Lombardini Focs Engine Series Workshop Manual (tp6776)

These Lombardini Focs engines usually live in compact equipment—small generators, light towers, pumps, and site machines that sit in dust, mud, and vibration all day. This workshop manual is what I’d keep open on the bench when I’m tearing one down for a full overhaul or chasing a hard-start problem after the unit’s been run hot. For example, if a pump set comes in burning oil and down on power, this book walks you through stripping the engine, checking wear points, and putting it back together so it starts clean and doesn’t come straight back with new leaks.

Applications & Use Cases

Plan a full teardown so you remove ancillaries, head, and bottom end in a safe, logical order.
Inspect key components—valve train, pistons, seals—using the manual’s checkpoints to decide what must be replaced.
Reassemble and align housings, brackets, and linkages so everything lines up and belts, shafts, and controls run true.
Trace and isolate faults like hard starting, smoke, or noise by following systematic checks instead of guessing.
Verify final setup after rebuild: torques, clearances, and running checks to prevent rework once the engine is back in service.

FAQ

Q: Can I use this manual on a tablet at the jobsite?

A: Yes, it works well digitally; you can zoom diagrams and keep it open next to the machine while you work.

Q: Is it worth printing sections of this manual?

A: For messy teardown jobs, printing the pages you need and keeping them in a sleeve near the bench saves your device and speeds reference.

Safety Note

Always follow the manual’s lockout, lifting, and hot-engine precautions before opening, removing, or refitting any engine components.

📘 Show Index

Lombardini Focs Engine Series Index:

GENERAL REMARKS AND SAFETY INFORMATION
GENERAL SAFETY DURING OPERATING PHASES
GENERAL SERVICE MANUAL NOTES
GLOSSARY AND TERMINOLOGY .
SAFETY AND ENVIRONMENTAL IMPACT
SAFETY AND WARNING DECALS .
SAFETY REGULATIONS
WARRANTY CERTIFICATE.
TECHNICAL INFORMATION
MANUFACTURER AND ENGINE IDENTIFICATION
OVERALL DIMENSION
PERFORMANCE DIAGRAMS
TECHNICAL SPECIFICATIONS .
TROUBLE SHOOTING
MAINTENANCE – RECOMMENDED OIL TYPE – REFILLING
ACEA Regualtions – ACEA Sequences
API / MIL Sequence
COOLANT .
FUEL SPECIFICATIONS
International specifications.
LUBRICANT
PRESCRIBED LUBRICANT
ROUTINE ENGINE MAINTENANCE .
SAE Classification .
DISASSEMBLY / REASSEMBLY.
Air filter support
Ait restriction switch
Altemator/Cooling fan belt drive
Big end bearing _
Camshaft journals and housings – Dimensions
Camshaft lobe measurement
Camshaft timing – Belt Reassembly
Camshaft timing Belt Tightening and Fastening .
Camshaft timing – Belt tightening tool ,
Camshaft timing pulley – Disassembly/Assembly ,
Camshaft timing pulley – Reference marks
Camshaft, disassembly .
Camshaft, journal and housing measurement
Central main bearing caps .
Check the clearances between the bearings and the joumal.
Clearances between the bearings and corresponding pins .
CONNECTING ROD
Connecting rod alignment
Connecting rod with bearings and pin .
Connecting tod, weight. „
Cooling ran .
Crankcase breather LOW
Crankcase vacuum regulator valve —
Crankshaft axial clearance –
Crankshaft front and back oil seal rings .

Crankshaft timing pulley.
Crankshaft, check journals and
Crankshaft, lubrication lines.
Cylinder head assembly
Cylinder head tightening procedure LOW 1204-1204!T-1404 .
Cylinder head tightening procedure LDW 502-602-702A3-1003
CYLINDER HEAD. removal.
Cylinder roughness .
Cylinder.
CYLINDERS
Driving pulley .
Dry type air filter
E.G.R. Circuit
Exhaust maniflod .
Fuel rail .
Fuel tank (optional).
Governor springs —
Governor springs for Gensets
Head gasket
Hydraulic pump drive —
Injection pump control rod
Intake Exhaust Injection camshaft lobe height – LOW 903 .
Intake manifold — Remote air filter
Journal and connecting rod pins diameters.
Main bearings and connecting rod big ends diameters
Oil bath air cleaner ( on request ) „
Oil pan, removal
Oil pump – disassembly —
Oil pump – Reassembly
PISTON .
Piston clearance
Piston coolant nozzles
Piston ring. Clearance between grooves .
Piston ring. mounting order „
Piston rings – End gaps .
Piston,
Piston. class
Piston, disassembly and inspection —
Piston, weight….
Pre-combustion chamber .
Pre-combustion chamber ring nut removal .
Pre.combustion chamber, installation .
Pre-combustion chamber, removal ……….v…v.,.,.,.,
Pumpfinjector unit – Disassembly .
Pump/injector unit – non-return valve.
Rear and lorward main bearing caps ……
RECOMMENDATIONS FOR DISASSEMBLING AND ASSEMBLING
RECOMMENDATIONS FOR OVERHAULS AND TUNING .
Return pulley
Ringfeder-type nogs on LDW 1204-1204/T-1404
rings on LOW 1204-12041%1404 Assembly .
Rocker arm assembly
Rocker arm cover….
Rocker arm cover gasket
Rocker arm pivot, dismounting and remounting .
Shoulder half rings
Shoulder half rings, Oversized elements
Speed governor .
Speed governor – Limiting speed governor
Speed govemor – Reassembly
Speed governor components
Stop pin rings. dismounting and remounting…
Third drive, components
Tightening pulley
Timing belt / Timing pulley arrangement

Timing belt removal .
Vacuum pump and vacuum pump flange
Valve / Rocker arm clearance —
Valve guide insertion
Valve guides and valve guide housings .
Valve recess and seat sealing width
Valve seats and housings Dimensions
Valve springs.
Valve stem sealing rings – Reassembly
Valve timing – Angles
Valve timing check
Valve, specifications –
Valves
TURBOCHARGER
TURBO CHARGER.
Turbocharger components
Turbocharger pressure testing
Turbocharger west gate adjustment – Regolazione corsa asta comando
LUBRIFICATION CIRCUIT
Internal oil filter and oil sump retum pipe
LUBRIFICATION CIRCUIT
Oil filter cartridge
Oil pressure check
Oil pressure regulating valve „
Oil pump
Oil pump, Clearance between rotors —
COOLANT CIRCUIT
COOLANT CIRCUIT .
Coolant circulation pump, components .
Radiator and compensation, check and seal tank Cap..
Thermostatic
FUEL SYSTEM
Closing the oilhole
Fuel feeding I injection circuit
Fuel filter detached from the tank (on request) .
Fuel lift pump
Fuel pump drive rod projection
Injection advance control and regulation
Injection advance for currently used pump/injector unit
Injection advance references on timing belt protector
Injection pump assembly/disassembly
Injection pumps delivery balancing
Injector, nozzle projection
Injector, setting (Old type)
Injector, spark arrester
Instrument connection —
Plunger barrel ring nut assembly/disassembty — ..
Plunger injection pump reassembly .
preliminary steps to pump/injector unit delivery balancing test
Pump/injector unit
Pump/injector unit Seno. 6590.285 control data,
Purnp/injector unit, components
Pumping element

o
1
2
3
Setting Of injector according to current unit ,
Static injection advance regulation .
Static injection advance tuning
TDC (Top Dead Center) references
Test head B assembly
Tester and special coupling for injection advance control (Old-type injection pump) .
ELECTRIC SYSTEM
Alternator battery charger curve 12V 20A
Alternator battery charger curve 12V 30A .
Alternator, Iskra 14V 33A
Alternator. Iskra 14V 33A – Performance Curve
Alternator, Marelli type AA 125 R 14V 45A
Alternator, Marelli type AA 125 R 14V 45A – Performance Curve
Coolant high temperature lamp sensor „
ELECTRIC CONTROL PANEL WITH AUTOMATIC ENGINE STOP
Electric starting layout (12V) with flywheel alternator —
Electric starting layout (12V) with Iskra alternator 14V 33A
Electric starting layout (12V) with Marelli type AA 125 R 14V 45A altemator — —
Flywheel Alternator
Oil pressure switch
Pre-heatlng gbw plug .
Pre-heating glow plug control unit with coolant temperature sensor
STARTER MOTOR – Bosch DW 12V KW
Starter motor, Bosch 12V KW
Starter motor, Bosch DW 12V KIN – Performance
Starter motor, Bosch DW f2V 1,6 KW – Performance Curve
Temperature sensor for control unit .
Voltage regulator ……
SETTINGS.
E.G.R. calibration
Injection pump flow limiter and standard engine torque gearing device
Pump injection delivery standard setting without dynamometric brake .
Pumpfinjector unit delivery setting with braked engine ,
Pump/injector unit timing with speed governor .
Required settings (as most applies) e,
Setting the idle maximum (standard)
Setting the idle minimum
Setting the stop .
SPEED SETTINGS
STORAGE
ENGINE STORAGE (NOT INSTALLED)
PREPARING THE ENGINE FOR OPERATION AFTER PROTECTIVE TREATMENT
PROTECTIVE TREATMENT .
TORQUE SPECIFICATIONS AND USE OF SEALANT
Table Of tightening torques for standard Screws (coarse thread) .
Table of tightening torques for standard screws (fine thread) —
Table of tightening torques for the main components.
SPECIAL TOOLS