Caterpillar C12.9 Marine Engine Spare Parts
The Caterpillar C12.9 marine engine is a high-performance six-cylinder diesel engine used in yachts, commercial vessels and other marine propulsion applications. Alfa Marine Spare Parts supplies CAT C12.9 engine spare parts for scheduled maintenance, repairs and engine overhaul requirements.
We source genuine, OEM, aftermarket and applicable remanufactured components for Caterpillar C12.9 engines. To identify the correct replacement part, provide the engine serial number, arrangement information and existing part number whenever available.
Caterpillar C12.9 Marine Engine
The Caterpillar C12.9 is an inline six-cylinder, four-stroke diesel engine with approximately 12.9 litres displacement. It was developed for marine applications requiring high power from a relatively compact engine package.
Different C12.9 ratings and configurations can use different components, making accurate engine identification important before ordering replacement parts.
C12.9 engines can be found in applications including:
- Motor yachts
- Sportfishing vessels
- Pleasure craft
- Commercial vessels
- Fast craft
- Passenger vessels
- Other high-performance marine applications
CAT C12.9 Engine Spare Parts
Alfa Marine Spare Parts can source replacement components across the major Caterpillar C12.9 engine systems.
Whether you require a single sensor or components for a larger engine repair, send us the existing part number or engine information for identification.
Caterpillar C12.9 Fuel Injectors & Fuel System
Fuel-system components can include:
- Fuel injectors
- Injector seals
- Fuel pumps
- Fuel transfer pumps
- Fuel filters
- Fuel lines
- Fuel-pressure components
- Fuel-system sensors
- O-rings and seals
Injector references can vary according to the C12.9 engine configuration. We recommend verifying the required injector against the engine serial number before ordering.
CAT C12.9 Turbochargers & Air System
Turbocharging and air-system components can include:
- Turbochargers
- Remanufactured turbochargers where applicable
- Turbocharger cartridges and related components
- Air-intake components
- Aftercooler components
- Intake manifolds
- Exhaust manifolds
- Turbocharger gaskets
- Seals and mounting components
If you have an existing turbocharger part number, include it with your enquiry.
Caterpillar C12.9 Cooling System Parts
Marine engines depend heavily on an efficient cooling system, particularly when operating continuously at higher loads.
We can assist with C12.9 cooling-system components including:
- Sea water pumps
- Fresh-water pumps
- Auxiliary water pumps
- Water-pump repair components
- Impellers
- Thermostats
- Heat exchangers
- Aftercoolers
- Oil coolers
- Cooling-system hoses
- Gaskets
- O-rings and seals
When the water-pump part number is unknown, send photographs of the existing pump together with the C12.9 engine serial number.
Lubrication System Components
Available C12.9 lubrication-system parts can include:
- Oil pumps
- Oil filters
- Oil coolers
- Oil-pressure components
- Oil lines
- Gaskets
- O-rings
- Seals
Correct oil-system components should be checked against the specific engine configuration.
Caterpillar C12.9 Internal Engine Parts
For internal engine repairs and major maintenance, Alfa Marine Spare Parts can assist with components including:
- Cylinder heads
- Pistons
- Piston rings
- Cylinder liners
- Connecting rods
- Main bearings
- Connecting-rod bearings
- Crankshaft components
- Camshaft components
- Intake valves
- Exhaust valves
- Valve guides
- Rocker components
- Gaskets and seals
CAT C12.9 Overhaul Parts
A major C12.9 repair or overhaul can involve components from several engine systems.
Depending on the engine configuration and required scope of work, we can source:
- Pistons
- Piston rings
- Cylinder liners
- Main bearings
- Connecting-rod bearings
- Cylinder-head components
- Valves and valve components
- Gasket sets
- Seal kits
- Fuel injectors
- Turbochargers
- Water pumps
- Oil pumps
- Filters and maintenance components
Instead of assuming that one overhaul kit fits every C12.9, send us the complete engine details so the required components can be checked individually.
Sensors, Electrical & Electronic Components
Modern Caterpillar C12.9 engines use electronic monitoring and control systems throughout the engine.
Replacement requirements can include:
- Pressure sensors
- Temperature sensors
- Speed sensors
- Engine sensors
- Wiring harnesses
- Electronic control components
- ECM-related components
- Starters
- Alternators
- Switches
- Displays
- Monitoring components
For electronic parts, the existing part number and engine serial number are particularly important.
Genuine, OEM, Aftermarket & Remanufactured C12.9 Parts
Depending on the component and availability, Alfa Marine Spare Parts can offer different replacement options.
Genuine Caterpillar – original Caterpillar-branded replacement components.
OEM – components sourced through original-equipment manufacturing channels where available.
Aftermarket – selected replacement alternatives for suitable C12.9 applications.
Remanufactured – professionally remanufactured components where an applicable reman option exists.
If you have a preference, specify genuine, OEM, aftermarket or remanufactured when requesting your quotation.
How to Find the Correct CAT C12.9 Part Number
The engine model alone is not always enough to determine the correct component.
For accurate parts identification, send us:
- Engine model: C12.9
- Engine serial number
- Serial-number prefix
- Arrangement number, where available
- Existing Caterpillar part number
- Part description
- Required quantity
- Photograph of the existing component
- Photograph of the engine identification plate
- Vessel location
- Delivery destination
If you only have an older part number, send it with your enquiry. We can check the supplied information when sourcing the replacement.
Related Caterpillar C-Series Engine Pages
Looking for components for another Caterpillar engine? Browse our related engine pages:
Caterpillar C12 Marine Engine Parts
Caterpillar C15 Marine Engine Parts
Caterpillar C18 Marine Engine Parts
Caterpillar C27 Marine Engine Parts
Caterpillar C30 Marine Engine Parts
Caterpillar C32 Marine Engine Parts
CAT Marine Engine Parts & Rebuild Kits
Caterpillar Engines & Spare Parts
Browse Marine Spare Parts
You can also browse our marine spare-parts catalogue for individual engine components and replacement parts.
Categories include:
- Fuel injectors
- Fuel-system components
- Turbochargers
- Water pumps
- Oil pumps
- Cooling-system parts
- Heat exchangers
- Cylinder heads
- Pistons and liners
- Bearings
- Gaskets and seals
- Sensors
- Electrical components
- Engine-control components
- Maintenance and overhaul parts
Worldwide CAT C12.9 Parts Supply
Alfa Marine Spare Parts supplies Caterpillar C12.9 components to yacht operators, vessel owners, marine engineers, shipyards, repair companies and other marine professionals worldwide.
We support enquiries from major maritime locations including Miami and Fort Lauderdale, Houston, Rotterdam, Antwerp, Genoa, Barcelona, Monaco, Dubai, Fujairah and Singapore, as well as vessels requiring replacement parts at other international ports.
Request Caterpillar C12.9 Parts
Looking for a C12.9 fuel injector, turbocharger, water pump, oil pump, cylinder head, piston, liner, sensor, gasket or overhaul component?
Send us the existing part number and required quantity.
If you do not know the part number, send the Caterpillar C12.9 engine serial number and clear photographs of the component and engine identification plate.
Email: request@alfamarinespareparts.com
Frequently Asked QuestionsDo you supply Caterpillar C12.9 marine engine spare parts?
Yes. Alfa Marine Spare Parts supplies and sources C12.9 replacement components for maintenance, repair and overhaul requirements.
Can you identify CAT C12.9 parts from the engine serial number?
Yes. Send the complete engine serial number, arrangement information where available, component description and photographs.
Do you supply Caterpillar C12.9 fuel injectors?
Yes. We can source C12.9 fuel injectors and related fuel-system components. The exact injector reference should be checked against the engine configuration.
Can you supply CAT C12.9 turbochargers?
Yes. We can source new and applicable remanufactured turbocharger options according to the required part number and engine configuration.
Do you supply Caterpillar C12.9 water pumps?
Yes. We can assist with applicable sea water pumps, fresh-water pumps and related cooling-system components.
Can you supply C12.9 overhaul parts?
Yes. We can source pistons, rings, liners, bearings, cylinder-head components, valves, gaskets, seals, injectors, pumps and other components required for engine repair and overhaul work.
Do you ship Caterpillar C12.9 parts worldwide?
Yes. Alfa Marine Spare Parts supplies engine components to customers, vessels, yacht operators, repair companies and shipyards worldwide.