Cummins C Series Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Cummins C Series marine engine parts and spares for commercial vessels, workboats, fishing vessels, auxiliary engines, marine generator sets and other marine applications.
Our Cummins C Series sourcing covers the Cummins 6CT and 6CTA8.3 marine engine family, including parts for scheduled maintenance, engine repairs, top-end overhaul and complete engine rebuild requirements.
Depending on engine configuration and availability, we can source genuine, OEM and replacement Cummins C Series parts, including fuel injection components, cylinder heads, pistons, cylinder liners, bearings, turbochargers, cooling-system components, pumps, gaskets, seals and overhaul parts.
The Cummins C Series marine platform uses a robust 8.3-litre inline six-cylinder diesel architecture developed for demanding marine applications.
For individual engine requirements, visit:
Cummins 6CT Marine Engine Parts
Cummins 6CTA8.3 Marine Engine Parts
For other Cummins engines, browse our Cummins Marine Engine Parts catalogue.
For correct parts identification, provide the complete engine model, Engine Serial Number (ESN), CPL number and existing part number whenever available.
Need a specific component? Request a Quote or email request@alfamarinespareparts.com.
Cummins C Series Marine Engine Overview
The Cummins C Series is a heavy-duty diesel-engine platform used in commercial marine, auxiliary and other demanding applications.
For the marine 8.3-litre platform, two important configurations are:
Cummins 6CT / 6CT8.3 — turbocharged
Cummins 6CTA / 6CTA8.3 — turbocharged and aftercooled
Both use an inline six-cylinder, four-stroke diesel configuration with an 8.3-litre displacement.
The marine C Series was designed for high-hour operation and uses replaceable wet cylinder liners, helping support engine rebuilding and long-term service.
Different engine arrangements can use different fuel, cooling, turbocharger, aftercooler and accessory components.
Parts should therefore always be selected according to the individual engine identification rather than from the C Series family name alone.
Cummins C Series Technical SpecificationsSpecificationCummins 6CT / 6CTA8.3Engine type4-stroke dieselConfigurationInline 6-cylinderDisplacement8.3 LBore114 mmStroke135 mm6CT aspirationTurbocharged6CTA aspirationTurbocharged / aftercooledFuel systemInline injection pumpRotationCounterclockwise facing flywheelMarine power range122–201 kWMarine horsepower range164–270 hpCoolingHeat exchanger or applicable keel-cooling arrangementApplicationsCommercial marine, auxiliary and recreational
Exact ratings and equipment depend on the individual engine model and application.
Cummins C Series Marine Engine ModelsCummins 6CT / 6CT8.3
The Cummins 6CT is the turbocharged configuration of the 8.3-litre C Series marine platform.
It uses an inline six-cylinder design with mechanical inline fuel injection and was developed for demanding marine operation.
Parts requirements can include:
- Fuel injectors
- Fuel injection pumps
- Cylinder heads
- Pistons
- Piston rings
- Cylinder liners
- Bearings
- Turbochargers
- Cooling-system components
- Water pumps
- Oil pumps
- Gaskets
- Seals
- Overhaul components
For model-specific information, visit our Cummins 6CT Marine Engine Parts page.
Cummins 6CTA / 6CTA8.3
The Cummins 6CTA8.3 shares the 8.3-litre C Series architecture but uses a turbocharged and aftercooled configuration.
The aftercooling system is an important distinction when identifying intake, cooling and turbocharging components.
Parts requirements can include:
- Fuel injectors
- Fuel injection pumps
- Cylinder heads
- Pistons
- Cylinder liners
- Turbochargers
- Aftercooler components
- Water pumps
- Heat exchanger components
- Oil pumps
- Bearings
- Gaskets
- Seals
- Overhaul components
For model-specific information, visit our Cummins 6CTA8.3 Marine Engine Parts page.
Cummins C Series Fuel System Parts
The marine 6CT/6CTA8.3 platform uses an inline mechanical injection-pump fuel system.
Fuel-system requirements can include:
- Fuel injection pumps
- Fuel injectors
- Injector nozzles
- Fuel transfer pumps
- Fuel filters
- Fuel lines
- Fuel shutoff components
- Governor components
- Fuel fittings
- Seals
- O-rings
- Gaskets
Fuel-system components should be identified using the complete engine model, ESN, CPL and existing component number.
Cummins C Series Cylinder Head Parts
Cylinder-head requirements can include:
- Complete cylinder heads
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker components
- Push rods
- Cylinder-head gaskets
- Seals
- Related hardware
The C Series uses a one-piece crossflow cylinder-head design.
For complete cylinder-head or top-end overhaul requirements, provide the engine ESN and CPL.
Cummins C Series Pistons & Cylinder Liners
Internal-engine requirements can include:
- Pistons
- Piston rings
- Piston pins
- Replaceable wet cylinder liners
- Liner seals
- Connecting rods
- Connecting-rod bushings
- Main bearings
- Connecting-rod bearings
- Thrust components
- Gaskets
- O-rings
The use of replaceable wet cylinder liners makes the C Series suitable for major engine rebuilds when the engine block and other major components remain serviceable.
Correct piston and liner specifications should always be confirmed against the individual engine.
Cummins C Series Turbocharger Parts
Both 6CT and 6CTA marine configurations use turbocharging.
Turbocharger requirements can include:
- Complete turbochargers
- Turbocharger cartridges
- Compressor components
- Turbine components
- Bearings
- Shafts
- Seals
- Oil-feed lines
- Oil-return components
- Exhaust connections
- Intake connections
- Mounting gaskets
Do not assume that the same turbocharger is used across every C Series rating.
Provide the ESN, CPL and existing turbocharger number whenever possible.
Cummins C Series Aftercooler Parts
Aftercooling is an important distinction between the two main configurations.
6CT — turbocharged
6CTA — turbocharged and aftercooled
Applicable 6CTA aftercooler requirements can include:
- Aftercooler assemblies
- Aftercooler cores
- Covers
- Seals
- O-rings
- Gaskets
- Cooling connections
- Intake connections
- Mounting components
Always specify whether the engine is a 6CT or 6CTA when requesting air-intake and aftercooler components.
Cummins C Series Marine Cooling Parts
Marine C Series cooling arrangements can use an engine-mounted heat exchanger or applicable keel-cooling configuration.
Cooling-system requirements can include:
- Sea water pumps
- Raw-water pumps
- Jacket-water pumps
- Heat exchangers
- Thermostats
- Oil coolers
- Aftercooler components
- Cooling pipes
- Hoses
- Pump seals
- Bearings
- Gaskets
- O-rings
The installed cooling arrangement should always be identified before ordering replacement components.
Cummins C Series Sea Water Pump Parts
For applicable heat-exchanger-cooled marine installations, sea-water pump requirements can include:
- Complete sea water pumps
- Pump housings
- Pump shafts
- Impellers
- Bearings
- Mechanical seals
- Covers
- Gaskets
- O-rings
- Repair components
Provide the existing pump number whenever available.
Photographs can also assist with identification when the original part number cannot be read.
Cummins C Series Jacket-Water Pump Parts
Jacket-water pump requirements can include:
- Complete coolant pumps
- Pump housings
- Impellers
- Shafts
- Bearings
- Mechanical seals
- Gaskets
- O-rings
- Repair components
Correct pump identification depends on the individual engine configuration.
Cummins C Series Lubrication Parts
Lubrication-system requirements can include:
- Engine oil pumps
- Oil filters
- Oil coolers
- Oil-pressure regulators
- Oil-pressure switches
- Oil lines
- Oil-pan components
- Crankshaft seals
- Gaskets
- O-rings
The marine platform uses a marine-oriented lubrication arrangement, but individual components can vary according to engine specification.
Cummins C Series Crankshaft & Bearing Parts
Major internal-engine requirements can include:
- Crankshafts
- Main bearings
- Connecting-rod bearings
- Thrust bearings
- Connecting rods
- Connecting-rod bushings
- Crankshaft gears
- Front crankshaft seals
- Rear crankshaft seals
- Vibration-damper components
For major internal components, provide:
Engine Model + ESN + CPL + Existing Part NumberCummins C Series Gaskets & Seals
Gasket and sealing requirements can include:
- Cylinder-head gaskets
- Valve-cover gaskets
- Intake-manifold gaskets
- Exhaust-manifold gaskets
- Turbocharger gaskets
- Aftercooler gaskets
- Oil-pan gaskets
- Water-pump gaskets
- Crankshaft seals
- Liner seals
- Fuel-system seals
- O-rings
Complete gasket requirements can also be prepared together with associated overhaul components.
Cummins C Series Overhaul Parts
For a Cummins C Series engine overhaul, Alfa Marine Spare Parts can assist with applicable:
- Pistons
- Piston rings
- Piston pins
- Cylinder liners
- Liner seals
- Main bearings
- Connecting-rod bearings
- Connecting rods
- Cylinder-head components
- Intake valves
- Exhaust valves
- Fuel injectors
- Fuel injection components
- Turbocharger components
- Aftercooler components
- Water pumps
- Oil pumps
- Oil cooler components
- Gaskets
- O-rings
- Seals
The exact overhaul requirement should be prepared against the individual engine specification.
Cummins C Series Top-End Overhaul Parts
Top-end requirements can include:
- Cylinder-head components
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker components
- Fuel injectors
- Injector nozzles
- Cylinder-head gaskets
- O-rings
- Seals
For complete top-end requirements, provide the engine ESN and CPL.
Cummins C Series Marine Applications
Cummins identifies the 6CT/6CTA8.3 for marine applications including commercial marine, auxiliary engines and recreational marine installations.
Depending on configuration, the platform can be used for applications including:
- Commercial vessels
- Workboats
- Fishing vessels
- Auxiliary engines
- Ship-service power
- Emergency power
- Fire-pump drives
- Hydraulic power units
- Recreational marine applications
Engine rating and configuration should always be verified for the individual installation.
Cummins 6CT vs 6CTA8.3
Although the 6CT and 6CTA belong to the same 8.3-litre C Series platform, they should not be treated as identical engines.
The principal distinction is:
Cummins 6CT — turbocharged
Cummins 6CTA — turbocharged and aftercooled
Both use:
- 8.3-litre displacement
- Inline six-cylinder architecture
- Four-stroke diesel operation
- 114 mm bore
- 135 mm stroke
- Inline injection-pump fuel system
However, differences can exist in:
- Turbochargers
- Intake components
- Aftercooling equipment
- Cooling-system components
- Fuel-system calibration
- Engine ratings
- Gaskets and seals
- Accessory equipment
Always use the complete engine designation when requesting parts.
Cummins C Series Engine Identification
Correct engine identification is essential when sourcing components for the C Series.
When requesting parts, provide:
Engine family: Cummins C Series
Engine model: 6CT / 6CT8.3 / 6CTA / 6CTA8.3
Engine Serial Number (ESN):
CPL number:
Existing part number:
Part description:
Quantity:
For fuel injection pumps, turbochargers, water pumps, starters and alternators, photographs of the existing component can also assist with identification.
The preferred identification sequence is:
Engine Model + ESN + CPL + Existing Part NumberWhy Source Cummins C Series Parts From Alfa Marine Spare Parts?
Alfa Marine Spare Parts supports shipowners, vessel operators, ship managers, shipyards, marine engineers, purchasing departments, repair companies and engine rebuilders with Cummins C Series marine engine parts and spares.
Depending on availability, we can assist with:
- Routine maintenance parts
- Fuel injection components
- Fuel injectors
- Fuel injection pumps
- Cylinder heads
- Pistons
- Cylinder liners
- Bearings
- Internal engine components
- Turbochargers
- Aftercooler components
- Sea water pumps
- Jacket-water pumps
- Heat exchanger components
- Oil pumps
- Lubrication-system parts
- Electrical components
- Gaskets and seals
- Top-end overhaul components
- Complete overhaul requirements
- Genuine parts
- OEM parts
- Replacement parts
For individual engine requirements, visit our Cummins 6CT Marine Engine Parts and Cummins 6CTA8.3 Marine Engine Parts pages.
You can also browse our Cummins Marine Engine Parts catalogue and Marine Spare Parts Catalogue.
Alfa Marine Spare Parts is an independent marine spare-parts supplier and is not an official Cummins dealer.
Frequently Asked QuestionsWhat Is the Cummins C Series Marine Engine?
The Cummins C Series includes the 8.3-litre 6CT and 6CTA marine engine configurations used in commercial, auxiliary and other marine applications.
What Is the Displacement of the Cummins 6CT and 6CTA?
Both use an 8.3-litre displacement.
How Many Cylinders Does the Cummins C Series Have?
The marine 6CT/6CTA8.3 platform uses an inline six-cylinder configuration.
What Is the Difference Between the Cummins 6CT and 6CTA?
The 6CT is turbocharged, while the 6CTA uses turbocharging and aftercooling.
What Is the Bore and Stroke?
The 6CT/6CTA8.3 uses a 114 mm bore and 135 mm stroke.
What Fuel System Does the Cummins 6CT/6CTA Use?
Cummins specifies an inline injection pump for the marine 6CT/6CTA8.3 platform.
Can You Supply Cummins C Series Fuel Injection Parts?
Yes. We can assist with applicable injectors, nozzles, fuel injection pumps, transfer pumps and related fuel-system components.
Can You Supply Cummins 6CT Turbochargers?
Yes. We can assist with applicable turbochargers and associated components. Provide the ESN, CPL and existing turbocharger number.
Can You Supply Cummins 6CTA8.3 Aftercooler Parts?
Yes. Depending on configuration and availability, we can assist with aftercooler cores, seals, gaskets and related components.
Can You Supply Cummins C Series Sea Water Pumps?
Yes. We can assist with applicable sea water pumps and cooling-system components for marine installations.
Can You Supply Cummins C Series Overhaul Parts?
Yes. We can assist with applicable pistons, rings, liners, bearings, cylinder-head components, fuel-system parts, turbocharger components, gaskets and seals.
Related Cummins Marine Engine Pages
Cummins 6CT Marine Engine Parts
Cummins 6CTA8.3 Marine Engine Parts
Cummins QSC8.3 Marine Engine Parts
Cummins QSL9 Marine Engine Parts
Cummins QSM11 Marine Engine Parts
Request Cummins C Series Marine Engine Parts
Looking for Cummins C Series marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: 6CT / 6CT8.3 / 6CTA / 6CTA8.3
Engine Serial Number (ESN):
CPL number:
Existing part number:
Part description:
Quantity:
Required condition: Genuine / OEM / Replacement
Delivery destination:
Required date:
If the part number is unknown, include clear photographs of the engine identification plate and existing component.
Email: request@alfamarinespareparts.com
You can also browse our Cummins Marine Engine Parts catalogue.
Worldwide supply of Cummins C Series parts for commercial vessels, workboats, fishing vessels, shipyards, marine repair companies and engine rebuilders.