Caterpillar

Alfa Marine Spare Parts supplies genuine, OEM-quality, remanufactured, and selected aftermarket Caterpillar marine engine spare parts for fishing vessels, tugboats, passenger ferries, offshore-support vessels, workboats, pilot boats, patrol craft, yachts, cargo ships, dredgers, cruise ships, and marine generator installations.

We support vessel owners, fleet operators, ship-management companies, shipyards, marine workshops, engine rebuilders, and generator specialists with Cat marine components for routine servicing, emergency repairs, scheduled overhauls, and complete engine rebuilding.

Our Caterpillar marine parts range includes:

• Fuel injectors
• Unit injectors
• Common-rail components
• High-pressure fuel pumps
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Oil pumps
• Pistons and cylinder liners
• Cylinder heads
• Main and connecting-rod bearings
• Filters
• Gasket sets
• Sensors
• Electronic control modules
• Starter motors
• Alternators
• Complete overhaul kits

Caterpillar supplies integrated marine power solutions covering commercial propulsion, high-performance propulsion, auxiliary engines, marine generator sets, hybrid and electric systems, vessel controls, digital monitoring, and lifecycle support.

The current published Cat marine range includes:

Commercial Propulsion Engines

• Cat C7.1
• Cat C9.3
• Cat C12
• Cat C18
• Cat C32
• Cat C32B
• Cat 3406C
• Cat 3512C
• Cat 3512E
• Cat 3516C
• Cat 3516E
• Cat 3516E High Output
• Cat C280-6
• Cat C280-8
• Cat C280-12
• Cat C280-16

High-Performance Propulsion Engines

• Cat C7.1
• Cat C12
• Cat C18
• Cat C32
• Cat C32B Twin Turbo
• Cat C32B Sequential Turbo

Marine Generator Sets

• Cat C1.5
• Cat C2.2
• Cat C2.2B
• Cat C4.4
• Cat C4.4 Electronic
• Cat C7.1
• Cat C9.3
• Cat C18
• Cat C32
• Cat 3512C
• Cat C280-6
• Cat C280-8
• Cat C280-12
• Cat C280-16

Marine Auxiliary Engines

• Cat C4.4
• Cat C7.1
• Cat C9.3
• Cat C18
• Cat C32
• Cat C32B
• Cat 3512E
• Cat 3516E
• Cat C280

Caterpillar’s current product selector lists these engine families across commercial propulsion, recreational propulsion, auxiliary, and generator categories.

Caterpillar engine designations generally identify the engine family or approximate displacement.

Examples include:

• Cat C7.1
• Cat C9.3
• Cat C12
• Cat C18
• Cat C32
• Cat 3512
• Cat 3516
• Cat C280-12

Additional letters may identify an engine generation, emissions configuration, fuel system, or performance version.

Examples include:

• C32B – later C32 engine generation
• 3512E – E-generation 12-cylinder 3500 Series
• 3516E – E-generation 16-cylinder 3500 Series
• C32B Twin Turbo – twin-turbo high-performance configuration
• C32B Sequential Turbo – sequential-turbo high-performance configuration

A shortened engine name is not sufficient for accurate parts identification. Customers should provide:

• Complete engine model
• Engine serial number
• Arrangement number
• Existing part number
• Vessel application
• Duty rating
• Emissions configuration

Compact Caterpillar engines are used in marine generator sets, emergency generators, auxiliary systems, pumps, and small vessel applications.

Common models include:

• Cat C1.5
• Cat C2.2
• Cat C2.2B
• Cat C4.4
• Cat C4.4 Electronic

Typical applications include:

• Yacht generator sets
• Emergency generators
• Small fishing-vessel generators
• Harbour generators
• Lighting systems
• Refrigeration systems
• Hydraulic power packs
• Fire pumps
• Deck machinery

Frequently requested parts include:

• Oil filters
• Fuel filters
• Air filters
• Fuel injectors
• Fuel-transfer pumps
• Water pumps
• Thermostats
• Belts
• Starter motors
• Alternators
• Cylinder-head gaskets
• Complete gasket kits
• Cat C1.5 marine generator parts
• Caterpillar C2.2 marine parts
• Cat C2.2B generator parts
• Cat C4.4 marine engine parts
• Cat C4.4 fuel injector
• Cat C4.4 water pump
• Caterpillar C4.4 overhaul kit

The Cat C7.1 is an inline six-cylinder, 7.01-litre turbocharged and aftercooled marine engine.

Commercial propulsion ratings range from approximately 280 to 425 bhp, or 209 to 317 bkW, at speeds between 2,300 and 2,700 rpm. Published emissions configurations include EPA Tier 3, IMO II, RCD II, and China II.

The C7.1 is also available for recreational boating and is marketed for smaller motor yachts and vessels approximately 25 to 60 feet in length.

Typical applications include:

• Motor yachts
• Sportfishing boats
• Patrol craft
• Pilot boats
• Fishing vessels
• Passenger launches
• Workboats
• Marine generator sets
• Auxiliary power units

The electronic auxiliary version is published at approximately 109 to 218 bkW and is offered with common-rail fuel injection, a gear-driven jacket-water pump, and a seawater aftercooler.

Frequently requested C7.1 parts include:

• Common-rail fuel injectors
• High-pressure fuel pumps
• Fuel-pressure sensors
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Thermostats
• Oil coolers
• Fuel coolers
• Starter motors
• Alternators
• Electronic control modules
• Complete service kits
• Caterpillar C7.1 marine parts
• Cat C7.1 fuel injector
• Cat C7.1 high-pressure fuel pump
• Cat C7.1 seawater pump
• Cat C7.1 turbocharger
• Cat C7.1 marine service kit
• Caterpillar C7.1 overhaul kit

Cat C9 Marine Engine

The Caterpillar C9 remains widely installed in yachts, commercial craft, generator sets, and auxiliary applications.

Common searches include:

• Cat C9 marine parts
• Caterpillar C9 fuel injector
• Cat C9 HEUI pump
• Cat C9 turbocharger
• Cat C9 water pump
• Caterpillar C9 overhaul kit

Cat C9.3 Marine Engine

The Cat C9.3 is an inline six-cylinder, electronically controlled common-rail engine.

Commercial propulsion ratings include approximately:

• 375 bhp at 1,800 rpm
• 416 bhp at 2,100 rpm
• 476 bhp at 2,300 rpm

The C9.3 propulsion, auxiliary, and generator versions use a common-rail fuel system. Marine cooling options include heat-exchanger and keel-cooled configurations.

Typical applications include:

• Fishing vessels
• Pilot boats
• Workboats
• Passenger craft
• Patrol vessels
• Tugboats
• Marine generator sets
• Offshore auxiliary systems

Frequently requested C9.3 parts include:

• Common-rail injectors
• High-pressure fuel pumps
• Fuel rails
• Fuel-pressure sensors
• Turbochargers
• Water pumps
• Oil pumps
• Thermostats
• Electronic control modules
• Wiring harnesses
• Piston-and-liner kits
• Complete overhaul kits
• Caterpillar C9.3 marine parts
• Cat C9.3 injector
• Cat C9.3 fuel pump
• Cat C9.3 turbocharger
• Cat C9.3 water pump
• Cat C9.3 overhaul kit

The Caterpillar 3116 and 3126 are widely installed legacy marine engines. They remain common in sportfishing boats, motor yachts, passenger vessels, workboats, and generator packages.

Common models include:

• Cat 3116
• Cat 3116TA
• Cat 3126
• Cat 3126B
• Cat 3126TA

Typical applications include:

• Motor yachts
• Sportfishing boats
• Charter boats
• Passenger launches
• Patrol craft
• Workboats
• Marine generators

Frequently requested parts include:

• Fuel injectors
• Unit injectors
• Injector seals
• Fuel-transfer pumps
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Oil coolers
• Heat-exchanger parts
• Exhaust manifolds
• Cylinder heads
• Pistons and rings
• Complete gasket kits
• Caterpillar 3116 marine parts
• Cat 3116 fuel injector
• Caterpillar 3116 seawater pump
• Cat 3116 turbocharger
• Caterpillar 3126 marine parts
• Cat 3126B injector
• Cat 3126 overhaul kit

The Caterpillar C12 is a six-cylinder marine diesel engine used in commercial vessels, yachts, sportfishing boats, passenger craft, and generator applications.

Published commercial C12 ratings include approximately 340 to 490 bhp, depending on speed and configuration.

High-performance C12 versions have been offered at approximately:

• 570–600 bhp for selected IMO I ratings
• 660–705 bhp for selected IMO II ratings

The C12 uses electronically controlled unit injection in these marine configurations.

Typical applications include:

• Motor yachts
• Sportfishing vessels
• Commercial fishing boats
• Patrol craft
• Passenger boats
• Pilot boats
• Workboats

Frequently requested parts include:

• Electronic unit injectors
• Injector wiring harnesses
• Fuel-transfer pumps
• Turbochargers
• Seawater pumps
• Water pumps
• Oil coolers
• Aftercoolers
• Exhaust manifolds
• Electronic control modules
• Pistons and liners
• Cylinder heads
• Complete overhaul kits
• Caterpillar C12 marine parts
• Cat C12 injector
• Cat C12 turbocharger
• Caterpillar C12 seawater pump
• Cat C12 aftercooler
• Cat C12 cylinder head
• Caterpillar C12 overhaul kit

The Cat C13 has been used in marine propulsion, generator, and auxiliary applications, particularly in commercial craft and selected high-performance installations.

Typical applications include:

• Fishing vessels
• Passenger craft
• Workboats
• Marine generator sets
• Patrol vessels
• Offshore auxiliaries

Popular replacement categories include:

• Fuel injectors
• High-pressure fuel pumps
• Turbochargers
• Water pumps
• Oil pumps
• Sensors
• Electronic control modules
• Pistons and liners
• Cylinder heads
• Gasket kits
• Caterpillar C13 marine parts
• Cat C13 fuel injector
• Cat C13 turbocharger
• Cat C13 water pump
• Caterpillar C13 overhaul kit

The Caterpillar C15 is found in yachts, commercial vessels, workboats, generator sets, and other marine installations.

Typical applications include:

• Fishing vessels
• Motor yachts
• Passenger boats
• Commercial workboats
• Marine generators
• Patrol vessels

Frequently requested parts include:

• Fuel injectors
• Injector seals
• Fuel pumps
• Turbochargers
• Water pumps
• Oil pumps
• Exhaust manifolds
• Sensors
• ECM components
• Pistons and liners
• Cylinder heads
• Complete overhaul kits
• Caterpillar C15 marine parts
• Cat C15 injector
• Cat C15 turbocharger
• Cat C15 seawater pump
• Caterpillar C15 overhaul kit

The Cat C18 is widely used in commercial and high-performance marine propulsion.

The high-performance C18 range includes ratings from approximately 599 to 847 bkW and is available for recreational applications meeting selected EPA Tier 3, IMO II, and EU Stage IIIA regulations.

Typical applications include:

• Motor yachts
• Sportfishing vessels
• Patrol boats
• Pilot boats
• Fast passenger vessels
• Commercial fishing vessels
• Workboats
• Marine generator sets
• Auxiliary installations

Frequently requested parts include:

• Fuel injectors
• High-pressure fuel pumps
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Aftercoolers
• Oil coolers
• Heat exchangers
• Exhaust manifolds
• Sensors
• ECM units
• Pistons and liners
• Cylinder heads
• Overhaul kits
• Caterpillar C18 marine parts
• Cat C18 fuel injector
• Cat C18 high-pressure pump
• Caterpillar C18 seawater pump
• Cat C18 turbocharger
• Cat C18 aftercooler
• Caterpillar C18 overhaul kit

The Caterpillar C27 is a V12 diesel engine used in commercial marine, yacht, generator, and auxiliary installations.

Typical applications include:

• Motor yachts
• Passenger vessels
• Fishing boats
• Patrol craft
• Marine generators
• Offshore-support equipment

Frequently requested parts include:

• Fuel injectors
• Turbochargers
• Water pumps
• Oil pumps
• Aftercooler components
• Cylinder heads
• Pistons and liners
• Bearing sets
• Gasket kits
• Electronic sensors
• Caterpillar C27 marine parts
• Cat C27 injector
• Cat C27 turbocharger
• Caterpillar C27 water pump
• Cat C27 overhaul kit

The Caterpillar C32 is one of the best-known Cat marine engines for commercial vessels, yachts, sportfishing boats, patrol craft, and generator installations.

The current commercial propulsion range includes ratings meeting selected:

• EPA Tier 3
• EPA Tier 4
• IMO II
• IMO III
• EU Stage V

The C32 is offered with separate-circuit aftercooling for selected ratings and seawater aftercooling for other duty configurations.

Auxiliary and generator configurations are also available with IMO II, IMO III, EPA Tier 4, EU Stage V, and China II ratings, depending on specification. Heat-exchanger and keel-cooled options are published.

Typical applications include:

• Superyachts
• Sportfishing boats
• Patrol craft
• Fast ferries
• Pilot boats
• Workboats
• Fishing vessels
• Offshore crew-transfer vessels
• Marine generator sets

Frequently requested C32 parts include:

• Common-rail injectors
• High-pressure fuel pumps
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Charge-air cooler components
• Oil coolers
• Fuel coolers
• Electronic control modules
• Sensors
• Pistons and liners
• Cylinder heads
• Bearing sets
• Complete overhaul kits
• Caterpillar C32 marine parts
• Cat C32 injector
• Cat C32 fuel pump
• Caterpillar C32 seawater pump
• Cat C32 turbocharger
• Cat C32 aftercooler
• Caterpillar C32 overhaul kit

The Cat C32B is a later-generation V12 marine engine available for commercial and high-performance propulsion.

Versions include:

• Cat C32B commercial propulsion
• Cat C32B auxiliary
• Cat C32B Twin Turbo
• Cat C32B Sequential Turbo

Typical applications include:

• Large motor yachts
• Sportfishing vessels
• Fast patrol craft
• Passenger vessels
• Commercial workboats
• Marine generators
• Offshore vessels

Frequently requested parts include:

• Common-rail injectors
• High-pressure fuel pumps
• Twin-turbo components
• Sequential-turbo components
• Seawater pumps
• Sensors
• Electronic control modules
• Cooling-system parts
• Gaskets and seals
• Caterpillar C32B marine parts
• Cat C32B fuel injector
• Cat C32B turbocharger
• Cat C32B Twin Turbo parts
• Cat C32B Sequential Turbo parts
• Caterpillar C32B overhaul kit

The Caterpillar 3208 is one of the most widely recognized legacy Cat marine diesel engines.

Common versions include:

• Cat 3208 naturally aspirated
• Cat 3208T
• Cat 3208TA
• Cat 3208 Marine

Typical applications include:

• Fishing vessels
• Motor yachts
• Passenger boats
• Patrol craft
• Workboats
• Marine generator sets

Frequently requested Cat 3208 parts include:

• Fuel injectors
• Injector nozzles
• Fuel-injection pumps
• Turbochargers
• Seawater pumps
• Water pumps
• Oil pumps
• Exhaust manifolds
• Pistons and rings
• Cylinder heads
• Main bearings
• Connecting-rod bearings
• Complete gasket kits
• Caterpillar 3208 marine parts
• Cat 3208 injector
• Caterpillar 3208 injection pump
• Cat 3208 seawater pump
• Cat 3208 turbocharger
• Caterpillar 3208 overhaul kit

The Cat 3304 and 3306 are durable legacy engines used in workboats, fishing vessels, generators, pumps, and auxiliary installations.

Common models include:

• Cat 3304
• Cat 3304T
• Cat 3306
• Cat 3306B
• Cat 3306TA

Typical applications include:

• Fishing vessels
• Workboats
• Barges
• Harbour vessels
• Marine generators
• Pumps
• Deck machinery

Frequently requested parts include:

• Fuel injectors
• Injection pumps
• Turbochargers
• Water pumps
• Oil pumps
• Pistons and liners
• Cylinder heads
• Bearing sets
• Gasket kits
• Overhaul components
• Caterpillar 3304 marine parts
• Cat 3304 injector
• Caterpillar 3306 marine parts
• Cat 3306 fuel pump
• Cat 3306 water pump
• Caterpillar 3306 overhaul kit

The Caterpillar 3406 is another major legacy marine engine family.

Common models include:

• Cat 3406
• Cat 3406B
• Cat 3406C
• Cat 3406E
• Cat 3406 Marine

The 3406C remains listed in Caterpillar’s current commercial marine propulsion range.

Typical applications include:

• Tugboats
• Fishing vessels
• Workboats
• Passenger craft
• Cargo vessels
• Marine generator sets

Frequently requested parts include:

• Fuel injectors
• Injection pumps
• Turbochargers
• Seawater pumps
• Jacket-water pumps
• Oil coolers
• Exhaust manifolds
• Pistons and liners
• Cylinder heads
• Main bearings
• Connecting-rod bearings
• Complete overhaul kits
• Caterpillar 3406 marine parts
• Cat 3406C injector
• Caterpillar 3406 fuel pump
• Cat 3406 turbocharger
• Cat 3406 seawater pump
• Caterpillar 3406 overhaul kit

The Caterpillar 3412 is a V12 engine widely used in commercial vessels, yachts, offshore equipment, and generator sets.

Common models include:

• Cat 3412
• Cat 3412C
• Cat 3412D
• Cat 3412E
• Cat 3412TA

Typical applications include:

• Tugboats
• Fishing vessels
• Motor yachts
• Passenger vessels
• Workboats
• Offshore-support craft
• Marine generator sets

Frequently requested parts include:

• Fuel injectors
• Unit injectors
• Fuel pumps
• Turbochargers
• Water pumps
• Oil pumps
• Aftercooler components
• Cylinder heads
• Pistons and liners
• Bearings
• Complete overhaul kits
• Caterpillar 3412 marine parts
• Cat 3412 injector
• Caterpillar 3412 turbocharger
• Cat 3412 water pump
• Cat 3412 cylinder head
• Caterpillar 3412 overhaul kit

The Cat 3508 is an eight-cylinder V-engine used in propulsion, auxiliary, and generator applications.

Common versions include:

• Cat 3508
• Cat 3508B
• Cat 3508C
• Cat 3508 Marine

Typical applications include:

• Tugboats
• Offshore vessels
• Fishing vessels
• Dredgers
• Passenger vessels
• Marine generators
• Diesel-electric systems

Frequently requested parts include:

• Fuel injectors
• Fuel pumps
• Turbochargers
• Cylinder heads
• Pistons and liners
• Connecting rods
• Bearings
• Water pumps
• Oil pumps
• Gasket sets
• Overhaul components
• Caterpillar 3508 marine parts
• Cat 3508 injector
• Caterpillar 3508 turbocharger
• Cat 3508 cylinder head
• Caterpillar 3508 overhaul kit

The Cat 3512 is a V12 heavy-duty engine used for propulsion, auxiliary power, generator sets, and diesel-electric installations.

Common versions include:

• Cat 3512
• Cat 3512B
• Cat 3512C
• Cat 3512E

The current 3512E propulsion range includes configurations meeting selected EPA Tier 4 Final and IMO III marine emissions requirements.

The 3512E is also available as an auxiliary engine meeting selected EPA Tier 4 Final and IMO III requirements.

Typical applications include:

• Tugboats
• Offshore-support vessels
• Ferries
• Cargo vessels
• Dredgers
• Fishing vessels
• Cruise-ship generators
• Diesel-electric vessels
• Hybrid vessels

Frequently requested parts include:

• Fuel injectors
• High-pressure fuel pumps
• Turbochargers
• Cylinder heads
• Pistons and liners
• Connecting rods
• Main bearings
• Water pumps
• Oil pumps
• Aftercooler components
• Sensors
• Electronic control modules
• Complete overhaul kits
• Caterpillar 3512 marine parts
• Cat 3512B injector
• Caterpillar 3512C spare parts
• Cat 3512E fuel injector
• Cat 3512E turbocharger
• Caterpillar 3512 overhaul kit

The Cat 3516 is a V16 marine engine for high-output propulsion, auxiliary, and generator applications.

Common versions include:

• Cat 3516
• Cat 3516B
• Cat 3516C
• Cat 3516E
• Cat 3516E High Output

The current 3516E propulsion range includes ratings that meet selected EPA Tier 4, IMO II, and IMO III marine requirements.

Typical applications include:

• Tugboats
• Offshore-support vessels
• Ferries
• Dredgers
• Cargo vessels
• Cruise ships
• Naval vessels
• Large generator sets
• Diesel-electric propulsion systems

Frequently requested parts include:

• Fuel injectors
• High-pressure fuel pumps
• Turbochargers
• Cylinder heads
• Pistons and liners
• Connecting rods
• Bearings
• Water pumps
• Oil pumps
• Charge-air cooler components
• Sensors
• ECM modules
• Complete overhaul kits
• Caterpillar 3516 marine parts
• Cat 3516B spare parts
• Caterpillar 3516C injector
• Cat 3516E marine parts
• Cat 3516E turbocharger
• Caterpillar 3516 overhaul kit

The Caterpillar 3600 Series includes large-displacement heavy-duty marine and power-generation engines.

Common models include:

• Cat 3606
• Cat 3608
• Cat 3612
• Cat 3616

Typical applications include:

• Offshore vessels
• Dredgers
• Large tugboats
• Cruise ships
• Cargo vessels
• Diesel-electric propulsion
• Marine generator sets
• Stationary power systems

Frequently requested parts include:

• Fuel injectors
• Fuel-pump elements
• Cylinder heads
• Exhaust valves
• Pistons
• Cylinder liners
• Connecting rods
• Main bearings
• Turbocharger components
• Water pumps
• Oil pumps
• Control-system components
• Caterpillar 3606 marine parts
• Cat 3608 engine parts
• Caterpillar 3612 spare parts
• Cat 3616 fuel injector
• Caterpillar 3600 overhaul parts

The Caterpillar C280 is a large medium-speed marine engine platform.

Current configurations include:

• Cat C280-6
• Cat C280-8
• Cat C280-12
• Cat C280-16

These engines are available across commercial propulsion, auxiliary, and generator applications in Caterpillar’s current marine portfolio.

Typical applications include:

• Cruise ships
• Offshore-support vessels
• Naval vessels
• Ferries
• Cargo vessels
• Dredgers
• Diesel-electric propulsion
• Large generator installations

Frequently requested parts include:

• Fuel injectors
• Common-rail components
• Fuel pumps
• Cylinder heads
• Exhaust valves
• Pistons and liners
• Connecting rods
• Main bearings
• Turbocharger parts
• Cooling-water pumps
• Lubrication-system components
• Automation parts
• Caterpillar C280 marine parts
• Cat C280-6 spare parts
• Cat C280-8 fuel injector
• Caterpillar C280-12 cylinder head
• Cat C280-16 overhaul parts
• Caterpillar C280 generator parts

Caterpillar also supports the MaK medium-speed engine brand, which is widely used in commercial shipping, cruise vessels, ferries, offshore vessels, cargo ships, and marine generator applications.

Common MaK engine families include:

• MaK M 20
• MaK M 25
• MaK M 25 E
• MaK M 32
• MaK M 32 C
• MaK M 32 E
• MaK M 34 DF
• MaK M 43
• MaK M 43 C
• MaK M 46 DF
• MaK M 46 C

The MaK M 32 E was developed as a higher-output successor based on the M 32 C footprint and is described as a 5 MW engine in the 320 mm bore segment.

The MaK M 34 DF is a dual-fuel engine with published outputs of approximately 3,060 to 4,770 bkW at 720 or 750 rpm.

MaK dual-fuel technology is used in commercial and cruise applications, including LNG-fuelled propulsion.

Frequently requested MaK parts include:

• Fuel injectors
• Pilot-fuel injectors
• Gas-admission components
• Fuel-pump elements
• Cylinder heads
• Exhaust valves
• Pistons and liners
• Connecting rods
• Bearings
• Turbocharger components
• Water pumps
• Oil pumps
• Control-system parts
• MaK marine engine parts
• MaK M20 spare parts
• MaK M25 engine parts
• MaK M32C fuel injector
• MaK M32E cylinder head
• MaK M34DF dual-fuel parts
• MaK M43C overhaul parts
• Caterpillar MaK marine parts

Caterpillar marine generator sets support:

• Main shipboard electrical generation
• Emergency power
• Hotel loads
• Navigation systems
• Refrigeration
• Dynamic positioning
• Pumps
• Cranes
• Deck machinery
• Diesel-electric propulsion
• Hybrid propulsion

Current generator engine families include:

• C1.5
• C2.2
• C2.2B
• C4.4
• C7.1
• C9.3
• C18
• C32
• 3512C
• C280 Series

Marine generator suitability depends on:

• Required frequency
• Electrical output
• Cooling arrangement
• Emissions standard
• Classification requirements
• Continuous or standby rating

Routine Maintenance Parts

• Engine oil filters
• Primary fuel filters
• Secondary fuel filters
• Air filters
• Fuel-water separators
• Crankcase breather filters
• Transmission filters
• Belts
• Thermostats
• Zinc anodes
• Service kits
• Hose kits
• O-ring kits

Fuel-System Parts

• Mechanical fuel injectors
• Electronic unit injectors
• HEUI injectors
• Common-rail injectors
• Injector nozzles
• Injector sleeves
• Injector seals
• Fuel-injection pumps
• High-pressure fuel pumps
• HEUI pumps
• Fuel-transfer pumps
• Fuel-priming pumps
• Fuel rails
• Fuel-pressure regulators
• Fuel-pressure sensors
• Fuel lines
• Fuel-control valves

Cooling-System Parts

• Seawater pumps
• Raw-water pumps
• Jacket-water pumps
• Auxiliary water pumps
• Water-pump repair kits
• Impellers
• Thermostats
• Thermostat housings
• Heat exchangers
• Aftercoolers
• Charge-air coolers
• Oil coolers
• Fuel coolers
• Expansion tanks
• Cooling-water pipes
• End caps
• Seals
• O-rings

Engine Overhaul Parts

• Complete overhaul kits
• In-frame overhaul kits
• Pistons
• Piston pins
• Piston-ring sets
• Cylinder liners
• Liner seals
• Connecting rods
• Connecting-rod bushes
• Crankshafts
• Camshafts
• Main bearings
• Connecting-rod bearings
• Thrust bearings
• Tappets
• Timing gears
• Complete gasket sets

Cylinder-Head and Valve Parts

• Complete cylinder heads
• Bare cylinder heads
• Cylinder-head gaskets
• Intake valves
• Exhaust valves
• Valve guides
• Valve seats
• Valve springs
• Rocker arms
• Rocker shafts
• Pushrods
• Injector sleeves
• Valve-cover gaskets

Turbocharger and Air-System Parts

• Complete turbochargers
• Turbocharger cartridges
• Turbo repair kits
• Compressor wheels
• Turbine wheels
• Wastegate actuators
• Twin-turbo components
• Sequential-turbo components
• Intake manifolds
• Exhaust manifolds
• Air filters
• Aftercoolers
• Turbo oil pipes
• Turbo mounting gaskets

Lubrication-System Parts

• Engine oil pumps
• Pre-lubrication pumps
• Oil filters
• Oil-filter housings
• Oil coolers
• Oil-pressure regulators
• Oil-pressure switches
• Oil-pressure sensors
• Oil pans
• Dipsticks
• Lubrication pipes
• Front crankshaft seals
• Rear crankshaft seals

Electrical and Electronic Parts

• Starter motors
• Alternators
• Electronic control modules
• Engine control units
• Wiring harnesses
• Marine power displays
• Vessel control components
• Temperature sensors
• Oil-pressure sensors
• Fuel-pressure sensors
• Boost-pressure sensors
• Speed sensors
• Crankshaft sensors
• Camshaft sensors
• Solenoids
• Relays

Exhaust and Emissions Parts

• Exhaust manifolds
• Wet exhaust elbows
• Dry exhaust elbows
• Exhaust risers
• Flexible exhaust connections
• Exhaust gaskets
• Diesel particulate filters
• Selective catalytic reduction components
• DEF dosing components
• NOx sensors
• Exhaust-temperature sensors
• Catalyst elements
• Mounting clamps

Marine Transmission and Mounting Parts

• Engine mounts
• Flexible couplings
• Damper plates
• Flywheels
• Flywheel housings
• Bell housings
• Gearbox adaptor plates
• Transmission oil coolers
• Control cables
• Mounting brackets

Frequently requested Caterpillar marine products include:

• Cat oil filters
• Cat fuel filters
• Cat air filters
• Cat fuel-water separators
• Caterpillar fuel injectors
• Cat injector nozzles
• Cat high-pressure fuel pumps
• Cat HEUI pumps
• Caterpillar seawater pumps
• Cat jacket-water pumps
• Cat thermostats
• Cat turbochargers
• Cat starter motors
• Cat alternators
• Cat sensors
• Cat ECM modules
• Cat cylinder-head gaskets
• Caterpillar piston-and-liner kits
• Cat bearing sets
• Cat complete gasket kits
• Caterpillar overhaul kits

Caterpillar marine engines are commonly used in:

• Commercial fishing vessels
• Sportfishing boats
• Motor yachts
• Superyachts
• Tugboats
• Push boats
• Passenger ferries
• Cruise ships
• Pilot boats
• Patrol craft
• Fireboats
• Workboats
• Crew-transfer vessels
• Offshore-support vessels
• Platform-supply vessels
• Cargo vessels
• Dredgers
• Research vessels
• Naval vessels
• Marine generator sets
• Diesel-electric vessels
• Hybrid vessels

Alfa Marine Spare Parts supplies Caterpillar marine engine components to customers operating near major shipyards, ports, marinas, repair facilities, and commercial marine centres worldwide.

The companies below are included for geographic and industry relevance only. Their inclusion does not imply that Alfa Marine Spare Parts is affiliated with, authorized by, or an official supplier to these organizations.

United States

Major American shipyards and repair facilities include:

• Huntington Ingalls Industries
• Newport News Shipbuilding
• Ingalls Shipbuilding
• General Dynamics NASSCO
• General Dynamics Bath Iron Works
• Fincantieri Marinette Marine
• Austal USA
• Bollinger Shipyards
• Eastern Shipbuilding Group
• Vigor Marine
• Conrad Shipyard
• Gulf Copper
• BAE Systems Jacksonville Ship Repair
• Hanwha Philly Shipyard

Important Caterpillar marine-service regions include:

• Florida
• Louisiana
• Texas
• California
• Washington
• Virginia
• Maine
• Massachusetts
• Alaska
• Gulf of Mexico

Canada

Major Canadian shipbuilding and repair centres include:

• Seaspan Shipyards
• Irving Shipbuilding
• Davie Shipbuilding
• Heddle Shipyards
• Vancouver Shipyards
• Victoria Shipyards
• Halifax Shipyard

Important Canadian maritime regions include:

• Vancouver
• Victoria
• Halifax
• Québec
• Newfoundland
• Ontario
• Great Lakes
• Atlantic Canada

United Kingdom

Major UK shipyards and repair centres include:

• Navantia UK
• Cammell Laird
• A&P Falmouth
• A&P Tyne
• A&P Tees
• Babcock Rosyth
• Ferguson Marine
• BAE Systems Maritime
• Pendennis Shipyard

Important UK maritime regions include:

• Southampton
• Portsmouth
• Plymouth
• Falmouth
• Liverpool
• Newcastle
• Aberdeen
• Glasgow
• Belfast

Dubai and the United Arab Emirates

Major UAE shipyards and marine-service centres include:

• Drydocks World Dubai
• Dubai Maritime City
• Grandweld Shipyards
• Albwardy Damen
• Gulf Craft
• Al Seer Marine
• Premier Marine Engineering Services

Important UAE maritime hubs include:

• Jebel Ali
• Port Rashid
• Dubai Harbour
• Abu Dhabi
• Sharjah
• Ras Al Khaimah
• Fujairah

Brazil

Major Brazilian shipbuilding and repair centres include:

• Estaleiro Atlântico Sul
• BrasFELS
• Wilson Sons Shipyards
• Estaleiro Rio Grande
• Mauá Shipyard
• Enseada Shipyard
• INACE
• Marina Verolme

Important Brazilian maritime regions include:

• Rio de Janeiro
• Niterói
• Santos
• Itajaí
• Angra dos Reis
• Recife
• Salvador
• Fortaleza

Netherlands

Major Dutch shipyards and repair facilities include:

• Damen Shipyards
• Damen Shiprepair Rotterdam
• Royal IHC
• Royal Niestern Sander
• Holland Shipyards Group
• De Haas Shipyards
• Feadship service facilities

Important Dutch maritime centres include:

• Rotterdam
• Amsterdam
• IJmuiden
• Vlissingen
• Dordrecht
• Harlingen
• Den Helder

Germany

Major German shipyards include:

• Meyer Werft
• Lürssen
• German Naval Yards
• Fassmer
• Abeking & Rasmussen
• Blohm+Voss
• Lloyd Werft

France

Major French shipyards include:

• Chantiers de l’Atlantique
• Naval Group
• Piriou
• OCEA
• Chantier Naval de Marseille
• La Ciotat Shipyards

Italy

Major Italian shipyards and yacht-service centres include:

• Fincantieri
• Sanlorenzo
• Benetti
• Palumbo Superyachts
• CRN
• Rosetti Marino
• Lusben

Spain

Major Spanish shipyards include:

• Navantia
• Astilleros Armón
• Astilleros Gondán
• Freire Shipyard
• Aresa Shipyard
• Metalships & Docks
• MB92 Barcelona

Norway

Major Norwegian shipyards include:

• Vard
• Ulstein Verft
• Myklebust Verft
• Green Yard Kleven
• Larsnes Mek Verksted

Greece

Major Greek shipyards and repair areas include:

• Elefsis Shipyards
• ONEX Neorion Shipyards
• Chalkis Shipyards
• Perama repair zone
• Spanopoulos Group

Singapore

Major Singapore marine and offshore facilities include:

• Seatrium
• PaxOcean
• Strategic Marine
• Penguin Shipyard
• ST Engineering Marine

Important Singapore maritime regions include:

• Tuas
• Jurong
• Sembawang
• Keppel Harbour

United States

• Lauderdale Marine Center
• Bahia Mar Yachting Center
• Rybovich Marina
• Newport Shipyard
• Derecktor Fort Pierce
• Safe Harbor marina network
• San Diego yacht-service facilities

United Kingdom

• Ocean Village Marina
• Hamble Point Marina
• Port Solent Marina
• Premier Brighton Marina
• Queen Anne’s Battery
• Pendennis Marina

Dubai and the UAE

• Dubai Harbour
• Dubai Marina Yacht Club
• Port Rashid Marina
• Yas Marina
• Emirates Palace Marina
• Al Hamra Marina

Brazil

• Marina da Glória
• Marina Verolme
• Marina Itajaí
• BR Marinas
• Iate Clube de Santos
• Marina Piratas

Europe

• Marina Port Vell
• Port Adriano
• Puerto Banús
• Marina Ibiza
• Port Vauban
• Port de Saint-Tropez
• Marina Genova
• Porto Cervo Marina
• Flisvos Marina
• Alimos Marina
• ACI Marina Split
• ACI Marina Dubrovnik
• Porto Montenegro
• Marina Portorož

Cat 3500E Methanol Dual-Fuel Engines

Caterpillar is developing methanol dual-fuel capability for selected 3500E marine engines.

The company has stated that existing 3500E engines can be modified for dual-fuel operation using methanol. Caterpillar reports that a harbour tug could potentially achieve methanol substitution above 70% on an energy basis, depending on the operating profile.

First Field Demonstrator Engines Planned for 2026

Caterpillar and Damen Shipyards announced plans to deploy the first field-demonstrator 3500E methanol dual-fuel marine engines in 2026.

SAAM Towage Methanol Project

Caterpillar and SAAM Towage signed an agreement to evaluate alternative propulsion solutions, including electrification, methanol, and ethanol.

The first SAAM tug powered by Cat 3500E dual-fuel methanol engines was anticipated to begin operation during 2026.

Svitzer Dual-Fuel Collaboration

Caterpillar Marine and Svitzer have also been collaborating on methanol dual-fuel solutions for newbuild and existing tugboats.

Hybrid Offshore Vessels

Caterpillar marine engines are increasingly being integrated with batteries and hybrid power systems.

One recent offshore-wind vessel programme uses a Cat 3512E engine in a battery-hybrid commissioning service operation vessel, while crew-transfer vessels in the same fleet use twin Cat C32 engines.

EU Stage V Marine Solutions

Caterpillar offers certified EU Stage V marine solutions for selected engines using integrated diesel particulate filter and selective catalytic reduction technology. Caterpillar states that the engine and aftertreatment package is designed to operate as one automated system.

Alfa Marine Spare Parts exports Caterpillar marine engine components to customers in:

• United States
• Canada
• United Kingdom
• Ireland
• Netherlands
• Belgium
• Germany
• France
• Spain
• Portugal
• Italy
• Greece
• Croatia
• Norway
• Denmark
• Finland
• Poland
• Turkey
• United Arab Emirates
• Saudi Arabia
• Qatar
• Oman
• Brazil
• Guyana
• Suriname
• Caribbean
• Singapore
• Malaysia
• Indonesia
• Philippines
• South Korea
• Japan
• Australia
• New Zealand
• South Africa
• Nigeria
• Ghana
• Angola

Customers choose Alfa Marine Spare Parts for:

• Genuine Caterpillar marine engine parts
• OEM-quality replacement components
• Selected aftermarket alternatives
• Remanufactured engine components
• Support for current and legacy Cat engines
• Caterpillar MaK engine parts
• Marine propulsion components
• Auxiliary and generator-engine parts
• Technical parts identification
• Assistance with superseded part numbers
• Worldwide export experience
• Competitive quotations
• Fast delivery to ports and shipyards
• Routine maintenance products
• Complete overhaul components

Caterpillar engines are manufactured in numerous versions for marine propulsion, generator sets, construction equipment, mining machinery, industrial systems, locomotives, and stationary power generation.

Two engines with the same basic model number may use different components because of:

• Engine serial-number prefix
• Complete serial number
• Arrangement number
• Duty rating
• Power rating
• Rated speed
• Mechanical, HEUI, unit-injection, or common-rail fuel system
• Turbocharger configuration
• Emissions specification
• Heat-exchanger or keel-cooled installation
• Propulsion or generator application
• Marine gearbox
• Regional specification

Before ordering, customers should provide:

• Complete Caterpillar engine model
• Engine serial number
• Serial-number prefix
• Arrangement number
• Existing Cat part number
• Engine data-plate photograph
• Propulsion, auxiliary, or generator application
• Duty rating
• Rated speed
• Cooling-system configuration
• Turbocharger model
• Marine gearbox or generator model
• Photographs of the existing component
• Required quantity
• Delivery destination

Looking for Caterpillar 3116, 3126, 3208, 3306, 3406, 3412, C7.1, C9, C9.3, C12, C15, C18, C27, C32, 3508, 3512, 3516, 3600, C280, or MaK engine parts?

Send Alfa Marine Spare Parts your:

• Complete engine model
• Engine serial number
• Arrangement number
• Required part numbers
• Product descriptions
• Vessel or generator application
• Quantities
• Photographs
• Delivery country and port

We supply genuine, OEM-quality, remanufactured, and selected aftermarket Caterpillar marine components for routine servicing, emergency repairs, propulsion engines, marine generators, auxiliary systems, and complete engine overhauls.

Alfa Marine Spare Parts – Your Worldwide Supplier of Caterpillar Marine Engine Spare Parts.

Do you supply Caterpillar marine engine parts?

Yes. Alfa Marine Spare Parts supplies genuine, OEM-quality, remanufactured, and selected aftermarket components for Caterpillar marine propulsion, auxiliary, generator, and high-performance engines.

Which Caterpillar marine engines do you support?

We supply selected components for engine families including:

• Caterpillar 3116
• Caterpillar 3126
• Caterpillar 3208
• Caterpillar 3304
• Caterpillar 3306
• Caterpillar 3406
• Caterpillar 3412
• Caterpillar C7.1
• Caterpillar C9
• Caterpillar C9.3
• Caterpillar C12
• Caterpillar C13
• Caterpillar C15
• Caterpillar C18
• Caterpillar C27
• Caterpillar C32
• Caterpillar C32B
• Caterpillar 3508
• Caterpillar 3512
• Caterpillar 3516
• Caterpillar 3600 Series
• Caterpillar C280
• Selected MaK engines

Availability depends on the exact engine model, serial number, arrangement number, and required component.

Do you supply Cat C32 marine engine parts?

Yes. We can source selected common-rail injectors, fuel pumps, turbochargers, seawater pumps, water pumps, cooling parts, sensors, pistons, liners, cylinder heads, bearings, gasket sets, and overhaul components for Cat C32 engines.

Do you supply Caterpillar 3512 and 3516 parts?

Yes. We supply selected fuel-system, turbocharger, cooling-system, cylinder-head, piston, liner, bearing, sensor, gasket, and overhaul parts for 3512 and 3516 engine families.

Do you supply Caterpillar MaK marine parts?

Yes. We can source selected parts for MaK engines including the M20, M25, M32, M32C, M32E, M34DF, M43, and M46 families.

Can you identify Cat parts using the engine serial number?

Yes. Customers should provide the complete engine model, serial-number prefix, complete serial number, arrangement number, existing part number, and clear photographs.

Do you supply parts for older Caterpillar marine engines?

Yes. We support many legacy engines including the 3116, 3126, 3208, 3306, 3406, 3412, 3508, 3512, and 3516 families.

Do you ship Caterpillar marine parts worldwide?

Yes. We arrange international delivery to shipowners, fishing fleets, yacht operators, shipyards, offshore companies, marine workshops, and generator specialists worldwide.

Can you supply complete Caterpillar overhaul kits?

Depending on the engine model and serial-number range, we can source complete overhaul kits, in-frame kits, piston-and-liner kits, bearing sets, cylinder-head components, gasket sets, fuel-system parts, and related rebuild components.