When the
engine does not start and repeated cranking
is necessary shut off the seawater inlet. Open
the valve immediately after the engine has
started.

A failure code is displayed when a hardware failure at the
generator is detected.

Failure code Problem

COMMUNICATION Communication error between the panel end the generator
LOW START BAT Starter battery voltage too low
ALTERNATOR No output battery charging voltage
EXHAUST TEMP Exhaust temperature is too high
WATER TEMP Coolant temperature is too high
OIL PRESSURE Oil pressure failure
LOW VOLTAGE Generator AC output voltage is too low
HIGH CURRENT generator is in overload
FREQUENCY output frequency of the generator is too low

5.2.2 Trouble shooting table

PROBLEM CAUSE SOLUTION

Diesel engine fails to crank, it
does not react at all, or the
starter makes clicking noises, or
the engine cranks very slowly

• Almost certainly this is an electrical
problem. One other possibility is that
the engine is locked by water in the
cylinders or there is other severe
damage. Display will indicate “low
battery voltage”.

Check on water in the cylinder and further
damage by cranking. When there is water in
the cylinder, then deactivate the control
system, disconnect the battery, remove the
glow plugs. Crank the engine to remove the
water through the opening of the glow plugs.
Check oil on the presence of water and
change oil. Find out how the water did enter
the cylinder (check the air vent). Take
precautions to prevent it from happening
again. When there is no mechanical
malfunction the problem must be an electric
malfunction.

No reaction at all

• Starter battery switched "OFF".

Check position of the battery switch and switch
"ON".

• Faulty fuse on control panel

Replace fuse

No reaction or clicking noises,
or slow cranking

• Starter battery voltage insufficient
(battery too weak).

Check battery voltage. Recharge the battery.
Inspect battery terminals and cables for a good
electrical connection (inspect against
corrosion, tattered wires, etc.)

• To thick engine lubricating oil.

Change oil for a lower viscosity.

• Starter motor faulty

Repair the starter motor

Starter is turning engine
smoothly, but engine fails to
start

• Out of fuel or faulty fuel, water in the
fuel.

Fill up with fuel or replace with better quality.

• Fuel solenoid is not working.

Check if solenoid comes in; if not check wire
connections and circuitcy to solenoid (see DC
wiring diagram).

• Fuel lift pump is not working.

• Fuel filter is blocked.

• Air in fuel lines.

Check fuel filter and fuel lift pump: clean or
replace if necessary.
Bleed air from fuel system (see maintenance
section).

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30 November 2010 / M-SQ20 / 25 / EN

PROBLEM CAUSE SOLUTION

• Wrong valve clearance.

Adjust valve clearance,

• Low compression because of dirty
valves.

Clean valves. Take off the injection bent and
inspect the outlet port. When little rust in the
port clean the valve by taking off the valve
spring and rotate until clean. When the outlet
port is strongly affected by rust, the exhaust
system is not properly installed (see paragraph

5.4.3). Contact WhisperPower service
department for advice.

• Blocked injector.

Have the injector tested and cleaned if
necessary.

• Loss of compression by wear out or
damage

Repair by WhisperPower service

Engine runs irregularly.

• Unsuitable contaminated fuel

• Lack of fuel.

Fill up with fuel or replace by better quality.

• Choked fuel filter.

Check fuel filter and fuel lift pump: clean or
replace if necessary.

• Disturbances on the electrical system/
user side.

Check if electrical load is fluctuating.

• Faulty fuel lift pump.

Try the pump by manual operation. Repair
when faulty or replace

• Choked air cleaner.

• Lack of air.

Check the air intake

• Choked exhaust system, exhaust
blocked, rubber exhaust hose kinked.

Check the exhaust hose

• Air in the fuel pipes

Bleed air from fuel system (see maintenance
section).

• Blocked injector.

Have the injector tested and cleaned if
necessary.

• Wrong valve clearance.

Adjust valve clearance.

• Temporarily hunting (this will disappear when engine has run in).

Engine speed drops

• Too much oil.

Drain oil to proper level.

• Lack of fuel.

Check fuel supply system: fuel pump and filter.

• Lack of intake air.

Check air intake.

• Choked exhaust system, exhaust
blocked, rubber exhaust hose kinked.

Check exhaust system.

• Generator overloaded

Reduce the electrical load (switch off some
consumers).

• Defective generator (windings,
bearings or other)

Generator must be sent to manufacturer for
repair of damaged bearing or winding.

• Damaged engine

Repair by WhisperPower service

Engine does not stop on
command

• Fuel solenoid is not switching off •

• Loss of control

Faulty Digital Diesel Control unit. Stop the
engine manually by the stop handle.
Check wire connections to fuel solenoid.
Check solenoid function. Replace if necessary

Engine exhaust smokes

• Faint blue smoke - generally the result
of light load

Increase load.

• Heavy blue smoke - caused by
lubricating oil: Overfull oil sump or worn
cylinder bore, stuck broken or worn
piston rings.

Check the oil level.
Check the compression.

• Black smoke –incomplete combustion
caused by: Overload, choked air
cleaner, inlet temperature too high,
unsuitable fuel or water in fuel.

Check air cleaner
Check the fuel .
Check for overload.

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EN / M-SQ20 / 25 / November 2010 31

PROBLEM CAUSE SOLUTION

Engine starts, but stops after 10
seconds

• Protection system stops the engine;
this can be caused by oil pressure
failure, lack of cooling water (exhaust
temperature alarm). Overload, loose
wire or faulty alarm switch. Digital
Diesel Control will help to indicate
failure.

See paragraph 2.5.5. and 3.2.2 for information
on the alarm system. Bypassing the switches
can help to confirm the failure. When there is
no real failure, it could be a faulty alarm switch

Engine stops by itself
(Digital Diesel Control will help
to indicate failures)

• Overload or short circuit.

Switch off the consumers and test for short
circuit.

• Lack of fuel.

Check fuel supply system: fuel lines, pump,
filter, valves, tank level, etc.

• Oil pressure low. (oil pressure switch
tripped).

Check oil level.
Check engine’s oil pressure and have it
repaired by WhisperPower.

• Excessive heat in cooling system
(thermo-switch tripped).

• Lack of cooling water (exhaust switch
tripped).

• Impeller broken.

• Cooling water blocked.

• Water strainer blocked.

• Air or water in the fuel.

• Blocked air or fuel filter.

Check cooling water system flow: water pump,
inlet water filter, coolant flow.

• Loss of compression by wear out or
damage.

Repair by WhisperPower service.

• V-belt broken or loose.

Readjust or replace V-belt

• Thermostat faulty

Check thermostat and replace

Sooty, black exhaust.

• Generator is being overloaded. Digital
Diesel Control will indicate “overload”.

Check electrical load and switch off some
consumers

• Insufficient intake air.

• Choked air cleaner.

Check intake air paths and filter, clean and
replace if necessary.

• Fuel injector faulty.

Replace injector.

• Valve clearance incorrect.

Readjust valve clearance

• Poor fuel quality.

Use better quality diesel.

• Poor quality lubricating oil.

Use better quality oil.

• Continuous running with very low load.

Increase load and have the engine run for a
few hours

Loss of power ● Wrong measurement. Check if the load is measured correctly. Does the Amp meter show

the correct value? When calculating the load by multiplying voltage and amps this should
be done by using the exact values, taking into account the power factor of the consumers.
When any doubt, measure the power directly with an appropriate instrument.

• Overfull oil sump.

Bring the oil to the correct level

• Choked fuel filter.

Replace the fuel filter.

• Choked air cleaner

Check air inlet openings; clean air cleaner.

• Exhaust blocked.

Check the exhaust system.

• Injector blocked.

Have the injector checked.

• Loss of compression, sticking or
damaged piston ring.

Have the compression measured.
Clean or replace the rings.

• Wear out of cylinder.

Have the compression measured and have the
engine overhauled.

Over-temperature

• Overload.

Take away the overload.

• Low level of cooling oil or air in the
cooling system

Fill up with liquid and release air bubbles.
Check if there are air blocks in the system; see
the installation manual

• Water inlet system blocked.

• Broken impeller.

• Water strainer choked

• Heat exchanger choked.

Check the cooling system thoroughly.

• Faulty thermostat Check the thermostat or replace.

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32 November 2010 / M-SQ20 / 25 / EN

Warnings

CAUTION!

Generator must be shut off immediately if:

● Motor RPM suddenly rises or drops.

● Unusual noise comes from generating set.

● Exhaust gases suddenly colour dark.

● Engine failure warning light is on.

5.2.3 Service address

If you cannot correct a problem with the aid of the mal­function table, contact your WhisperPower Service Centre
or WhisperPower Netherlands, tel: INT+31-512-571550.
www.whisperpower.eu.

5.3 Special procedures alternator

5.3.1 Automatic Voltage Regulator (AVR)

The voltage regulator has a ±2% voltage precision in the
machine working range with distortion free loads.
The phase voltage can be adjusted by trimmer “V” (see
figure 24) from 185 to 290V.
The regulator is equipped with a frequency dependant
excitation limiter; the frequency can be calibrated by
trimmer “UF”, which is factory set at 46Hz (56Hz), ±1Hz.
On reaching this frequency, the machine begins to reduce
its voltage until it deactivates for very low frequencies.
A fuse protects the regulator and generator against
overloads and/or faults; a pocket has been provided on the
edge of the board to hold a spare fuse (rapid type 32x6.3
2A).
Another trimmer “ST” allows to adapt the regulator to the
generator parameters.
The regulator has been built to suppress the voltage
surges on releasing the load that are below 20% at
nominal load.

AVR SETTINGS

To select the AVR settings access the control board after
removing the cover. Most adjustments are factory set to
ensure satisfactory results in the operating tests on
commissioning. Further adjustments may be necessary to
ensure optimum operation under specific working
conditions.
If the alternator has to operate at 50Hz the jumper “J”
across the terminals marked “60Hz” has to be left in place,
if it has to operate at 60Hz this jumper should be removed.
The output voltage can be changed by adjusting
potentiometer “V”. Take the generating set to its nominal
speed and turn until the required voltage is obtained. If a
small variation in speed causes a change in voltage, then

the bottom speed protection should first be calibrated. The
voltage reference (orange wires) should be connected:

• to terminals “0” and “115” for an output voltage
between 100 and 140V (factory setting)

• to terminals “0” and “230” for an output voltage
between 200 and 280V.

Fig. 24. Automatic Voltage Regulator (AVR)

To increase the range of available voltages by about 15%
use terminal “Pa” instead of terminal “0”. Caution: if the
voltage is set any higher than its maximum limit the
generator may be damaged.
Setting the bottom speed at 50 (60)Hz: start up rotation of
the generating set adjusting it to obtain a frequency of 46
(56)Hz. Turn trimmer “UF” until the voltage begins to
drop. Restore nominal speed.
Caution: if the bottom speed is set at too low a frequency
the generator may be damaged. On the other hand, too
high a frequency can cause voltage drops with high loads.
If on load voltage fluctuations are experienced adjust
potentiometer “ST”, which modulates the reaction time of
the regulator to external inputs, thereby eliminating any
instability in the alternator-load system.

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EN / M-SQ20 / 25 / November 2010 33

5.3.2 Residual voltage check / excitation
procedure (flashing)

When residual magnetism disappears there is no residual
voltage. Residual magnetism can disappear after the
generating set being out of service for a long period or a
short circuit. This can be solved by exciting the exciter field
coil directly, disconnecting the AVR first. Put 12 Volt
directly over the electronic regulator terminals taking
polarity into account.

Fig.25 Residual voltage check / excitation procedure.

When using the starter battery fuse it and limit the current
with a 30 Ohm resistor. Flashing can be done while the
engine is running and the wiring is connected. When a
variac (variable power supply) is available one should be
able to control the voltage manually.

CAUTION

If the starter set battery is used for exciting
one must take care. A short circuit can cause
heavy sparking, fire and injuries.

When external excitation does not bring back voltage, the
rotating rectifier diodes should be tested and a winding
resistant test should be executed.

5.3.3 Testing rotary rectifier diodes

The diodes in the rotor can be checked with a multimeter.
The diodes are integrated in a rectifier unit. When all
diodes are faulty the alternator will not generate any
voltage. When one or more diodes are faulty the alternator
will produce too low voltage.
The flexible leads connected to the diodes should be
disconnected at the terminal end, and the forward and
reverse resistance checked. A healthy diode will indicate a
very high resistance (infinity) in the reverse direction, and
a low resistance in the forward direction. A faulty diode will
give a full deflection reading in both directions with the test
meter on the 10,000 ohms scale, or an infinity reading in
both directions. In case of faulty diodes replace the

rectifier unit. One can get access to the diode unit by
taking off the backend of the alternator.

Fig. 26. Location rectifier diode block

5.3.4 Winding resistant values

If after establishing and correcting any fault on the AVR
and diodes, and output is still low when separately excited,
then the main rotor, stator auxiliary and exciter stator
winding resistance should be checked as the fault must be
in one of these windings. The respective leads must be
disconnected before taking the readings.
Resistance values should be within 10% of the values
given in the table below:

Resistance M-SQ20 / 25

•

Resistance main stator windings

0.33 Ohm

•

Resistance rotor windings

1.18 Ohm

•

Resistance auxiliary winding

3.85 Ohm

•

Resistance exciter stator winding

18 Ohm

•

Resistance exciter rotor winding

0.18 Ohm

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34 November 2010 / M-SQ20 / 25 / EN

5.3.5 Meggering

One can try to measure resistance between the housing
and the windings with a multimeter which should read
infinity. When readings are infinity but a fault is suspected
one can do a high voltage resistance test (MEGGERING)
This procedure should be carried out by an expert. The
AVR should be disconnected during this test. A 500V
‘Megger’ or similar instrument should be used. The
insulation resistance to earth of all windings should be in
excess of 2 MOhm. Should the insulation resistance be
less than this value, drying out the generator windings is
essential. Drying out can be carried out by direct warm air
(60-80ºC) from a fan heater or similar apparatus into the
generator air inlets or outlets.

5.4 Special procedures engine

5.4.1 Setting the RPM

RPM is set by the manufacturer and should not need
readjustment! However a very slight offset after running in
could occur. RPM can be measured by a frequency meter.
Before readjustment check any other explanation for the
wrong speed. Engine speed is set at the factory at nominal
1500 (50 Hz) RPM. A RPM drop of 5% at full load is
acceptable. Therefore a no load setting should be at ±
1575 RPM = 52.5 Hz. Under no circumstances should the
RPM be under full load below 1470 RPM = 49 Hz. When
no cause can be found for a wrong speed, the setting can
be adjusted:

01

01 Engine speed adjusting screw

Fig. 27 Location engine speed adjustment screw.

It is very important to identify the correct setting assembly
(see fig. 27). The screw is to be locked in position with the
lock-nut.

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EN / M-SQ20 / 25 / November 2010 35

5.4.2 Adjusting valve clearance and
retightening the cylinder head bolts.

Both procedures have to be executed with a cold engine.
When both procedures are executed be sure to retighten
the cylinder head bolts before adjusting the valve
clearance. When retightening the cylinder head bolts,
drain the coolant by removing the coolant drain plug (ref.
to fig. 4).

Loosen the bolts slightly, remove the rocker assembly (the
rocker arms, shaft, and stays) and then retighten the bolts
to the specified torque in the numerical order illustrated
(ref. to fig. 28).

Tightening torque cylinder head bolt: 118 ± 5 Nm

Rocker stay tightening torque: 10-20 Nm

Fig. 28. Cilinderhead bolt tension sequence.

The clearance of both (intake and exhaust) valves should
be 0.25 mm in cold condition. Set the piston of the first
cylinder to be adjusted to top dead centre (T.D.C.) of
compression stroke.
The T.D.C. of compression stroke can be found by
aligning the T.D.C. mark “O” on the crankshaft pulley with
the mark on the gear case
First align the T.D.C. mark for the No. 1 cylinder. Confirm
that the valves do not move up or down when the
crankshaft is turned about 20 degrees in normal and
reverse direction of rotation.

Fig. 29. Checking valve clearance (turning)

If the rocker arms move piston no.1 is on the T.D.C. of the
intake or exhaust stroke. In such case turn the crankshaft

360° in the direction of engine rotation again. No. 1 piston
is now at T.D.C. of the compression stroke.
After adjusting the valves of cylinder 1 adjust the valve
clearance of the remaining cylinders in firing order 1-3-4-2
Turn the crankshaft 180º clockwise from the T.D.C of
cylinder 1 to the T.D.C of cylinder 3. Adjusts the valves of
cylinder 3 and turn the crankshaft further clockwise to the
T.D.C of cylinder 4 and finally to 2.

5.4.3 Measuring exhaust backpressure

The exhaust system must be of adequate size -2 1/2”/ 63
mm - and maximal length (see installation manual). When
any doubt, backpressure has to be measured. An easy
way to measure for back-pressure is to use a water
column.

MA XIMUM

A

69 cm
27 Inc hes

Fig. 30 Measuring exhaust backpressure.

A water column can be made visible in a plastic tube along
a yardstick and fitting the end to a hose connection to fit in
the adaptor on the injection bent after removing the
exhaust temperature switch.

The bent A hanging down should not be to short helping to
damp the pulsating effect of the gas discharge. The water
column should be no more than 27 inches (69 cm.) of
water (1 PSI - 0,07 bar)

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36 November 2010 / M-SQ20 / 25 / EN

5.4.4 Disassembling instructions

It could be necessary for repair or checks to disassemble
the generating set.

Following instructions will help:

1 The design of the M-SQ20 / 25 makes it possible to

do most repairs on the spot. The heat exchanger is
accessible and can be removed. The connections of
the alternator are very accessible as well.

2 The sound shield canopy can be disassembled

according to exploded view below.

Fig. 31 Exploded view soundshield

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EN / M-SQ20 / 25 / November 2010 37

3 To take the generating set out of the canopy all hose

and cable connections have to be taken off. The set is
fixed to its base by four rubber mountings and can be
loosened by removing the four nuts from the bolts of
these mountings. The easiest way to get the
generator out of its capsule is by lifting the set with the
aid of the lifting eyes

4 Taking the generator set from its mounting, or to

replace a mounting can be done according to the
drawing below

Fig. 32 Exploded view rubber mountings

5 Reassembling the generating set one should take

care of alignment, cleaning the surfaces between
engine and alternator and tighten the bolts crosswise
and gradually.

6 Test the generating set first outside its capsule and

check very carefully for leakages before putting it
back in its enclosure.

SPARE PARTS

38 November 2010 / M-SQ20 / 25 / EN

6 SPARE PARTS

A complete parts manual in English is available as an option number: number: 40200187 (***)
A work shop manual in English is available as an option, number: 40200174 (***).

We recommend the following spares for service and maintenance.

• Kit A: parts for regular maintenance parts marked (*) article no. 40201560

• Kit B: parts for maintenance + spare parts: all parts marked (*)+(**) article no. 40201561

• Kit C: parts for "world travellers" all parts marked (*)+(**)+(***) article no. 40201562

ARTICLE NO DESCRIPTION

40206122 Fuel filter (*)

50208120 V-belt (*)

40208121 Oil filter (*)

50230007 Air cleaner element (*)

50208186 Raw water pump complete WhisperPower type M25 (***) (see next pages)

40206254 Impeller + gasket (*) (8+15)

40201812 Cover type M16 (**) (10)

50209018 Bolts cover (**) (1) (6 pcs.)

40206257 Repair kit A. See next pages (**)

40206258 Repair kit B. See next pages

50201553 Heat exchanger complete with appendages (***)

50201551 Water hoses with clamps (**)

50209145 Measuring coil Wh 25, 3 pcs (***)

50208010 Rotary diode three phase (**)

50208015 Alternator bearing including O-ring (**)

50208020 Voltage regulator

40209161 Local control panel (***)

50209199 Digital Diesel Control Unit 3 phase (***)

50212170 Fuses 10 Amps(*)

50212154 Fuses 3 Amps (*)

50212197 Fuses 32 x 6.3 / 2 Amps (*)

50201559 Wiring loom complete (***)

40209102 Digital Diesel Remote control panel (***)

50209133 Cable remote control 15 mtr, including connectors

50208033 Overhaul gasket kit / Seal kit (***)

50208030 Cylinder head gasket kit

50206040 Glow plug, 4 pcs (**)

50208050 Nozzle injector, 4 pcs (**)

50206045 Thermostat (**)

50206038 Gasket thermostat (**)

50208034 Gasket rocker cover (**)

More extensive parts list on the internet: WHISPERPOWER.EU (fast moving parts)

SPARE PARTS

EN / M-SQ20 / 25 / November 2010 39

SPARE PARTS

40 November 2010 / M-SQ20 / 25 / EN

MAINTENANCE LOG

EN / M-SQ20 / 25 / November 2010 41

MAINTENANCE LOG

first service after 50 hours: hour counter: remarks:

next service (every 150 hours): hour counter: remarks:

NOTES

42 November 2010 / M-SQ20 / 25 / EN

NOTES

MAINTENANCE LOG

EN / M-SQ20 / 25 / November 2010 43

NOTES

Kelvinlaan 82, 9207 JB Drachten, Netherlands

Tel : + 31-512-571550 / Fax : + 31-512-571599

www.whisperpower.eu / [e-mail]