Lombardini LGA 280 OHC Series User manual

1
LGA 280 OHC
15.01.2006 15.01.2006
00
WORK SHOP
MANUAL
LGA 280 OHC Series engines,code 1-5302-714
1nd Edition
COMPILER TECO/ATI REG. CODE
1-5302-714
MODEL N°
51130
DATE OF ISSUE
REVISION
ENDORSEDDATE 1

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COMPILER TECO/ATL REG. CODE
1-5302-714
MODEL N°
51130
DATE OF ISSUE
REVISION
ENDORSED
DATE
PREFACE
Every attempt has been made to present within this service manual, accurate and up to date technical
information. However, development on the Lombardini series is continuos. Therefore, the information within this
manual is subject to change without notice and without obligation.
The information contained within this service manual is the sole property of Lombardini. As such, no reproduction
or replication in whole or part is allowed without the express written permission of Lombardini.
Information presented within this manual assumes the following:
1- The person or persons performing service work on Lombardini series engines is properly trained and equipped
to safely and professionally perform the subject operation;
2- The person or persons performing service work on Lombardini series engines possesses adequate hand and
Lombardini special tools to safely and professionally perform the subject service operation;
3- The person or persons performing service work on Lombardini series engines has read the pertinent
information regarding the subject service operations and fully understands the operation at hand.
GENERAL SERVICE MANUAL NOTES:
1- Use only genuine Lombardini repair parts. Failure to use genuine Lombardini parts could result in sub-standard
performance and low longevity.
2- All data presented are in metric format. That is, dimensions are presented in millimeters (mm), torque is
presented in Newton-meters (Nm), weight is presented in kilograms (Kg), volume is presented in liters or cubic
centimeters (cc) and pressure is presented in barometric units (bar).

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DATE OF ISSUE REVISION
DATE ENDORSED
COMPILER TECO/ATL
INDEX
I TROUBLE SHOOTING ____________________________________________________________ Page 7
II WARNING SIGNS - SAFETY INSTRUCTIONS ____________________________________________ 8-9
III ENGINE IDENTIFICATION _____________________________________________________________ 10
IV TECHNICAL FEATURES ______________________________________________________________ 11
V CHARACTERISTICS _______________________________________________________________ 12-13
VI OVERALL DIMENSION ________________________________________________________________ 14
VII MAINTENANCE - RECOMMENDED OIL TYPE - REFILLING ______________________________ 15-17
VIII DISASSSEMBLY/REASSEMBLY _____________________________________________________ 18-57
Air gap adjustment coil - Assembly .................................................................................................................................53
Air shroud and side plates - Disassembly .......................................................................................................................19
Air valve - Assembly .........................................................................................................................................................54
Air valve union ..................................................................................................................................................................24
Alternator stator – Assembly ............................................................................................................................................53
Alternator stator - Disassembly........................................................................................................................................21
Alternator support - Assembly..........................................................................................................................................52
Alternator support - Disassembly.....................................................................................................................................21
Alternator with permanent magnets .................................................................................................................................21
Belt tightener - Reassembly .............................................................................................................................................50
Cable clamp plate for alternator stator – Assembly ........................................................................................................52
Camshaft (head disassembly) ........................................................................................................................................30
Camshaft - reassembly ....................................................................................................................................................48
Camshaft control pulley key – Assembly.........................................................................................................................49
Camshaft dimensional check ...........................................................................................................................................30
Camshaft support - Assembly..........................................................................................................................................49
Camshaft support - Head disassembly............................................................................................................................29
Camshaft support ball bearing - Disassembly from head...............................................................................................34
Camshaft support bearing 17x40x12, distribution side – Assembly .............................................................................40
Camshaft synchronous pulley ..........................................................................................................................................49
Camshaft timing synchronous belt - Extraction...............................................................................................................23
Camshaft toothed synchronous timing pulley .................................................................................................................47
Centrifugal decompression device - Operation with the engine running ........................................................................32
Centrifugal decompression device - Operation with the engine stopped .......................................................................32
Centrifugal decompression device ...................................................................................................................................32
Clearance - Adjustment ....................................................................................................................................................55
Clearance - Check ............................................................................................................................................................54
Coil - Disassembly ............................................................................................................................................................20
Connecting piston pin - Disassembly ............................................................................................................................41
Connecting rod / piston wrist pin lock tension washer - Disassembly............................................................................41
Connecting rod cap - Disassembly .................................................................................................................................41
Connecting rod cap fixing bolts - Disassembly ...............................................................................................................40
Connecting rod equipped with bearings and wrist pin.....................................................................................................43
Cooling air shroud, flywheel side - Assembly..................................................................................................................54
Crankshaft - Disassembly ................................................................................................................................................42
Crankshaft - Reassembly .................................................................................................................................................46
Crankshaft support bearing - Disassembly .....................................................................................................................42
Crankshaft toothed synchronous pulley...........................................................................................................................50
Cylinder .............................................................................................................................................................................45
Cylinder Head - Assembly ................................................................................................................................................48
This manual gives the main instructions on how to repair LOMBARDINI LGA 280 gasoline-
fuelled engines, updated as of January 15, 2006.
INDEX

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DATE OF ISSUE
REVISION
ENDORSED
DATE
INDEX
Cylinder head ....................................................................................................................................................................35
Disassembly of camshaft timing synchronous belt .........................................................................................................22
Driving shaft - Check ........................................................................................................................................................42
Driving shaft timing synchronous belt..............................................................................................................................23
Engine oil - Change ..........................................................................................................................................................18
Engine oil - Refilling..........................................................................................................................................................18
Engine preparation............................................................................................................................................................19
External cover of the lower toothed timing belt - Assembly............................................................................................52
Fan flywheel – Assembly..................................................................................................................................................53
Fan flywheel- Disassembly...............................................................................................................................................20
Gasket between cylinder and head - Assembly...............................................................................................................48
Guide protrusion from cylinder head surface ..................................................................................................................37
Head - Disassembly..........................................................................................................................................................32
Head sump lubrication pipe..............................................................................................................................................25
Housing cover, power take-off side - Disassembly .........................................................................................................27
Insertion of crankshaft bearings on the flywheel side. ....................................................................................................46
Intake manifold - Assembly..............................................................................................................................................56
Internal protective guard for timing belt - Reassembly ...................................................................................................49
Lateral cooling air shroud – exhaust side ........................................................................................................................54
Lateral cooling air shroud – intake side ...........................................................................................................................53
Loaded valve springs - check...........................................................................................................................................39
Lower guard of synchronous timing belt – Disassembly ................................................................................................22
Lower toothed timing belt cover - Assembly....................................................................................................................52
Magnet...............................................................................................................................................................................20
Oil dipstick - Check...........................................................................................................................................................18
Oil filter - Disassembly .....................................................................................................................................................24
Oil level - Check................................................................................................................................................................18
Oil pressure regulating valve............................................................................................................................................28
Oil pressure regulating valve components ......................................................................................................................28
Oil pump cover..................................................................................................................................................................26
Oil pump cover extraction ................................................................................................................................................26
Oil pump rotors .................................................................................................................................................................27
Oil seal ring 17x40x7 for camshaft support, distribution side – Assembly ...................................................................40
Oil seal ring for camshaft support, distribution side – Disassembly .............................................................................40
Oil seal ring in flywheel side housing – Assembly ..........................................................................................................46
Oil seal ring in flywheel side housing - Disassembly ......................................................................................................46
Oil sealing ring insertion...................................................................................................................................................26
Oil sealing rings on valve stem - Disassembly................................................................................................................34
Oil sump - Disassembly ...................................................................................................................................................25
Pin diameters – Threads – Connecting radius (mm) - Check.........................................................................................43
Piston and connecting rod - Disassembly .......................................................................................................................41
Piston and Connecting Rod..............................................................................................................................................47
Piston and piston rings - Check .......................................................................................................................................44
Power take-off side cover - Assembly..............................................................................................................................47
Power take-off side cover - Disassembly.........................................................................................................................28
Recirculation vent system ................................................................................................................................................24
Retaining rings – Check for wear .....................................................................................................................................44
Retaining rings – Correct installation direction................................................................................................................45
Sealing ring extraction (30x47x7).....................................................................................................................................26
SPACO Carburetor type FSY 22 - Assembly ..................................................................................................................57
Spark plug - Assembly......................................................................................................................................................56
Spark plug - Tightening ....................................................................................................................................................56
Starting motor locking clip................................................................................................................................................57
Starting motor: SICE 0001A/NO 12 V 0,25 Kw R.sx - Assembly ...................................................................................57
Synchronous timing belt ...................................................................................................................................................51
Synchronous timing belt ...................................................................................................................................................51
Tappet and seat dimensional check (mm) ......................................................................................................................33
Tappet cover - Assembly..................................................................................................................................................56
Tappet cover disassembly................................................................................................................................................29
Tappets - Removal ...........................................................................................................................................................33
Tappets..............................................................................................................................................................................33
Timing belt external cover - Disassembly........................................................................................................................21
Timing belt internal cover - Disassembly.........................................................................................................................23
Timing diagram.................................................................................................................................................................31
Timing synchronous belt - Disassembly ..........................................................................................................................22

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INDEX
Timing system: camshaft synchronous pulley ................................................................................................................50
Timing system: crankshaft synchronous pulley ..............................................................................................................51
Valve clearance adjusting pads - Correct assembling order ..........................................................................................33
Valve guides - Assembly ..................................................................................................................................................37
Valve guides - Check ........................................................................................................................................................36
Valve guides - Removal....................................................................................................................................................37
Valve guides – Seats - Replacement ...............................................................................................................................37
Valve housings and seats - Dimensions..........................................................................................................................39
Valve seats........................................................................................................................................................................38
Valve springs - Check.......................................................................................................................................................39
Valve stem seal rings positioned on the valve guides – Assembly Ref. no. 4535.015 ................................................39
Valves - Check ..................................................................................................................................................................35
Valves - Disassembly .......................................................................................................................................................34
Wrist pin housing in piston - Check .................................................................................................................................34
IX LUBRICATION SYSTEM __________________________________________________________ Page 58
LUBRICATION SYSTEM ________________________________________________________________________58
X ELECTRICAL SYSTEM ________________________________________________________ Page 59-67
Alternator efficiency check with engine running ............................................................................................................. 65
Check continuity of alternator with stopped motor......................................................................................................... 64
Checking the ground insulating alternator with engine stopped .................................................................................... 64
Coil check : engine not started........................................................................................................................................ 64
Electrical starting system 180 W diagram...................................................................................................................... 59
Electronic ignition ............................................................................................................................................................ 63
Electronic ignition: operating principle............................................................................................................................ 63
Starting motor – Brushes replacement ........................................................................................................................... 61
Starting motor – Brushes replacement ........................................................................................................................... 62
Starting motor – Clutch pinion replacement ................................................................................................................... 61
Starting motor – Exploded view ...................................................................................................................................... 61
Starting motor .................................................................................................................................................................. 60
Tension control checking (engine started)...................................................................................................................... 65
XI INYECTION SYSTEM _________________________________________________________ Page 68-71
Carburettor type SPACO : FSY 22.................................................................................................................................. 68
Fuel system...................................................................................................................................................................... 68
Idling circuit...................................................................................................................................................................... 69
Maximum operation ......................................................................................................................................................... 70
Progression system ......................................................................................................................................................... 70
Starter circuit.................................................................................................................................................................... 71
XII STORAGE __________________________________________________________________ Page 72-73
XIII INSTALLATION - INCLINATION LIMITS OF OPERATION_______________________________ Page 74
XIV TORQUE SETTINGS - TORQUE SPECIFICATIONS ________________________________ Page 75-77
XV SPECIAL TOOLS_____________________________________________________________ Page 78-79

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DATE OF ISSUE
REVISION
ENDORSED
DATE
ITROUBLE SHOOTING
TROUBLE SHOOTING
Listed below are some of the possible causes of engine operating defects.
Carry out simple tests before proceeding with disassembly operations or making substitutions.
POSSIBLE CAUSES
TROUBLE
Unstable engine operation.
Poor combustion
Noisy
No power
Starts and stops
White smoke
Black smoke
Hunts
Consumes excessive oil
Overheats
Does not accel.
Spark plug fais to spark
High oil pressure
Low oil pressure
The engine does not start
IGNITION
FUEL CIRCUIT
Grounded sparking plug
Disconnected or broken
spark cable
Faulty coil
Faulty rotor
Loosened or oxidized cable
clamp
Demagnetized flywheel
Clogged piping
Clogged fuel filter
Presence of air in the fuel circuit
Clogged tank breather
(cap)
Clogged carburettor breathers
Dirty carburettor
Blocked carburettor needle valve
Low battery
Faulty starting switch
Faulty starting motor
Air filter clogged
Excessive idle operation
Incomplete running-in
Engine overloaded
Clogged flywheel and sidewalls
Adjust carburetion
Low idling setting
Worn or blocked piston rings
Worn or blocked cylinder
Sticking valves
Excessive valve clearance
Broken timing belt
Oil level too high
Pression regulating valve jammed or
dirty
Worn oil pump
Air in oil intake pipe
Defective pressure gauge or pressure switch
Oil intake pipe clogged
Oil filter clogged
ELECTRICAL
SYSTEM
MAINTENANCE
ADJUSTMENTS/
ENGINE REPAIR
LUBRIFICATION
CIRCUIT

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DATE OF ISSUE REVISION
DATE ENDORSED
COMPILER TECO/ATL
II WARNING SIGNS - SAFETY INSTRUCTIONS
Failure to comply with these
instructions may result in
damages to persons and
property.
Failure to comply with these
instructionscanleadtotechnical
damage to the machine and/or
installation.
DANGER
WARNING SIGNS
CAUTION
•Lombardini engines are built to provide safe and longlasting performances, but in order to obtain these results it is
essential that the maintenance requirements described in the manual are observed along with the following safety
recommendations.
•The engine has been built to the specifications of a machine manufacturer, and it is his responsibility to ensure that all
necessary action is taken to meet the essential and legally prescribed health and safety requirements. Any use of the
machine other than that described cannot be considered as complying with its intended purpose as specified by
Lombardini, which therefore declines all responsibility for accidents caused by such operations.
•The following instructions are intended for the user of the machine in order to reduce or eliminate risks, especially those
concerning the operation and standard maintenance of the engine.
•The user should read these instructions carefully and get to know the operations described. By not doing so he may
place at risk his own health and safety and that of anyone else in the vicinity of the machine.
•The engine may be used or mounted on a machine only by personnel suitably trained in its operation and aware of the
dangers involved. This is particularly true for standard and, above all, special maintenance work. For special
maintenance contact personnel trained specifically by Lombardini. This work should be carried out in accordance with
existing literature.
•Lombardini declines all responsibility for accidents or for failure to comply with the requirements of law if changes are
made to the engine’s functional parameters or to the fuel flow rate adjustments and speed of rotation, if seals are
removed, or if parts not described in the operating and maintenance manual are removed and reassembled by
unauthorized personnel.
•In addition to all other machine specifications, ensure that the engine is in a near horizontal position when starting. lf
starting manually, ensure that the necessary operations can be performed without any risk of striking against walls or
dangerous objects. Rope starting (except for recoil rope starting) is not permitted even in emergencies.
•Check that the machine is stable so that there is no risk of it overturning.
•Get to know the engine speed adjustment and machine stop operations.
•Do not start the machine in closed or poorly ventilated environments. The internal combustion process generates carbon
monoxide, an odourless and highly toxic gas, so spending too long a time in an environment where the engine
discharges its exhaust products freely can lead to loss of consciousness and even death.
•The engine may not be used in environments containing flammable materials, explosive atmospheres or easily
combustible powders, unless adequate and specific precautions have been taken and are clearly stated and certified for
the machine.
•To prevent the risk of fire, keep the machine at a distance of at least one metre from buildings or other machines.
•Children and animals must be kept at a sufficient distance from the machine to prevent any danger resulting from its
operation.
SAFETY INSTRUCTIONS

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DATE OF ISSUE
REVISION
ENDORSED
DATE
II
WARNING SIGNS - SAFETY INSTRUCTIONS
•Fuel is flammable, so the tank must be filled only when the engine is turned off. Dry carefully any fuel that may have
spilled, remove the fuel container and any cloths soaked in fuel or oil, check that any sound-absorbing panels made of
porous material are not soaked with fuel or oil, and make sure that the ground on which the machine is located has not
absorbed fuel or oil.
•To start the engine follow the specific instructions provided in the engine and/or machine operating manual. Do not use
auxiliary starting devices not originally installed on the machine (e.g. Startpilot systems which utilise ether etc.)
•Before starting, remove any tools that have been used for carrying out maintenance work to the engine and/or the
machine and check that any guards removed have been replaced. In cold climates it is possible to mix kerosene with the
diesel fuel to make the engine easier to start. The liquids must be mixed in the tank by pouring in first the kerosene and
then the diesel fuel. Consult Lombardini technical office for mixture proportions. Petrol may not be used because of the
risk of it forming flammable vapours.
•During operation the surface of the engine reaches temperatures that may be dangerous. Avoid in particular all contact
with the exhaust system.
•Before carrying out any work on the engine, turn it off and allow it to cool down. Do not perform any operation while the
engine is running.
•The liquid cooling circuit is under pressure. Do not carry out any checks before the engine has cooled down, and even
then open the radiator cap or the expansion tank cautiously. Wear protective clothing and glasses. lf there is an electric
fan, do not approach the engine while it is still hot as the fan may come on even when the engine is not running. Clean
the cooling system with the engine turned off.
•While cleaning the oil bath air filter, check that the oil is disposed of in such a way as not to harm the environment. Any
filtering sponges in the oil bath air filter should not be soaked with oil. The cyclone pre-filter cup must not be filled with oil.
•Since the oil must be emptied out while the engine is still hot (approx. 80°C), particular care should be taken in order to
avoid burns. In any case make sure that oil does not come into contact with your skin because of the health hazards
involved.
•Check that the discharged oil, the oil filter and the oil contained in the oil filter are disposed of in such a way as not to
harm the environment.
•Close the fuel tank filler cap carefully after each fílling operation. Do not fill the tank right up to the top, but leave
sufficient space to allow for any expansion of the fuel.
•Fuel vapours are highly toxic, so fill up only in the open air or in well ventilated environments.
•Do not smoke or use naked flames while filling.
•Take care when removing the oil filter as it may be hot.
•The operations of checking, filling up and replacing the cooling liquid must be carried out with the engine turned off and
cold. Take particular care if liquids containing nitrites are mixed with others not containing these compounds as this may
give rise to the formation of nitrosamines which are a health hazard. The cooling liquid is polluting, so dispose of in a
manner that does not damage the environment.
•During operations which involve access to moving parts of the engine and/or removal of the rotary guards, disconnect
and insulate the positive cable of the battery so as to prevent accidental short circuits and activation of the starter motor.
•Check the belt tension only when the engine is turned off.
•In order to move the engine use exclusively the eyebolts fitted for this purpose by Lombardini. These lifting points are
however not suitable for the entire machine, so in this case use the eyebolts fitted by the manufacturer.

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MODEL N°
51130
DATE OF ISSUE REVISION
DATE ENDORSED
COMPILER TECO/ATL
III
Serial
number Customer
code ("K" No.)
Engine type RPM
ENGINE IDENTIFICATION
LGA280 SPECIFICATIONS
-Type of engine : Endothermic engine
- 8 and 4-stroke cycle
- OHC driven by toothed belt, timing synchronized throught toothed belt
- Forced-air cooling system with fan flywheel
- Lubrication system: fully forced by trochoidal pump
- Electrical starting with motor (1,1 kW)
- Centrifugal decompression device
- Cast iron liner incorporated in the casting
Rated power

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IV
LGA 280 OHC
1
74
64
275
8 ÷ 1
6200
6,4@4400
16,4@2800
1.6
1.7
0.8
30.5
1
74
64
275
8 ÷ 1
6200
6,2@4400
15,4@2900
1.6
1.7
0,8
30.5
1
74
64
275
8 ÷ 1
6200
5,5@4400
14,3@3000
1.6
1.7
0.8
30.5
LGA 280
GPL LGA 280 CNG
Champion RC12YC
N.
mm
mm
Cm³
RPM
kW/RPM
Nm/RPM
lt.
lt.
g/kW.h
Kg.
TECHNICAL FEATURES
Cylinder
Bore
Stroke
Displacement
Compression ratio
Max R.P.M. at no-load
Rating kW N DIN 70020
Max torque
Oil capacity (without filter)
Oil capacity (with filter)
Oil consumption
Dry weight
Spark plug
Ignition system
TECHNICAL FEATURES LGA 280 OHC
ENGINE TYPE LGA 280
GASOLINE
Electronics Electronics Electronics

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DATE ENDORSED
COMPILER TECO/ATL
VCHARACTERISTICS
CHARACTERISTICS POWER, TORQUE
N Power curve - 80/1269/CEE - ISO 1585
Mt Torque curve
N (80/1269/CEE - ISO 1585) AUTOMOTIVE RATING : Intermittent operation with variable speed and variable load.
The above power values refer to an engine fitted with air cleaner and standard muffler, after testing and at the environmental conditions of 20°C and
1 bar.
Max. power tolerance is 5%.
Power decreases by approximately 1% every 100 m di altitude and by 2% every 5°C above 20°C.
Note: Consult LOMBARDINI for power, torque curves at rates differing from those given above.
LGA 280 GASOLINE

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V
LGA 280 LPG LGA 280 CNG
CHARACTERISTICS
CHARACTERISTICS POWER, TORQUE
N Power curve - 80/1269/CEE - ISO 1585 N Power curve - 80/1269/CEE - ISO 1585
Mt Torque curve Mt Torque curve
N (80/1269/CEE - ISO 1585) AUTOMOTIVE RATING : Intermittent operation with variable speed and variable load.
The above power values refer to an engine fitted with air cleaner and standard muffler, after testing and at the environmental conditions of 20°C and 1
bar.
Max. power tolerance is 5%.
Power decreases by approximately 1% every 100 m di altitude and by 2% every 5°C above 20°C.
Note: Consult LOMBARDINI for power, torque curves at rates differing from those given above.

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DATE ENDORSED
COMPILER TECO/ATL
VI OVERALL DIMENSIONS - OPTIONAL P.T.O. AND FLANGES
OVERALL DIMENSIONS
Note: The values are given in mm

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DATE
VII
1 10 20 30 40 50 60 70 80 90 100
Failure to carry out the operations described in the table may lead to technical damage to the machine
and/or system
MAINTENANCE - RECOMMENDED OIL - FUELS AND LUBRICANTS
(*) Once removed, the timing belt must be replaced, even if it has not reached its scheduled change interval.
Keep the same maintenance intervals above 100.000 km.
Even if the set mileage has not been reached, replace the following :
- engine oil after one year
- timing belt after four years
To avoid explosions or fire outbreaks, do not smoke or use naked flames during the operations.
Fuel vapours are highly toxic. Only carry out the operations outdoors or in a well-ventilated place.
Keep your face well away from the plug to prevent harmful vapours from being inhaled. Dispose of fuel in
the correct way and do not litter as it is highly polluting
PROCEDURE ELEMENT FREQUENCY x 1.000 Km
Every 1.000 Km
CHECK
ENGINE OIL LEVEL
COOLING SYSTEM
AIRCLEANER
FUELPIPESANDUNIONS
EXHAUST SYSTEM
CANDELE -SPARK PLUGS
VALVE CLEARANCE
ENGINE OIL
LUBEOIL FILTER
FUEL FILTER
AIRCLEANERCARTRIDGE
SPARK PLUGS
TIMING BELT (*)
Oil filter replacement.
MAINTENANCE EXTRAORDINARY AFTER THE FIRST 1.000 Km
Engine oil replacement.
REPLACEMENT
ORDINARY MAINTENANCE FOR ENGINES LGA 280 OHC
Every 5.000Km

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VII
FUEL
Use PREMIUM gasoline or UNLEADED PREMIUM gasoline of the type used in cars. Use of other types of fuel
could damage the engine.
The octane rating of the fuel must be higher than 95 to prevent difficult starting.
Do not use old, dirty gasoline or oil-gasoline, water-gasoline mixtures since this would cause serious engine faults.
The engine could be damaged if allowed to operate with insufficient oil quantity .
The lubrication oil influences the performances and life of the engine in an incredible way.
Use of an inferior quality oil or failure to regularly change the oil will increase the risk of piston seizure, may make the
compression rings jam and will lead to rapid wear on the cylinder liner, the bearings and all other moving parts. Engine life
will also be notably reduced.
Oil viscosity must suit the ambient temperature in which the engine operates.
Old oil can cause skin cancer if repeatedly left in contact with the skin and for long periods of time. If contact with the oil
is inevitable, you are advised to thoroughly wash your hands with soap and water as soon as possible.
Appropriate protective gloves etc should be wore during this operation.
Old oil is highly polluting and must be disposed of in the correct way. Do not litter.
SAE CLASSIFICATION
In the SAE classification, oils differ on the basis of their viscosity, and no other qualitative characteristic is taken into
account.
The first number refers to the viscosity when the engine is cold (symbol W = winter), while the second considers
viscosity with the engine at régime.
The criteria for choosing must consider, during winter, the lowest outside temperature to which the engine will be
subject and the highest functioning temperature during summer.
Single-grade oils are normally used when the running temperature varies scarcely.
Multi-grade oil is less sensitive to temperature changes.
Sae grade
* Mineral base ** Semi-synthetic base *** Synthetic base
MAINTENANCE - RECOMMENDED OIL - FUELS AND LUBRICANTS

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DATE
VII
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CF CE CD CC CB CA SA SB SC SD SE SF SG
L - 2104 D / E L - 46152 B / C / D / E
SH
API SJ SLCH-4 CG-4 CF-4 CF-2
MIL
1,7
1,6
LGA 280
AGIP SINT
2000 15W40/50
API SJ/CF
ACEA A3-98 B3-98
MIL-L-46152 D/E.
MAINTENANCE - RECOMMENDED OIL - FUELS AND LUBRICANTS
LUBRICANT INTERNATIONAL SPECIFICATIONS
They define testing performances and procedures that the lubricants need to successfully respond to in several engine
testing and laboratory analysis so as to be considered qualified and in conformity to the regulations set for each
lubrication type.
A.P.I : ( American Petroleum Institute )
MIL : Engine oil U.S. military specifications released for logistic reasons
ACEA : European Automobile Manufacturers Association
The following table is a useful reference when buying engine oil.
Codes are usually printed-out on the oil container and the understanding of their meaning is useful for comparing
different brands and choosing the kind with the right characteristics.
Usually a specification showing a following letter or number is preferable to one with a preceding letter or number.
An SF oil, for instance, is more performing than a SE oil but less performing than a SG one.
ACEA REGULATIONS - ACEA SEQUENCES
API / MIL SEQUENCES
PETROL
A1 = Low-viscosity, for frictions reduction
A2 = Standard
A3 = High performances
LIGHT DUTY DIESEL ENGINES
B1 = Low-viscosity, for frictions reduction
B2 = Standard
B3 = High performances (indirect injection)
B4 = High quality (direct injection)
DIESEL PETROL
OBSOLETE
CURRENT
HEAVY DUTY DIESEL ENGINES
E1 =OBSOLETE
E2 =Standard
E3 =Heavy conditions (Euro 1 - Euro 2 engines )
E4 =Heavy conditions (Euro 1 - Euro 2 - Euro 3 engines )
E5 =High performances in heavy conditions (Euro 1 - Euro
2 - Euro 3 engines )
OIL VOLUME AT MAX LEVEL WITH OIL FILTER
OIL VOLUME TO THE MAX. LEVEL WITHOUT OIL FILTER
Litres
Litres
specifications
In the countries where AGIP products are not available, use oil API SJ/CF for engines with oil specifications corresponding
to the military standards MIL-L-46152 D/E.
PRESCRIBED LUBRICANT
LGA 280 ENGINES OIL CAPACITY

18 00
15.01.2006 15.01.2006
REG. CODE
1-5302-714
MODEL N°
51130
DATE OF ISSUE REVISION
DATE ENDORSED
COMPILER TECO/ATL
1
2
3
4
VIII
Engine oil - Change
Before changing oil, start the engine in order to raise the lubricant
temperature.
This operation will make it more fluid and facilitate its discharge.
Openthe oil sump drainplug and wait tillthe spent oil hasbeen drained
completely.
Engine oil - Refilling
For refilling, use a clean funnel and pour oil slowly in order to avoid
spilling and overflowing.
See page 17 for information about recommended oil and capacity.
Oil level - Check
Oil refilling and check must be carried out with the engine turned off,
not tilted and on a perfectly flat surface.
Oil dipstick - Check
Donot refill theengine withquantity greater thanindicated. Referto the
MIN and MAX notches marked on the dipstick.
Acorrect quantity isreached when oillevel is betweenthetwo notches.
DISASSEMBLY/REASSEMBLY

19
00
15.01.2006 15.01.2006
COMPILER TECO/ATL REG. CODE
1-5302-714
MODEL N°
51130
DATE OF ISSUE
REVISION
ENDORSED
DATE
VIII
5
6 7
DISASSEMBLY/REASSEMBLY
DISASSEMBLY AND REASSEMBLY
Beside disassembly and reassembly operations, this chapter also includes checks, setting up, dimensions, repairs and running
instructions.
It is necessary to use LOMBARDINI original spare parts for a correct repair.
General information for a correct repair
Any change to the intake or exhaust systems (e.g. air filter or muffler type, hose length and diameter, etc.) also implies
a carburetion adjustment. Lombardini will not be held responsible for engine malfunctions and damages arising from
any such changes.
Fora safeand reliableoperation, strictlykeep to theinstructions detailedin themaintenance manualas wellas tothe information
below:
- Lock the machine before disassembling the engine.
- Disconnect battery cables if engine is equipped with an electrical starting system.
- Always use suitable tools, in order to avoid damaging engine parts.
- To separate coupled parts, use plastic hammers or punches only.
- During disassembly, mark the parts that are not provided with reference points.
- Clean the disassembled parts with gasoline and compressed air.
- Always replace gaskets, oil sealing rings, washers and locknuts;
- Before reassembling, lubricate all moving parts and mating surfaces.
- When tightening screws, keep to the torque specified.
During repairs, when compressed air is used, always wear goggles.
Engine preparation
After removing oil, place engine on a workbench and start
disassembling its external parts: carburettor, shroud, air shroud
side plates for engine cooling.
The carburettor, complete of curve, must be disassembled from the
head side after removing the two M8 retaining nuts.
Air shroud and side plates - Disassembly
To disassemble the air shroud, unscrew the two sets of four 6x1x12
bolts both in the upper and lower parts.
Theairshroud platesonbothsides, intakeandexhaust,are fixedtothe
cylinder by means of four 6x1x12 bolts and two 6x1x12 bolts,
respectively.

20 00
15.01.2006 15.01.2006
REG. CODE
1-5302-714
MODEL N°
51130
DATE OF ISSUE REVISION
DATE ENDORSED
COMPILER TECO/ATL
9
VIII
10
8
Coil - Disassembly
To disassemble the coil easily, turn the flywheel so that the magnetic
force of magnet and coil do not interfere.
Unscrew the two M6x25 stop fastening nuts.
During disassembly, work carefully to prevent the flywheel from
falling and causing risks to the operator.
Fan flywheel- Disassembly
To prevent the flywheel from turning during disassembly, use a collar
or similar tool.
Loosen the locking nut by turning it anti-clockwise (the threading is of
the right-handed type), remove the washer and the flywheel by using
the extractor serial number 1460.200 (page 79).
Check that the conic surface of the crankshaft coupling hole, the key
and the key seat are in good conditions.
Check that the cooling fan blades are intact.
If checks reveal any unusual condition, replace the flywheel.
Magnet
The magnet cannot be disassembled from the flywheel side since
this would cause its partial demagnetizing.
Once the flywheel is disassembled, use a ductile iron plate to close the
magnetic circuit between magnet and flywheel. When demagnetized,
the magnet cannot be replaced: Refer to a repair shop – equipped with
a magnetizing device – to have it remagnetized.
Ring gear for electrical starting with motor - Assembly and
disassembly
Check that the gear teeth are not worn or damaged, since their bad
condition would damage the starting motor.
If necessary, replace the ring gear: drill a series of holes close to one
anotheronseveralpointsoftheringcircletoweakenthepiece,thenuse
a chisel to remove it.
To reassemble the new ring gear, slowly heat it for approx.15÷20
minutesup to300° C max.Insert thering gearinto the flywheel,making
sure it is evenly placed against the seat shoulders and let it slowly cool.
If it is necessary to disassemble the ring gear, do not heat the flywheel
to avoid damaging the magnet beyond repair.
DISASSEMBLY/REASSEMBLY