Caterpillar 3306B Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Caterpillar 3306B 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 3306B parts, subject to availability, for scheduled maintenance, engine repairs, top-end overhaul and major engine rebuild requirements.
Our sourcing capabilities cover fuel injection pumps, 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 3306B is an inline six-cylinder four-stroke diesel engine from Caterpillar's long-running 3300 Series and has documented marine-engine applications.
For the related earlier engine, visit our Caterpillar 3306 Marine Engine Parts page.
You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits and 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 3306B component? Request a Quote or email request@alfamarinespareparts.com.
Caterpillar 3306B Marine Engine Overview
The Caterpillar 3306B is the six-cylinder member of Caterpillar's 3300 Series diesel-engine family.
The engine uses an inline six-cylinder, four-stroke diesel configuration and belongs to approximately the 10.5-litre displacement class.
Caterpillar produced the 3306B for marine and numerous other heavy-duty applications.
Individual 3306B engines can differ according to:
- Engine serial number
- Serial-number prefix
- Arrangement number
- Power rating
- Rated speed
- Aspiration
- Fuel-system specification
- Turbocharger arrangement
- Cooling-system configuration
- Marine installation
- Accessory equipment
- Production revision
Because the 3306B is a legacy engine with multiple configurations, replacement parts should always be identified against the individual engine.
Caterpillar 3306B Technical OverviewSpecificationCaterpillar 3306BManufacturerCaterpillarEngine model3306BEngine familyCaterpillar 3300 SeriesEngine type4-stroke dieselCylinder configurationInlineNumber of cylinders6Displacement classApprox. 10.5 LFuel systemMechanical, configuration dependentAspirationConfiguration dependentTurbochargingApplicable marine configurationsCoolingMarine configuration dependentApplicationsMarine and other heavy-duty applicationsParts identificationSerial number and arrangement dependent
Exact power, rated speed, aspiration, fuel equipment, turbocharger specification and cooling-system components depend on the individual 3306B arrangement.
For parts sourcing, use the engine serial number and arrangement number rather than selecting components from the 3306B model name alone.
Caterpillar 3306B Marine Engine Parts
Alfa Marine Spare Parts can assist with a broad selection of Caterpillar 3306B engine parts for routine service, corrective maintenance and planned overhaul work.
Parts categories include:
- Cylinder heads
- Cylinder-head components
- Pistons
- Piston rings
- Cylinder liners
- Connecting rods
- Crankshaft components
- Main bearings
- Connecting-rod bearings
- Fuel injection pumps
- Fuel injectors
- Injector nozzles
- Governor components
- Turbochargers
- Cooling-system components
- Lubrication-system parts
- Intake and exhaust components
- Starting-system components
- Alternators
- Gaskets and seals
- Overhaul components
You can also browse our Marine Spare Parts Catalogue.
Caterpillar 3306B 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 engine serial number and existing component numbers whenever available.
Caterpillar 3306B 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 especially important when preparing a complete Caterpillar 3306B overhaul.
Caterpillar 3306B Cylinder Liners
Cylinder-liner requirements can include:
- Cylinder liners
- Liner seals
- O-rings
- Pistons
- Piston rings
- Associated gaskets
- Overhaul components
For major overhaul requirements, provide the engine serial number together with existing piston and liner references whenever available.
Caterpillar 3306B Fuel Injection Parts
The Caterpillar 3306B uses mechanical diesel fuel-injection equipment, with exact components depending on the individual engine arrangement.
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
Caterpillar continues to list fuel-system components and Reman fuel-injection equipment with specific 3306B Marine Engine compatibility.
Caterpillar 3306B Fuel Injection Pump
Fuel injection pump requirements can include:
- Complete fuel injection pumps
- Reman fuel injection pumps
- Pump elements
- Plungers
- Barrels
- Delivery components
- Governor components
- Fuel-control components
- Seals
- Gaskets
- Related hardware
Applicable Caterpillar records include 20R-5285 Cat Reman Fuel Injection Pump, whose compatibility listing includes the 3306B Marine Engine.
Another Cat Reman fuel injection pump, 20R-5155, is also specifically listed for a 3306B Marine Engine application.
These references should not be considered universal for every 3306B.
Always verify the engine serial number and existing pump number before ordering.
Caterpillar 3306B Fuel Injectors
For Caterpillar 3306B injector requirements, provide:
Engine model: Caterpillar 3306B
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.
Caterpillar 3306B Turbocharger Parts
Applicable Caterpillar 3306B marine configurations use turbocharging.
Turbocharger requirements can include:
- Complete turbochargers
- Reman turbochargers
- Turbocharger cartridges
- Compressor components
- Turbine components
- Bearings
- Seals
- Oil-feed components
- Oil-return components
- Water connections where applicable
- Intake connections
- Exhaust connections
- Mounting gaskets
Caterpillar currently lists multiple turbocharger references with 3306B Marine Engine compatibility.
Examples include:
2W-3556 — Engine Turbocharger
2W-7276 — Turbocharger
110-3866 — Engine Turbocharger
Applicable Reman and cartridge alternatives also exist depending on the original turbocharger arrangement.
Because multiple turbocharger configurations exist, never select a turbocharger from the 3306B model designation alone.
Caterpillar 3306B Turbocharger Cartridge
Turbocharger cartridge requirements can include:
- Center housing assemblies
- Turbine and compressor components
- Bearings
- Shaft components
- Seals
- Complete cartridge assemblies
Caterpillar currently lists:
2W-3558 — Turbocharger Cartridge
with compatibility for both the 3306 and 3306B Marine Engines.
The corresponding 0R-6797 Cat Reman Turbocharger Cartridge is also listed for these marine applications.
Always confirm the original turbocharger number before selecting a cartridge.
Caterpillar 3306B 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 substantially from industrial and generator versions of the 3306B.
Always specify 3306B Marine Engine when requesting cooling-system components.
Caterpillar 3306B 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 pump identification can depend on:
- Engine serial number
- Serial-number prefix
- Arrangement number
- Existing pump number
- Cooling-system configuration
- Vessel installation
If the existing part number is unavailable, provide clear photographs of the pump and engine identification plate.
Caterpillar 3306B 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 3306B 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 vessel's cooling arrangement should be considered when identifying heat-exchanger components.
Caterpillar 3306B 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-system components should be verified against the individual engine serial number and arrangement.
Caterpillar 3306B 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
Some crankshaft components are shared across applicable 3306 and 3306B configurations, while others require arrangement-specific verification.
For major internal-engine requirements, provide:
Engine Serial Number + Arrangement Number + Existing Part NumberCaterpillar 3306B 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 3306B Intake & Exhaust Parts
Intake and exhaust requirements can include:
- Intake manifolds
- Exhaust manifolds
- Air-intake components
- Turbocharger connections
- Exhaust elbows
- Exhaust connections
- Water-cooled components where applicable
- Gaskets
- Seals
- Clamps
- Mounting hardware
Marine intake and exhaust arrangements can vary according to the engine configuration and vessel installation.
Caterpillar 3306B Starter & Alternator Parts
Starting and electrical 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
Before ordering a starter or alternator, verify:
- Engine serial number
- Existing part number
- System voltage
- Starting arrangement
- Mounting configuration
Caterpillar 3306B 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 3306B Overhaul Parts
For a Caterpillar 3306B 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 pumps
- Governor components
- Turbochargers
- Turbocharger cartridges
- Cooling-system components
- Water pumps
- Oil pumps
- Oil cooler components
- Gaskets
- O-rings
- Seals
For complete overhaul requirements, send the engine identification together with the required parts list.
Caterpillar 3306B 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 3306B Reman Parts
Selected Caterpillar Reman components continue to be available for applicable 3306B configurations.
Examples can include:
- Fuel injection pumps
- Turbochargers
- Turbocharger cartridges
- Crankshaft components
- Starting-system components
- Other major engine parts
Examples with documented 3306B marine compatibility include:
20R-5285 — Cat Reman Fuel Injection Pump
20R-5155 — Cat Reman Fuel Injection Pump
20R-7013 — Cat Reman Turbocharger alternative for applicable 2W-3556 configurations
0R-6797 — Cat Reman Turbocharger Cartridge
These references are examples only.
Always verify:
3306B + Engine Serial Number + Arrangement Number + Existing Part Number
before ordering.
Caterpillar 3306B Marine Applications
Caterpillar maintains a dedicated 3306B Marine Engine equipment and parts catalogue.
Depending on engine configuration and vessel installation, legacy 3306B engines can be encountered in applications such as:
- Commercial vessels
- Fishing vessels
- Workboats
- Auxiliary installations
- Marine generator installations
- Other vessel machinery applications
Because Caterpillar also produced 3306B engines for industrial and other applications, always specify that the requirement is for a 3306B Marine Engine.
Caterpillar 3306 vs 3306B
The Caterpillar 3306 and Caterpillar 3306B are closely related but should be maintained as separate engine pages.
Both use:
- Inline six-cylinder architecture
- Four-stroke diesel operation
- Mechanical fuel-system configurations
- Heavy-duty 3300 Series architecture
However, differences can exist in:
- Fuel injection equipment
- Fuel injection pumps
- Governor components
- Cylinder-head components
- Pistons and internal parts
- Turbocharger arrangements
- Cooling-system components
- Gaskets and seals
- Accessory equipment
- Production revisions
Caterpillar records show that certain components fit both 3306 and 3306B marine engines.
For example, 2W-3556 turbocharger and 0R-6797 Reman turbocharger cartridge are listed for both models.
This does not mean all 3306 and 3306B parts are interchangeable.
For the related engine, visit our Caterpillar 3306 Marine Engine Parts page.
Caterpillar 3304B vs 3306B
Both engines belong to Caterpillar's 3300 Series, but they have different cylinder configurations.
Caterpillar 3304B — inline 4-cylinder
Caterpillar 3306B — inline 6-cylinder
This difference affects major components such as:
- Crankshaft
- Camshaft
- Cylinder components
- Fuel-system configuration
- Internal engine parts
- Gaskets
- Cooling requirements
- Overhaul components
For the four-cylinder model, visit our Caterpillar 3304B Marine Engine Parts page.
Caterpillar 3306B Parts Identification
Correct parts identification is especially important with legacy Caterpillar engines because individual engines may have been rebuilt, modified or fitted with superseded components during their operating life.
When requesting parts, provide:
Engine model: Caterpillar 3306B
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 3306B Marine + Engine Serial Number + Arrangement Number + Existing Part NumberWhy Source Caterpillar 3306B 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 3306B marine engine parts and spares.
Depending on availability, we can assist with:
- Maintenance parts
- Fuel injectors
- Fuel injection pumps
- Fuel-system components
- Cylinder-head components
- Pistons and cylinder liners
- Internal engine components
- Crankshaft components
- Turbochargers
- Turbocharger cartridges
- 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 engine, visit our Caterpillar 3306 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 3306B a Marine Engine?
Yes. Caterpillar maintains a dedicated 3306B Marine Engine parts catalogue and parts diagram.
How Many Cylinders Does the Caterpillar 3306B Have?
The Caterpillar 3306B is an inline six-cylinder four-stroke diesel engine.
What Is the Caterpillar 3306B Displacement?
The 3306B belongs to approximately the 10.5-litre displacement class.
Does the Caterpillar 3306B Use Mechanical Fuel Injection?
Yes. Legacy 3306B diesel configurations use mechanical fuel-injection equipment. Exact pump, injector and governor components depend on the engine arrangement.
Is the Caterpillar 3306B Turbocharged?
Applicable 3306B marine configurations use turbocharging. Caterpillar currently lists several turbocharger references with specific 3306B Marine Engine compatibility.
Is the Caterpillar 3306B the Same as the 3306?
No. They are closely related engines but should be treated as separate models for parts identification.
Are 3306 and 3306B Parts Interchangeable?
Some components are listed by Caterpillar for both engines, but this does not mean all parts are interchangeable.
Always verify the engine serial number, arrangement number and existing component number.
Can You Supply Caterpillar 3306B Fuel Injection Pumps?
Yes. We can assist with applicable new, replacement and Reman fuel injection pump requirements.
Can You Supply Caterpillar 3306B Turbochargers?
Yes. We can assist with applicable complete turbochargers, Reman turbochargers, cartridges and related components.
Can You Supply Caterpillar 3306B Cylinder Liners and Pistons?
Yes. Depending on configuration and availability, we can assist with liners, pistons, piston rings, pins and associated overhaul components.
Can You Supply Caterpillar 3306B 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 3306B 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 3306 Marine Engine Parts
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 3306B Marine Engine Parts
Looking for Caterpillar 3306B marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: Caterpillar 3306B
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
For the related engine, visit our Caterpillar 3306 Marine Engine Parts page.
You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits.
Worldwide supply of Caterpillar 3306B parts for commercial vessels, fishing vessels, workboats, shipyards, marine repair companies and engine rebuilders.