Caterpillar 3126B Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Caterpillar 3126B marine engine parts and spares for commercial vessels, workboats, fishing vessels, yachts, propulsion systems and other marine applications.
We source genuine, OEM, replacement and applicable Reman Caterpillar 3126B parts, subject to availability, for scheduled maintenance, corrective repairs, top-end overhaul and complete engine rebuild requirements.
Our sourcing capabilities cover fuel injectors, fuel-system components, cylinder heads, pistons, piston rings, internal engine components, connecting rods, bearings, turbochargers, aftercooler parts, sea water pumps, jacket-water pumps, heat exchangers, oil pumps, oil coolers, electronic control components, sensors, starters, alternators, gaskets, seals and overhaul parts.
The Caterpillar 3126B is a 7.2-litre-class inline six-cylinder diesel engine produced in marine and other application configurations.
For the related engine generation, visit our Caterpillar 3126 Marine Engine Parts page.
You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits page.
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 3126B component? Request a Quote or email request@alfamarinespareparts.com.
Caterpillar 3126B Marine Engine Overview
The Caterpillar 3126B is an inline six-cylinder four-stroke diesel engine with approximately 7.2 litres of displacement.
Marine versions were developed for vessel applications and remain in service in commercial craft, workboats, fishing vessels, yachts and recreational boats.
The 3126B uses electronically controlled engine and fuel-system technology, with individual components depending on the engine arrangement and production configuration.
Caterpillar produced the 3126B across multiple applications, ratings and configurations.
Individual engines can therefore differ according to:
- Engine serial number
- Serial-number prefix
- Arrangement number
- Marine rating
- Rated engine speed
- Fuel-system configuration
- Turbocharger arrangement
- Aftercooler arrangement
- Cooling-system configuration
- Electronic controls
- Vessel installation
- Production revision
Replacement components should therefore always be identified against the individual engine.
Caterpillar 3126B Technical OverviewSpecificationCaterpillar 3126B MarineManufacturerCaterpillarEngine model3126BEngine type4-stroke dieselCylinder configurationInline 6Number of cylinders6DisplacementApprox. 7.2 LFuel systemElectronically controlled, configuration dependentAspirationTurbocharged / aftercooled on applicable configurationsEngine controlElectronicCoolingMarine configuration dependentApplicationsMarine propulsion and vessel applicationsParts identificationSerial number and arrangement dependent
Exact output, rated speed, turbocharger, cooling equipment and other specifications vary according to the individual 3126B marine configuration.
Caterpillar 3126B Marine Engine Parts
Alfa Marine Spare Parts can assist with a broad selection of Caterpillar 3126B engine parts for maintenance, repair and overhaul requirements.
Parts categories include:
- Cylinder components
- Internal engine parts
- Fuel-system components
- Fuel injectors
- Turbochargers
- Aftercooler components
- Cooling-system parts
- Lubrication-system parts
- Electronic components
- Electrical parts
- Gaskets and seals
- Maintenance parts
- Overhaul components
You can also browse our Marine Spare Parts Catalogue.
Caterpillar 3126B Cylinder Head Parts
Cylinder-head requirements can include:
- Complete cylinder heads
- Reman cylinder heads
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker components
- Injector-related components
- Cylinder-head sealing components
- O-rings
- Seals
- Fasteners
Applicable Caterpillar Reman cylinder-head assemblies are available for selected 3126B marine configurations.
Always verify compatibility using the engine serial number and existing component number.
Caterpillar 3126B Pistons & Internal Engine Parts
Internal engine requirements can include:
- Pistons
- Piston rings
- Piston pins
- Connecting rods
- Connecting-rod bushings
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft components
- Camshaft components
- Timing components
- Gaskets
- O-rings
- Seals
Major internal components should always be checked against the complete engine arrangement.
Caterpillar 3126B Fuel System Parts
The 3126B uses electronically controlled fuel-system technology.
Fuel-system requirements can include:
- Fuel injectors
- Injector components
- Injector seals
- Fuel transfer pumps
- Fuel priming components
- Fuel filters
- Fuel-water separators
- Fuel pressure components
- Fuel lines
- Fuel fittings
- Electronic control components
- Sensors
- Wiring
- Connectors
- Fuel-system gaskets
Fuel-system components can vary according to engine serial number and configuration.
Caterpillar 3126B Fuel Injectors
For Caterpillar 3126B injector requirements, provide:
Engine model: Caterpillar 3126B
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing injector part number:
Quantity:
This information helps identify the correct injector specification and applicable superseded or Reman part number.
Caterpillar 3126B Turbocharger Parts
Turbocharger requirements can include:
- Complete turbochargers
- Reman turbochargers
- Turbocharger cartridges
- Compressor components
- Turbine components
- Bearings
- Seals
- Water-cooling components
- Oil-feed components
- Oil-return components
- Intake connections
- Exhaust connections
- Mounting gaskets
Caterpillar currently identifies 0R-0964 as a Reman turbocharger compatible with the 3126B Marine Engine, with 164-9400 shown as an alternate water-cooled turbocharger.
Because turbocharger arrangements can differ, do not select a turbocharger using the 3126B model designation alone.
Provide:
Engine Serial Number + Existing Turbocharger NumberCaterpillar 3126B Aftercooler Parts
Applicable aftercooled 3126B marine configurations can require:
- Aftercooler assemblies
- Aftercooler cores
- Housings
- End covers
- Gaskets
- O-rings
- Seals
- Air connections
- Cooling connections
- Mounting components
The exact aftercooler arrangement should be checked against the individual engine.
Caterpillar 3126B Cooling System Parts
Marine cooling-system requirements can include:
- Sea water pumps
- Raw-water pumps
- Jacket-water pumps
- Heat exchangers
- Aftercoolers
- Oil coolers
- Thermostats
- Expansion-tank components
- Cooling pipes
- Hoses
- Pump shafts
- Mechanical seals
- Bearings
- Gaskets
- O-rings
Marine cooling arrangements can differ from industrial and other 3126B applications.
Always specify that the engine is a 3126B Marine Engine when requesting cooling components.
Caterpillar 3126B Sea Water Pump Parts
Applicable 3126B marine installations can require:
- Complete sea water pumps
- Raw-water pumps
- Pump housings
- Pump shafts
- 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 configuration
- Vessel installation
Do not assume every Caterpillar 3126B uses the same sea water pump.
Caterpillar 3126B 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
Heat exchanger components should be matched to the individual engine and cooling-system arrangement.
Caterpillar 3126B Oil Pump & Lubrication Parts
Lubrication-system requirements can include:
- Engine oil pumps
- Oil filters
- Oil coolers
- Oil-pressure regulators
- Oil-pressure sensors
- Oil lines
- Oil-pan components
- Crankshaft seals
- Gaskets
- O-rings
Correct lubrication-system components should be selected according to the engine serial number and arrangement.
Caterpillar 3126B 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
For major internal-engine requirements, provide:
Engine Serial Number + Arrangement Number + Existing Part NumberCaterpillar 3126B Camshaft & Timing Parts
Timing-system requirements can include:
- Camshafts
- Camshaft bearings
- Camshaft gears
- Timing gears
- Gear-train components
- Covers
- Bushings
- Fasteners
- Gaskets
- Seals
Correct components should be identified against the individual engine arrangement.
Caterpillar 3126B Electronic Control Parts
Electronic components are an important difference between the 3126B and earlier mechanical diesel platforms.
Requirements can include:
- Electronic control modules
- Engine sensors
- Pressure sensors
- Temperature sensors
- Speed sensors
- Wiring harnesses
- Connectors
- Engine monitoring components
- Electronic control components
Electronic components should always be identified using:
Engine Serial Number + Existing Electronic Component NumberCaterpillar 3126B Starter & Alternator Parts
Electrical requirements can include:
- Starter motors
- Starter solenoids
- Alternators
- Charging-system components
- Sensors
- Switches
- Wiring
- Connectors
- Monitoring components
Before ordering, verify:
- Engine serial number
- Existing part number
- System voltage
- Mounting arrangement
- Electrical connections
Caterpillar 3126B Gaskets & Seals
Gasket and sealing requirements can include:
- Cylinder-head sealing components
- Rocker-cover gaskets
- Intake-manifold gaskets
- Exhaust-manifold gaskets
- Turbocharger gaskets
- Oil-pan gaskets
- Water-pump gaskets
- Crankshaft seals
- Oil seals
- Injector seals
- O-rings
Complete gasket requirements can also be prepared together with associated overhaul components.
Caterpillar 3126B Overhaul Parts
For a Caterpillar 3126B engine overhaul, Alfa Marine Spare Parts can assist with applicable:
- Pistons
- Piston rings
- Piston pins
- Cylinder components
- Cylinder heads
- Intake valves
- Exhaust valves
- Connecting rods
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft parts
- Camshaft parts
- Fuel injectors
- Turbocharger components
- Cooling-system parts
- Oil pumps
- Oil cooler components
- Electronic components
- Gaskets
- O-rings
- Seals
For major overhaul requirements, send the complete engine identification and required parts list.
Caterpillar 3126B Top-End Overhaul Parts
Top-end overhaul requirements can include:
- Cylinder heads
- Intake valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker components
- Fuel injectors
- Injector seals
- Cylinder-head sealing components
- O-rings
- Seals
The exact overhaul scope should be determined according to engine condition, service history and inspection results.
Caterpillar 3126B Reman Parts
Caterpillar continues to support the 3126B platform with selected Reman components.
Depending on the engine configuration, applicable Reman options can include:
- Cylinder heads
- Turbochargers
- Electronic components
- Fuel-system components
- Starters
- Alternators
- Engine components
For example, Caterpillar currently lists 10R-8880 as a Reman cylinder-head assembly compatible specifically with 3126B and C7 Marine Engines.
Caterpillar also lists 0R-0964 as a Reman turbocharger for 3126B and C7 marine applications.
Reman compatibility should always be verified against:
3126B + Engine Serial Number + Existing Part NumberCaterpillar 3126B Marine Applications
The Caterpillar 3126B has a documented dedicated marine-engine application.
Depending on engine configuration and vessel installation, the 3126B can be found in:
- Marine propulsion
- Commercial vessels
- Workboats
- Fishing vessels
- Recreational boats
- Yachts
- Other marine installations
Because Caterpillar also produced the 3126B for non-marine applications, always specify 3126B Marine Engine when requesting replacement components.
Caterpillar 3126 vs 3126B
The Caterpillar 3126 and 3126B should be treated as separate engine models.
Although closely related, differences can affect:
- Fuel-system components
- Fuel injectors
- Electronic controls
- Sensors
- Turbochargers
- Cooling-system components
- Internal engine parts
- Wiring
- Gaskets
- Marine accessories
Caterpillar maintains a dedicated 3126B Marine Engine parts catalogue and parts diagram, separate from its 3126 Marine Engine catalogue.
For the previous engine generation, visit our Caterpillar 3126 Marine Engine Parts page.
Caterpillar 3126B vs C7
The Caterpillar 3126B and C7 are related engine platforms, and some Caterpillar components are documented for both marine engines.
However, this does not mean all 3126B and C7 components are interchangeable.
Differences can exist in:
- Engine controls
- Fuel-system components
- Sensors
- Turbocharger arrangements
- Cooling components
- Internal parts
- Production revisions
Always identify replacement components against the exact engine serial number.
Caterpillar 3126B Parts Identification
Correct identification is particularly important because the 3126B was produced in marine and non-marine configurations.
When requesting parts, provide:
Engine model: Caterpillar 3126B
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing part number:
Part description:
Quantity:
For turbochargers, pumps, injectors, ECMs, starters and alternators, photographs of the existing component can also assist with identification.
The preferred identification sequence is:
Caterpillar 3126B Marine + Engine Serial Number + Arrangement Number + Existing Part NumberWhy Source Caterpillar 3126B Parts From Alfa Marine Spare Parts?
Alfa Marine Spare Parts supports shipowners, yacht operators, ship managers, shipyards, marine engineers, purchasing departments, repair companies and engine rebuilders with Caterpillar 3126B marine engine parts and spares.
Depending on availability, we can assist with:
- Maintenance parts
- Fuel injectors
- Fuel-system components
- Electronic-control parts
- Cylinder components
- Internal engine parts
- Turbochargers
- Aftercooler components
- Cooling-system parts
- Sea water pumps
- Heat exchanger parts
- Lubrication-system components
- Electrical components
- Top-end overhaul parts
- Complete overhaul requirements
- Genuine parts
- OEM parts
- Replacement parts
- Applicable Reman parts
For the previous engine generation, visit our Caterpillar 3126 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 3126B a Marine Engine?
Yes. Caterpillar maintains a dedicated 3126B Marine Engine equipment catalogue, parts catalogue and parts diagrams.
Is the Caterpillar 3126B an Inline Six-Cylinder Engine?
Yes. The Caterpillar 3126B is an inline six-cylinder four-stroke diesel engine.
What Is the Caterpillar 3126B Displacement?
The Caterpillar 3126B belongs to approximately the 7.2-litre displacement class.
Is the Caterpillar 3126B Turbocharged?
Yes, applicable marine configurations use turbocharging and aftercooling depending on engine arrangement.
Does the Caterpillar 3126B Use Electronic Engine Control?
Yes. The 3126B uses electronically controlled engine and fuel-system technology.
Is the 3126B the Same as the 3126?
No.
The engines are closely related but should be treated as separate models for parts identification.
Can You Supply Caterpillar 3126B Fuel Injectors?
Yes. We can assist with applicable fuel injectors and related fuel-system components, subject to correct identification and availability.
Can You Supply Caterpillar 3126B Turbochargers?
Yes. We can assist with applicable new, OEM, replacement and Reman turbocharger requirements.
Caterpillar currently identifies 0R-0964 as a Reman turbocharger compatible with the 3126B Marine Engine.
Can You Supply Caterpillar 3126B Cylinder Heads?
Yes. We can assist with applicable new, replacement and Reman cylinder-head requirements.
Caterpillar currently identifies 10R-8880 as a Reman cylinder-head assembly compatible with the 3126B Marine Engine.
Can You Supply Caterpillar 3126B Sea Water Pumps?
Yes. We can assist with applicable sea water pumps and related cooling-system components.
Provide the engine serial number and existing pump number whenever available.
Can You Supply Caterpillar 3126B Overhaul Parts?
Yes. Depending on availability, we can assist with pistons, rings, bearings, cylinder-head components, injectors, turbochargers, cooling-system parts, gaskets, seals and other overhaul requirements.
Related Caterpillar Engine Pages
Caterpillar 3116 Marine Engine Parts
Caterpillar 3126 Marine Engine Parts
Caterpillar 3208 Marine Engine Parts
Caterpillar C7 Marine Engine Parts
Caterpillar C9 Marine Engine Parts
Caterpillar C18 Marine Engine Parts
Caterpillar Marine Engine Parts & Rebuild Kits
Caterpillar Engine Parts Catalogue
Request Caterpillar 3126B Marine Engine Parts
Looking for Caterpillar 3126B marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: Caterpillar 3126B
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 generation, visit our Caterpillar 3126 Marine Engine Parts page.
You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits.
Worldwide supply of Caterpillar 3126B parts for commercial vessels, workboats, fishing vessels, yachts, shipyards, marine repair companies and engine rebuilders.