Caterpillar 3306 Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Caterpillar 3306 marine engine parts and spares for commercial vessels, fishing vessels, workboats, auxiliary engines, marine generator applications and other vessel installations.
We source genuine, OEM, replacement and applicable Reman Caterpillar 3306 parts, subject to availability, for scheduled maintenance, engine repairs, top-end overhaul and major engine rebuild requirements.
Our sourcing capabilities cover fuel injection components, fuel injectors, cylinder heads, pistons, piston rings, cylinder liners, connecting rods, crankshafts, bearings, turbochargers, sea water pumps, jacket-water pumps, heat exchangers, oil pumps, oil coolers, starters, alternators, gaskets, seals and overhaul components.
The Caterpillar 3306 is an inline six-cylinder four-stroke diesel engine belonging to Caterpillar's long-running 3300 Series and has documented marine-engine applications.
For other Caterpillar engines, visit our Caterpillar Marine Engine Parts & Rebuild Kits page.
You can also browse our Caterpillar Engine Parts Catalogue.
For correct parts identification, provide the complete engine model, engine serial number, serial-number prefix, arrangement number and existing part number whenever available.
Need a specific Caterpillar 3306 component? Request a Quote or email request@alfamarinespareparts.com.
Caterpillar 3306 Marine Engine Overview
The Caterpillar 3306 is an inline six-cylinder four-stroke diesel engine from Caterpillar's 3300 Series.
The 3306 platform was produced for marine and numerous other heavy-duty applications and remains in service in older commercial vessels and marine installations around the world.
The engine belongs to approximately the 10.5-litre displacement class.
Caterpillar produced the 3306 in multiple configurations over its service life.
Individual engines can differ according to:
- Engine serial number
- Serial-number prefix
- Arrangement number
- Power rating
- Rated engine speed
- Aspiration
- Fuel-system arrangement
- Turbocharger specification
- Cooling-system configuration
- Marine installation
- Accessory equipment
- Production revision
Because the 3306 is a legacy engine with many possible arrangements, replacement components should always be identified against the individual engine.
Caterpillar 3306 Technical OverviewSpecificationCaterpillar 3306ManufacturerCaterpillarEngine model3306Engine familyCaterpillar 3300 SeriesEngine type4-stroke dieselCylinder configurationInlineNumber of cylinders6Displacement classApprox. 10.5 LFuel systemMechanical, configuration dependentAspirationConfiguration dependentCoolingMarine configuration dependentApplicationsMarine and other heavy-duty applicationsParts identificationSerial number and arrangement dependent
Exact power output, rated speed, aspiration, turbocharger arrangement, cooling equipment and accessories vary according to the individual Caterpillar 3306 configuration.
For this reason, Alfa Marine Spare Parts recommends identifying components using the engine serial number, arrangement number and existing part number rather than ordering by the 3306 model designation alone.
Caterpillar 3306 Marine Engine Parts
Alfa Marine Spare Parts can assist with a broad selection of Caterpillar 3306 engine parts for routine maintenance, repairs and complete overhaul requirements.
Parts categories include:
- Cylinder-head components
- Pistons
- Piston rings
- Cylinder liners
- Connecting rods
- Crankshaft components
- Main and connecting-rod bearings
- Fuel injection components
- Fuel injectors
- Fuel pumps
- Governor components
- Turbocharger components
- Cooling-system parts
- Lubrication-system components
- Intake and exhaust parts
- Electrical components
- Gaskets and seals
- Overhaul components
You can also browse our Marine Spare Parts Catalogue.
Caterpillar 3306 Cylinder Head Parts
Cylinder-head requirements can include:
- Complete cylinder heads
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker arms
- Rocker shafts
- Push rods
- Valve covers
- Cylinder-head gaskets
- Sealing components
- Fasteners
For cylinder-head repairs or top-end overhaul requirements, provide the complete engine serial number and existing component numbers whenever available.
Caterpillar 3306 Pistons & Cylinder Parts
Internal-engine requirements can include:
- Pistons
- Piston rings
- Piston pins
- Cylinder liners
- Cylinder-liner seals
- Connecting rods
- Connecting-rod bushings
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft components
- Gaskets
- O-rings
- Seals
Correct piston, liner and bearing identification is particularly important when preparing a complete 3306 engine overhaul.
Caterpillar 3306 Cylinder Liners
Cylinder-liner requirements can include:
- Cylinder liners
- Liner sealing components
- O-rings
- Associated gaskets
- Pistons
- Piston rings
- Overhaul components
When preparing a major overhaul requirement, send the engine serial number together with any existing piston and liner part numbers.
Caterpillar 3306 Fuel Injection Parts
The Caterpillar 3306 uses mechanical diesel fuel-injection equipment, with the exact components dependent on engine configuration.
Fuel-system requirements can include:
- Fuel injection pumps
- Fuel injectors
- Injector nozzles
- Fuel transfer pumps
- Fuel filters
- Fuel lines
- Fuel fittings
- Fuel priming components
- Fuel shutoff components
- Governor components
- Fuel-system gaskets
- O-rings
- Seals
Because the 3306 was produced in numerous arrangements, fuel-system components should always be identified against the individual engine.
Caterpillar 3306 Fuel Injectors
For Caterpillar 3306 injector requirements, provide:
Engine model: Caterpillar 3306
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing injector or nozzle number:
Quantity:
This information helps identify the correct injector or nozzle specification and any applicable replacement reference.
Caterpillar 3306 Fuel Injection Pump Parts
Fuel injection pump requirements can include:
- Complete fuel injection pumps
- Pump elements
- Plungers
- Barrels
- Delivery components
- Governor components
- Fuel-control components
- Seals
- Gaskets
- Related hardware
For complete fuel injection pump requirements, provide photographs of the existing pump identification plate together with the engine serial number.
Caterpillar 3306 Turbocharger Parts
Applicable Caterpillar 3306 marine configurations use turbocharging.
Turbocharger requirements can include:
- Complete turbochargers
- Applicable Reman turbochargers
- Turbocharger cartridges
- Compressor components
- Turbine components
- Bearings
- Seals
- Oil-feed components
- Oil-return components
- Intake connections
- Exhaust connections
- Mounting gaskets
Caterpillar currently identifies turbocharger 2W-3556 as compatible with both 3306 and 3306B Marine Engines, with 20R-7013 shown as a Reman alternative.
This does not mean every 3306 uses this turbocharger.
Always verify compatibility against the individual engine serial number and arrangement.
Caterpillar 3306 Cooling System Parts
Marine cooling-system requirements can include:
- Sea water pumps
- Raw-water pumps
- Jacket-water pumps
- Heat exchangers
- Oil coolers
- Thermostats
- Thermostat housings
- Cooling pipes
- Hoses
- Pump shafts
- Bearings
- Mechanical seals
- Gaskets
- O-rings
Marine cooling arrangements can differ considerably from industrial and generator 3306 configurations.
Always specify Caterpillar 3306 Marine Engine when requesting cooling-system components.
Caterpillar 3306 Sea Water Pump Parts
Depending on the marine installation, sea-water pump requirements can include:
- Complete sea water pumps
- Raw-water pumps
- Pump housings
- Pump shafts
- Impellers
- Mechanical seals
- Bearings
- Pump covers
- Gaskets
- O-rings
- Repair components
Correct sea-water pump identification can depend on:
- Engine serial number
- Arrangement number
- Existing pump number
- Cooling-system configuration
- Vessel installation
Photographs of the existing pump can assist with identification when the original part number is unknown.
Caterpillar 3306 Jacket-Water Pump Parts
Jacket-water pump requirements can include:
- Complete water pumps
- Pump housings
- Impellers
- Pump shafts
- Bearings
- Mechanical seals
- Gaskets
- O-rings
- Repair components
Correct water-pump components should always be selected according to the individual engine arrangement.
Caterpillar 3306 Heat Exchanger Parts
Applicable marine heat-exchanger requirements can include:
- Complete heat exchangers
- Heat exchanger cores
- End covers
- Gaskets
- O-rings
- Seals
- Cooling connections
- Mounting components
The cooling arrangement can vary according to vessel installation, so the 3306 model designation alone may not identify every heat-exchanger component.
Caterpillar 3306 Oil Pump & 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
Correct lubrication is essential for protecting the crankshaft, bearings, pistons, camshaft and turbocharger during marine operation.
Caterpillar 3306 Crankshaft & Bearing Parts
Crankshaft and bearing requirements can include:
- Crankshafts
- Main bearings
- Connecting-rod bearings
- Thrust components
- Connecting rods
- Connecting-rod bushings
- Crankshaft seals
- Crankshaft gears
- Vibration-damper components
- Associated hardware
Caterpillar continues to identify Reman components for this legacy platform. For example, 0R-1238 is a Cat Reman 3306 crankshaft whose current compatibility listing includes both the 3306 and 3306B Marine Engines.
For major internal-engine requirements, provide:
Engine Serial Number + Arrangement Number + Existing Part NumberCaterpillar 3306 Camshaft & Timing Parts
Timing-system requirements can include:
- Camshafts
- Camshaft bearings
- Camshaft gears
- Timing gears
- Gear-train components
- Bushings
- Covers
- Fasteners
- Gaskets
- Seals
Correct timing components should always be identified against the individual engine arrangement.
Caterpillar 3306 Intake & Exhaust Parts
Intake and exhaust requirements can include:
- Intake manifolds
- Exhaust manifolds
- Air-intake components
- Turbocharger connections
- Exhaust elbows
- Exhaust connections
- Gaskets
- Seals
- Clamps
- Mounting hardware
Marine intake and exhaust arrangements can vary according to engine configuration and vessel installation.
Caterpillar 3306 Starter & Alternator Parts
Electrical and starting-system requirements can include:
- Electric starter motors
- Air starting motors on applicable installations
- Starter solenoids
- Alternators
- Charging-system components
- Oil-pressure switches
- Temperature senders
- Gauges
- Wiring
- Electrical connectors
Caterpillar currently lists 106-5521 Air Starting Motor as compatible with the 3304, 3304B, 3306 and 3306B Marine Engines, with 0R-9855 shown as a Reman alternative.
Before ordering any starting component, verify the engine serial number, existing part number and installed starting arrangement.
Caterpillar 3306 Gaskets & Seals
Gasket and sealing requirements can include:
- Cylinder-head gaskets
- Valve-cover gaskets
- Intake-manifold gaskets
- Exhaust-manifold gaskets
- Turbocharger gaskets
- Oil-pan gaskets
- Water-pump gaskets
- Crankshaft seals
- Oil seals
- Fuel-system seals
- O-rings
- Cylinder-liner seals
Complete gasket requirements can also be prepared together with associated overhaul components.
Caterpillar 3306 Overhaul Parts
For a Caterpillar 3306 engine overhaul, Alfa Marine Spare Parts can assist with applicable:
- Pistons
- Piston rings
- Piston pins
- Cylinder liners
- Liner seals
- Cylinder-head components
- Intake valves
- Exhaust valves
- Connecting rods
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft components
- Camshaft components
- Fuel injectors
- Fuel injection components
- Governor components
- Turbocharger components
- Cooling-system parts
- Water pumps
- Oil pumps
- Oil cooler components
- Gaskets
- O-rings
- Seals
For complete overhaul requirements, send the engine serial number together with the required parts list.
Caterpillar 3306 Top-End Overhaul Parts
Top-end overhaul 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
The final overhaul scope should be determined according to engine condition, operating history and inspection results.
Caterpillar 3306 Reman Parts
Selected Caterpillar Reman components continue to be available for the wider 3306 platform.
Depending on the individual engine and part number, applicable Reman requirements can include:
- Crankshaft components
- Turbochargers
- Starting-system components
- Fuel-system components
- Other major engine components
Current Caterpillar records include examples such as:
0R-1238 — Cat Reman 3306 Crankshaft
20R-7013 — Reman Turbocharger alternative associated with applicable 3306 turbocharger requirements
0R-9855 — Cat Reman Air Starter Motor alternative for applicable starting arrangements
These references should never be ordered from the model designation alone.
Always confirm:
3306 + Engine Serial Number + Existing Part NumberCaterpillar 3306 Marine Applications
Caterpillar continues to identify the 3306 as a Marine Engine in its equipment and parts records.
Depending on configuration and vessel installation, legacy Caterpillar 3306 engines can be encountered in:
- Commercial vessels
- Fishing vessels
- Workboats
- Auxiliary installations
- Marine generator installations
- Other vessel machinery applications
Because the Caterpillar 3306 was also extensively used in industrial and other applications, always specify Marine Engine when requesting parts.
Caterpillar 3306 vs 3306B
The Caterpillar 3306 and Caterpillar 3306B should be treated as separate engine models for parts identification.
Both belong to the wider Caterpillar 3300 Series and use inline six-cylinder architecture.
However, differences can affect:
- Fuel-system components
- Fuel injection equipment
- Governor components
- Cylinder-head components
- Internal engine parts
- Turbocharger arrangements
- Cooling-system components
- Gaskets and seals
- Accessory equipment
- Production revisions
Caterpillar parts records show that some components fit both 3306 and 3306B marine engines, but this does not mean every component is interchangeable.
A dedicated Caterpillar 3306B Marine Engine Parts page should therefore be maintained separately.
Caterpillar 3304 vs 3306
The Caterpillar 3304 and 3306 belong to the same wider 3300 Series.
The main architectural distinction is:
Caterpillar 3304 — inline 4-cylinder
Caterpillar 3306 — inline 6-cylinder
The 3306 therefore belongs to a larger displacement class and uses different major internal components.
For the four-cylinder engine, visit our Caterpillar 3304 Marine Engine Parts page.
Caterpillar 3306 Parts Identification
Correct parts identification is particularly important with legacy Caterpillar engines because individual units may have been rebuilt, modified or fitted with superseded components during their operating life.
When requesting parts, provide:
Engine model: Caterpillar 3306
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing part number:
Part description:
Quantity:
For pumps, fuel injection equipment, turbochargers, starters and alternators, clear photographs of the existing component can also assist with identification.
The preferred identification sequence is:
Caterpillar 3306 Marine + Engine Serial Number + Arrangement Number + Existing Part NumberWhy Source Caterpillar 3306 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 Caterpillar 3306 marine engine parts and spares.
Depending on availability, we can assist with:
- Maintenance parts
- Fuel injectors
- Fuel injection components
- Cylinder-head components
- Pistons and cylinder liners
- Internal engine parts
- Crankshaft components
- Turbochargers
- Cooling-system components
- Sea water pumps
- Jacket-water pumps
- Heat exchanger components
- Lubrication-system parts
- Electrical and starting components
- Top-end overhaul parts
- Complete overhaul requirements
- Genuine parts
- OEM parts
- Replacement parts
- Applicable Reman parts
For the related four-cylinder engine, visit our Caterpillar 3304 Marine Engine Parts page.
You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits, Caterpillar Engine Parts Catalogue and Marine Spare Parts Catalogue.
Alfa Marine Spare Parts is an independent marine spare-parts supplier and is not an official Caterpillar dealer.
Frequently Asked QuestionsIs the Caterpillar 3306 a Marine Engine?
Yes. Caterpillar maintains a dedicated 3306 Marine Engine equipment record, and current Caterpillar parts compatibility records explicitly list the 3306 under Marine Engine applications.
How Many Cylinders Does the Caterpillar 3306 Have?
The Caterpillar 3306 is an inline six-cylinder four-stroke diesel engine.
What Is the Caterpillar 3306 Displacement?
The Caterpillar 3306 belongs to approximately the 10.5-litre displacement class.
Does the Caterpillar 3306 Use Mechanical Fuel Injection?
Legacy Caterpillar 3306 diesel configurations use mechanical fuel-injection equipment. Exact components depend on the individual engine arrangement.
Is the Caterpillar 3306 Turbocharged?
Applicable Caterpillar 3306 marine configurations use turbocharging. Turbocharger specification should be verified against the individual engine.
Is the Caterpillar 3306 the Same as the 3306B?
No. They are closely related 3300 Series engines, but should be treated as separate models for parts identification.
Can Some Caterpillar 3306 and 3306B Parts Be the Same?
Yes. Caterpillar currently lists some components as compatible with both marine models.
However, this does not mean all parts are interchangeable.
Can You Supply Caterpillar 3306 Fuel Injection Parts?
Yes. We can assist with applicable fuel injectors, nozzles, injection-pump components, transfer pumps, governor parts and other fuel-system requirements.
Can You Supply Caterpillar 3306 Cylinder Liners and Pistons?
Yes. Depending on engine arrangement and availability, we can assist with cylinder liners, pistons, piston rings, pins and associated overhaul components.
Can You Supply Caterpillar 3306 Turbochargers?
Yes. We can assist with applicable new, replacement and Reman turbocharger requirements.
Provide the engine serial number and existing turbocharger number for correct identification.
Can You Supply Caterpillar 3306 Sea Water Pumps?
Yes. We can assist with applicable sea water pumps and other marine cooling-system components.
Provide the engine serial number and existing pump number whenever available.
Can You Supply Caterpillar 3306 Overhaul Parts?
Yes. Depending on availability, we can assist with pistons, rings, liners, bearings, cylinder-head components, fuel-system parts, turbochargers, cooling components, gaskets, seals and other overhaul requirements.
Related Caterpillar Engine Pages
Caterpillar 3304 Marine Engine Parts
Caterpillar 3304B Marine Engine Parts
Caterpillar 3116 Marine Engine Parts
Caterpillar 3126 Marine Engine Parts
Caterpillar 3208 Marine Engine Parts
Caterpillar 3406 Marine Engine Parts
Caterpillar 3408 Marine Engine Parts
Caterpillar 3412 Marine Engine Parts
Caterpillar Marine Engine Parts & Rebuild Kits
Caterpillar Engine Parts Catalogue
Request Caterpillar 3306 Marine Engine Parts
Looking for Caterpillar 3306 marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: Caterpillar 3306
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing part number:
Part description:
Quantity:
Required condition: Genuine / OEM / Replacement / Reman where applicable
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 Caterpillar Marine Engine Parts & Rebuild Kits.
Worldwide supply of Caterpillar 3306 parts for commercial vessels, fishing vessels, workboats, shipyards, marine repair companies and engine rebuilders.