Cummins 855 Series Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Cummins 855 Series marine engine parts and spares for commercial vessels, workboats, fishing vessels, auxiliary engines, marine generator installations and other marine applications.
Our Cummins 855 Series parts sourcing covers important engine configurations including the Cummins N855, NT855 and NTA855, with components for scheduled maintenance, engine repair, top-end overhaul and major engine rebuild requirements.
Depending on engine configuration and availability, we can source genuine, OEM and replacement Cummins 855 parts, including fuel-system components, injectors, cylinder heads, pistons, cylinder liners, bearings, turbochargers, aftercooler components, cooling-system parts, pumps, gaskets, seals and overhaul components.
The Cummins 855 engine family uses a heavy-duty 14-litre inline six-cylinder diesel architecture with a displacement of 855 cubic inches.
For individual engine requirements, visit:
Cummins N855 Marine Engine Parts
Cummins NT855 Marine Engine Parts
Cummins NTA855 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 855 Series Marine Engine Overview
The Cummins 855 Series is one of Cummins' established heavy-duty diesel-engine platforms with a long history in commercial marine applications.
The family takes its name from its displacement of approximately 855 cubic inches, equivalent to 14 litres.
Marine configurations within the wider platform include:
Cummins N855
Cummins NT855
Cummins NTA855
The platform uses an inline six-cylinder, four-stroke diesel configuration with a 140 mm bore and 152 mm stroke.
Cummins' marine documentation identifies NT855 and NTA855 configurations for propulsion and auxiliary applications.
The different engine designations are important.
Depending on configuration, differences can involve:
- Aspiration
- Turbocharging
- Aftercooling
- Engine rating
- Fuel-system calibration
- Cooling arrangement
- Turbocharger specification
- Intake components
- Exhaust components
- Auxiliary equipment
Parts should therefore never be selected using only the general 855 family designation.
Cummins 855 Series Technical SpecificationsSpecificationCummins 855 SeriesManufacturerCumminsEngine family855 SeriesEngine type4-stroke dieselCylinder configurationInline 6-cylinderDisplacement14 L / 855 in³Bore140 mmStroke152 mmFuel systemCummins Pressure-Time (PT)NT855 aspirationTurbochargedNTA855 aspirationTurbocharged / aftercooledRotationCounterclockwise facing flywheelCoolingMarine configuration dependentApplicationsPropulsion, auxiliary and other marine applicationsParts identificationESN, CPL and engine configuration dependent
Exact output, rated speed, aspiration and installed components vary according to engine model and rating.
Cummins 855 Series Marine Engine ModelsCummins N855
The Cummins N855 designation represents the wider 14-litre 855 platform and remains part of Cummins' current marine product information.
Current Cummins marine documentation lists N855 applications for:
- Marine propulsion
- Commercial marine
- Auxiliary engines
- Recreational marine applications
Depending on the specific configuration, N855-family parts requirements can include:
- Fuel-system components
- Fuel injectors
- Cylinder heads
- Pistons
- Cylinder liners
- Connecting rods
- Bearings
- Cooling-system components
- Oil-system components
- Gaskets
- Seals
- Overhaul components
For model-specific requirements, visit our Cummins N855 Marine Engine Parts page.
Cummins NT855
The Cummins NT855 is a turbocharged configuration within the 855 engine family.
Cummins marine documentation identifies NT855-M propulsion configurations as well as NT855-DM fixed-speed auxiliary configurations.
Parts requirements can include:
- Fuel injectors
- PT fuel-system components
- Cylinder heads
- Pistons
- Cylinder liners
- Connecting rods
- Main bearings
- Connecting-rod bearings
- Turbochargers
- Water pumps
- Oil pumps
- Heat exchanger components
- Gaskets
- Seals
- Overhaul components
For model-specific information, visit our Cummins NT855 Marine Engine Parts page.
Cummins NTA855
The Cummins NTA855 is the turbocharged and aftercooled configuration within the 855 family.
Cummins continues to list the NTA855 in its marine product material for commercial propulsion and auxiliary applications.
The addition of aftercooling means that NTA855 intake and cooling-system requirements should not automatically be treated as identical to NT855 components.
NTA855 parts requirements can include:
- Fuel injectors
- PT fuel-system components
- Cylinder heads
- Pistons
- Cylinder liners
- Connecting rods
- Bearings
- Turbochargers
- Aftercooler components
- Water pumps
- Heat exchanger components
- Oil pumps
- Gaskets
- Seals
- Overhaul components
For model-specific information, visit our Cummins NTA855 Marine Engine Parts page.
Cummins 855 Series Fuel System Parts
The Cummins 855 marine platform uses the Cummins Pressure-Time (PT) fuel system.
Fuel-system requirements can include:
- Fuel injectors
- PT fuel pumps
- Fuel-pump components
- Injector components
- Fuel transfer components
- Fuel filters
- Fuel lines
- Fuel fittings
- Fuel-control components
- Governor components
- Fuel shutoff components
- O-rings
- Gaskets
- Seals
Correct fuel-system identification is particularly important because different engine ratings and CPLs can use different components.
Always provide the ESN, CPL and existing fuel-system part number whenever available.
Cummins 855 Series Fuel Injectors
Fuel injector requirements can include:
- Complete fuel injectors
- Injector components
- Injector sealing components
- O-rings
- Associated fuel-system parts
When requesting injectors, provide:
Engine model: N855 / NT855 / NTA855
Engine Serial Number (ESN):
CPL:
Existing injector number:
Quantity:
Do not assume that every 855 engine uses the same injector specification.
Cummins 855 Series Cylinder Head Parts
The 855 platform uses individual cylinder-head sections serving groups of cylinders rather than one long cylinder head covering the entire inline-six engine.
Cylinder-head requirements can include:
- Cylinder-head assemblies
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Crosshead components
- Rocker components
- Injector components
- Cylinder-head gaskets
- Seals
- Related hardware
Correct cylinder-head identification should be based on the individual engine specification.
Cummins 855 Series Pistons & Cylinder Liners
Internal-engine requirements can include:
- Pistons
- Piston rings
- Piston pins
- Replaceable cylinder liners
- Liner seals
- Connecting rods
- Connecting-rod bushings
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft components
- Gaskets
- O-rings
The replaceable liner design helps support major rebuilding of the 855 platform.
Piston and liner specifications can vary according to engine rating and production configuration.
Cummins 855 Series Turbocharger Parts
Turbocharging is an important feature of the NT855 and NTA855 configurations.
Turbocharger requirements can include:
- Complete turbochargers
- Turbocharger cartridges
- Compressor components
- Turbine components
- Shafts
- Bearings
- Seals
- Oil-feed components
- Oil-return components
- Exhaust connections
- Intake connections
- Mounting gaskets
Different 855 ratings can use different turbocharger specifications.
For correct identification, provide:
Engine Model + ESN + CPL + Turbocharger NumberCummins NTA855 Aftercooler Parts
The NTA855 uses a turbocharged and aftercooled configuration.
Aftercooler requirements can include:
- Aftercooler assemblies
- Aftercooler cores
- Covers
- Sealing components
- Gaskets
- O-rings
- Cooling connections
- Intake connections
- Mounting components
The aftercooling arrangement is one of the important distinctions between applicable NT855 and NTA855 configurations.
Always provide the complete engine designation when requesting these components.
Cummins 855 Series Marine Cooling Parts
Marine cooling arrangements can include heat-exchanger or keel-cooled configurations depending on engine specification and vessel installation.
Cooling-system requirements can include:
- Sea water pumps
- Raw-water pumps
- Jacket-water pumps
- Heat exchangers
- Thermostats
- Thermostat housings
- Oil coolers
- Aftercooler components
- Cooling pipes
- Hoses
- Mechanical seals
- Bearings
- Gaskets
- O-rings
Correct cooling-system components should be selected according to the installed engine arrangement.
Cummins 855 Series Sea Water Pump Parts
Applicable marine installations can require:
- Complete sea water pumps
- Raw-water pumps
- Pump housings
- Pump shafts
- Impellers
- Bearings
- Mechanical seals
- Covers
- Gaskets
- O-rings
- Repair components
If the existing pump number is unknown, send clear photographs of the pump together with the engine identification information.
Cummins 855 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
Pump selection should always be verified using the engine ESN and CPL.
Cummins 855 Series Heat Exchanger Parts
Heat-exchanger-cooled marine configurations can require:
- Complete heat exchangers
- Heat exchanger cores
- End covers
- Gaskets
- O-rings
- Seals
- Cooling connections
- Mounting components
Marine cooling configurations can vary considerably, particularly on older engines that may have been modified during their service life.
Cummins 855 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
Cummins marine configurations can use different oil-pan capacities and lubrication-system arrangements according to application.
Cummins 855 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 855 Series Camshaft & Timing Parts
Timing and valve-train requirements can include:
- Camshafts
- Camshaft bushings
- Camshaft gears
- Timing gears
- Gear-train components
- Injector-actuation components
- Valve-train components
- Covers
- Gaskets
- Seals
Correct components should always be selected according to the individual engine specification.
Cummins 855 Series Intake & Exhaust Parts
Intake and exhaust requirements can include:
- Intake manifolds
- Exhaust manifolds
- Turbocharger connections
- Air-intake components
- Exhaust connections
- Exhaust elbows
- Aftercooler connections on applicable NTA engines
- Gaskets
- Seals
- Clamps
- Mounting hardware
Marine exhaust arrangements can vary according to vessel installation.
Cummins 855 Series Starter & Alternator Parts
Electrical and starting-system requirements can include:
- Starter motors
- Air starters on applicable installations
- Starter solenoids
- Alternators
- Charging-system components
- Sensors
- Switches
- Gauges
- Wiring
- Electrical connectors
Before ordering electrical components, verify the system voltage and existing component number.
Cummins 855 Series Gaskets & Seals
Gasket and sealing requirements can include:
- Cylinder-head gaskets
- Valve-cover gaskets
- Intake gaskets
- Exhaust 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 855 Series Overhaul Parts
For a Cummins 855 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
- PT fuel-system components
- Turbocharger components
- Aftercooler components
- Water pumps
- Oil pumps
- Oil cooler components
- Gaskets
- O-rings
- Seals
The exact overhaul requirement should always be prepared according to the engine model, ESN and CPL.
Cummins 855 Series Top-End Overhaul Parts
Top-end requirements can include:
- Cylinder-head components
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Crosshead components
- Rocker components
- Fuel injectors
- Injector components
- Cylinder-head gaskets
- O-rings
- Seals
For a complete top-end requirement, provide the engine identification information and required quantities.
Cummins N855 vs NT855 vs NTA855
The N855, NT855 and NTA855 belong to the same wider 855-cubic-inch engine platform, but the model designations should not be treated as interchangeable.
All are based around the 14-litre inline-six architecture.
Important configuration differences include turbocharging and aftercooling.
NT855 — turbocharged configurations
NTA855 — turbocharged and aftercooled configurations
The wider N855 designation is also used by Cummins for current marine product information covering 855-platform engines.
Differences between individual models and ratings can affect:
- Pistons
- Fuel injectors
- Fuel-system components
- Turbochargers
- Aftercooler components
- Cooling-system parts
- Intake components
- Exhaust components
- Gaskets and seals
- Engine ratings
Always identify the exact engine designation before ordering components.
Cummins 855 Series Marine Applications
Cummins documents the 855 platform for both marine propulsion and auxiliary applications.
Depending on engine configuration, applications can include:
- Commercial vessels
- Fishing vessels
- Workboats
- Tugboats
- Passenger vessels
- Marine auxiliary engines
- Marine generator applications
- Recreational vessels
- Yacht support vessels
Cummins' current marine information continues to list N855-family products, demonstrating the long service life of the platform.
Cummins 855 Series Engine Identification
Correct identification is especially important for older 855 engines because engines may have undergone rebuilds, component updates or configuration changes during decades of service.
When requesting parts, provide:
Engine family: Cummins 855 Series
Engine model: N855 / NT855 / NTA855
Engine Serial Number (ESN):
CPL number:
Existing part number:
Part description:
Quantity:
For turbochargers, fuel pumps, injectors, water pumps, starters and alternators, clear photographs of the existing component can also assist.
The preferred identification sequence is:
Engine Model + ESN + CPL + Existing Part NumberWhy Source Cummins 855 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 855 Series marine engine parts and spares.
Depending on availability, we can assist with:
- Routine maintenance parts
- Fuel injectors
- PT fuel-system components
- Cylinder heads
- Pistons
- Cylinder liners
- Bearings
- Internal engine components
- Crankshaft components
- Turbochargers
- Aftercooler components
- Sea water pumps
- Jacket-water pumps
- Heat exchanger components
- Oil pumps
- Lubrication-system components
- Starting-system parts
- Gaskets and seals
- Top-end overhaul parts
- Complete overhaul requirements
- Genuine parts
- OEM parts
- Replacement parts
For individual engines, visit our Cummins N855 Marine Engine Parts, Cummins NT855 Marine Engine Parts and Cummins NTA855 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 855 Series?
The Cummins 855 Series is a heavy-duty inline six-cylinder diesel-engine platform with approximately 855 cubic inches or 14 litres of displacement.
Which Cummins 855 Marine Engines Are Included?
Important marine designations include the N855, NT855 and NTA855.
How Many Cylinders Does the Cummins 855 Have?
The platform uses an inline six-cylinder configuration.
What Is the Cummins 855 Bore and Stroke?
Cummins specifies a 140 mm bore and 152 mm stroke.
What Fuel System Does the Cummins 855 Use?
Cummins specifies its Pressure-Time (PT) fuel system for the marine 855 platform.
What Is the Difference Between NT855 and NTA855?
The NT855 uses a turbocharged configuration, while the NTA855 designation is associated with turbocharging and aftercooling.
Can You Supply Cummins 855 Fuel Injectors?
Yes. We can assist with applicable injector requirements. Provide the engine model, ESN, CPL and existing injector number.
Can You Supply Cummins 855 Turbochargers?
Yes. We can assist with applicable turbochargers and related components for NT855 and NTA855 configurations.
Can You Supply NTA855 Aftercooler Parts?
Yes. Depending on configuration and availability, we can assist with aftercooler components, gaskets, seals and associated cooling parts.
Can You Supply Cummins 855 Sea Water Pumps?
Yes. We can assist with applicable sea water pumps and other marine cooling-system components.
Can You Supply Cummins 855 Overhaul Parts?
Yes. Depending on configuration and availability, we can assist with pistons, rings, liners, bearings, cylinder-head components, fuel-system parts, turbocharger components, gaskets, seals and other overhaul components.
Related Cummins Marine Engine Pages
Cummins N855 Marine Engine Parts
Cummins NT855 Marine Engine Parts
Cummins NTA855 Marine Engine Parts
Cummins KTA19 Marine Engine Parts
Cummins VTA28 Marine Engine Parts
Cummins KTA38 Marine Engine Parts
Cummins KTA50 Marine Engine Parts
Request Cummins 855 Series Marine Engine Parts
Looking for Cummins 855 Series marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: N855 / NT855 / NTA855
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 855 Series parts for commercial vessels, fishing vessels, workboats, shipyards, marine repair companies and engine rebuilders.