Caterpillar 3126 Marine Engine Parts & Spares
Alfa Marine Spare Parts supplies Caterpillar 3126 marine engine parts and spares for commercial vessels, workboats, fishing vessels, yachts, propulsion systems, auxiliary installations and marine power applications.
We source genuine, OEM, replacement and applicable Reman Caterpillar 3126 parts, subject to availability, for scheduled maintenance, corrective repairs, top-end overhaul and complete engine rebuild requirements.
Our sourcing capabilities cover fuel-system components, injectors, cylinder heads, pistons, piston rings, cylinder components, connecting rods, bearings, turbochargers, aftercooler parts, sea water pumps, jacket-water pumps, heat exchangers, oil pumps, oil coolers, starters, alternators, sensors, gaskets, seals and overhaul components.
Caterpillar continues to maintain a dedicated parts catalogue and parts diagrams for the 3126 Marine Engine.
For other Caterpillar engines, visit 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 3126 component? Request a Quote or email request@alfamarinespareparts.com.
Caterpillar 3126 Marine Engine Overview
The Caterpillar 3126 is an inline six-cylinder four-stroke diesel engine produced in marine as well as industrial and equipment configurations.
Marine versions were used in propulsion and other vessel applications and remain in service in commercial vessels, workboats, fishing boats and recreational marine installations.
Caterpillar's current Parts Store continues to classify the 3126 Marine Engine as a dedicated marine application, with parts identification supported by engine serial number.
The 3126 was produced in multiple engine arrangements, ratings and marine configurations.
Individual engines can therefore differ according to:
- Engine serial number
- Serial-number prefix
- Arrangement number
- Engine rating
- Rated engine speed
- Turbocharger configuration
- Aftercooler configuration
- Fuel-system arrangement
- Cooling-system arrangement
- Marine accessory equipment
- Production revision
For this reason, replacement components should never be selected solely from the 3126 model designation.
Caterpillar 3126 Technical OverviewSpecificationCaterpillar 3126 MarineManufacturerCaterpillarEngine model3126Engine type4-stroke dieselCylinder configurationInline 6Number of cylinders6Displacement classApprox. 7.2 LAspirationTurbocharged / aftercooled on applicable configurationsFuel systemElectronically controlled, configuration dependentCooling systemMarine configuration dependentApplicationsMarine propulsion and other marine applicationsParts identificationSerial number and arrangement dependent
Exact output, engine speed, turbocharger arrangement, fuel-system components and cooling equipment vary according to the individual engine configuration.
Caterpillar 3126 Marine Engine Parts
Alfa Marine Spare Parts can assist with a broad selection of Caterpillar 3126 engine parts for routine service, corrective maintenance and complete engine overhaul requirements.
Parts requirements can include:
- Internal-engine components
- Cylinder components
- Fuel-system parts
- Turbocharger components
- Cooling-system parts
- Lubrication-system components
- Electrical parts
- Sensors
- Gaskets and seals
- Maintenance components
- Overhaul parts
You can also browse our Marine Spare Parts Catalogue.
Caterpillar 3126 Cylinder Head Parts
Cylinder-head requirements can include:
- Complete 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
For top-end overhaul or cylinder-head repairs, provide the complete engine serial number and existing part numbers whenever possible.
Caterpillar 3126 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 parts
- Camshaft parts
- Timing components
- Gaskets
- O-rings
- Seals
Major internal components should always be verified against the individual engine arrangement.
Caterpillar 3126 Fuel System Parts
Fuel-system requirements can include:
- Fuel injectors
- Injector components
- Fuel transfer pumps
- Fuel priming components
- Fuel filters
- Fuel-water separator components
- Fuel pressure components
- Fuel lines
- Fuel fittings
- Sensors
- Wiring
- Connectors
- Injector seals
- Fuel-system gaskets
Because different 3126 configurations can use different fuel-system components, the engine serial number is essential for correct identification.
Caterpillar 3126 Fuel Injectors
For Caterpillar 3126 injector requirements, provide:
Engine model: Caterpillar 3126
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing injector part number:
Quantity:
Do not select injectors using the 3126 model name alone.
Caterpillar 3126 Turbocharger Parts
Applicable Caterpillar 3126 marine configurations use turbocharging and, depending on engine version, aftercooling.
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
Correct turbocharger selection depends on the engine rating and arrangement.
For identification, provide:
Engine Serial Number + Existing Turbocharger NumberCaterpillar 3126 Aftercooler Parts
Applicable aftercooled 3126 marine engines can require:
- Aftercooler assemblies
- Aftercooler cores
- Housings
- End covers
- Gaskets
- O-rings
- Seals
- Cooling connections
- Air connections
- Mounting components
The exact aftercooler arrangement should always be checked against the individual marine installation.
Caterpillar 3126 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 substantially from industrial or equipment versions of the 3126.
Always identify cooling-system parts against the 3126 Marine Engine serial number and existing component number.
Caterpillar 3126 Sea Water Pump Parts
For applicable Caterpillar 3126 marine installations, we can assist with:
- Complete sea water pumps
- Raw-water pumps
- Pump shafts
- Mechanical seals
- Bearings
- Pump covers
- Pump housings
- 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
- Connection arrangement
Do not assume every 3126 marine engine uses the same raw-water pump.
Caterpillar 3126 Heat Exchanger Parts
Applicable marine cooling arrangements can require:
- Heat exchanger assemblies
- Heat exchanger cores
- End covers
- Gaskets
- O-rings
- Seals
- Cooling connections
- Mounting components
The heat exchanger should be matched to the individual engine and cooling-system arrangement.
Caterpillar 3126 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 is essential for protecting the crankshaft, bearings, pistons, camshaft and turbocharger.
Caterpillar 3126 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 3126 Camshaft & Timing Parts
Timing-system requirements can include:
- Camshafts
- Camshaft bearings
- Camshaft gears
- Timing gears
- Gear-train components
- Covers
- Bushings
- Fasteners
- Gaskets
- Seals
Parts should be identified using the complete engine arrangement.
Caterpillar 3126 Electrical & Electronic Parts
Depending on configuration, electrical and electronic requirements can include:
- Electronic control modules
- Engine sensors
- Temperature sensors
- Pressure sensors
- Speed sensors
- Wiring harnesses
- Connectors
- Starter motors
- Starter solenoids
- Alternators
- Charging-system parts
- Monitoring components
Electronic components should always be identified using the engine serial number and existing component number.
Caterpillar 3126 Starter & Alternator Parts
Before ordering electrical starting or charging components, verify:
- Engine serial number
- Existing part number
- System voltage
- Mounting arrangement
- Electrical connections
This is especially important on older marine installations where accessories may have been changed during the vessel's service life.
Caterpillar 3126 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 sealing requirements can also be prepared together with associated overhaul parts.
Caterpillar 3126 Overhaul Parts
For a Caterpillar 3126 engine overhaul, Alfa Marine Spare Parts can assist with applicable:
- Pistons
- Piston rings
- Piston pins
- Cylinder components
- Cylinder-head parts
- Intake valves
- Exhaust valves
- Connecting rods
- Main bearings
- Connecting-rod bearings
- Thrust components
- Crankshaft parts
- Camshaft parts
- Fuel injectors
- Turbocharger components
- Cooling-system components
- Oil pumps
- Oil cooler parts
- Gaskets
- O-rings
- Seals
For major overhaul enquiries, send the complete engine identification together with the required parts list.
Caterpillar 3126 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 seals
- Head sealing components
- O-rings
- Seals
The exact overhaul scope should be determined according to engine condition, operating history and inspection results.
Caterpillar 3126 Reman Parts
Applicable Caterpillar Reman components remain available for selected 3126 engine requirements.
Caterpillar currently lists, for example, a 10R-1820 Reman 3126 Short Block and 20R-1900 Reman 3126 Engine, demonstrating ongoing Reman support for the 3126 platform.
Depending on configuration and availability, Reman requirements can include:
- Short blocks
- Complete engines
- Turbochargers
- Fuel-system components
- Starters
- Alternators
- Other major engine components
Reman compatibility should always be checked against:
Caterpillar 3126 + Engine Serial Number + Existing Part NumberCaterpillar 3126 Marine Applications
Caterpillar has a documented dedicated 3126 Marine Engine application.
Depending on configuration, 3126 marine engines have been used in:
- Marine propulsion
- Commercial vessels
- Workboats
- Fishing vessels
- Recreational boats
- Yachts
- Other marine installations
Because the 3126 was also produced for industrial and other applications, always specify Marine Engine when requesting replacement parts.
Caterpillar 3126 vs 3126B
The Caterpillar 3126 and 3126B should be listed separately.
Caterpillar's current Parts Store maintains separate marine equipment catalogues for the 3126 Marine Engine and the 3126B Marine Engine, confirming that they should not simply be grouped as one model.
Differences can affect:
- Fuel-system components
- Injectors
- Electronic controls
- Sensors
- Turbochargers
- Cooling-system parts
- Internal-engine components
- Wiring
- Gaskets
- Marine accessories
Do not assume interchangeability between 3126 and 3126B parts.
Caterpillar 3116 vs 3126
The Caterpillar 3116 and 3126 are related inline six-cylinder diesel platforms, but they are separate engine models.
Replacement parts should not automatically be considered interchangeable.
Differences can exist in:
- Engine displacement
- Internal components
- Fuel systems
- Turbochargers
- Cooling components
- Electronics
- Marine accessories
Always identify parts against the exact engine.
Caterpillar 3126 Parts Identification
Correct identification is particularly important because the Caterpillar 3126 was produced in multiple applications and configurations.
When requesting parts, provide:
Engine model: Caterpillar 3126
Application: Marine
Engine serial number:
Serial-number prefix:
Arrangement number:
Existing part number:
Part description:
Quantity:
For turbochargers, pumps, electronic modules, starters and alternators, clear photographs can also assist with identification.
The preferred identification sequence is:
Caterpillar 3126 Marine + Engine Serial Number + Arrangement Number + Existing Part NumberWhy Source Caterpillar 3126 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 3126 marine engine parts and spares.
Depending on availability, we can assist with:
- Routine maintenance parts
- Fuel-system components
- Fuel injectors
- Electronic parts
- Cylinder components
- Internal-engine parts
- Turbocharger components
- Aftercooler parts
- Cooling-system components
- Sea water pumps
- Heat exchanger components
- Lubrication-system parts
- Electrical components
- Top-end overhaul parts
- Complete overhaul requirements
- Genuine parts
- OEM parts
- Replacement parts
- Applicable Reman parts
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 3126 a Marine Engine?
Yes. Caterpillar maintains a dedicated 3126 Marine Engine parts catalogue, equipment dashboard and parts diagrams.
Is the Caterpillar 3126 an Inline Six?
Yes. The 3126 is an inline six-cylinder four-stroke diesel engine.
What Is the Caterpillar 3126 Displacement?
The Caterpillar 3126 belongs to approximately the 7.2-litre displacement class.
Is the Caterpillar 3126 Turbocharged?
Applicable marine configurations are turbocharged, with aftercooling used on applicable engine versions.
Is the 3126 the Same as the 3126B?
No.
Caterpillar lists the 3126 and 3126B as separate Marine Engine equipment records, so they should be treated as separate models for parts identification.
Can You Supply Caterpillar 3126 Fuel Injectors?
Yes. We can assist with applicable fuel injectors and related fuel-system parts, subject to correct engine identification and availability.
Can You Supply Caterpillar 3126 Turbochargers?
Yes. We can assist with applicable turbocharger requirements.
Provide the engine serial number and existing turbocharger number whenever available.
Can You Supply Caterpillar 3126 Sea Water Pumps?
Yes. We can assist with applicable 3126 marine sea water pumps and related cooling-system components.
Provide the engine serial number and existing pump number for accurate identification.
Can You Supply Caterpillar 3126 Overhaul Parts?
Yes. Depending on availability, we can assist with pistons, rings, bearings, cylinder-head components, fuel-system parts, turbocharger components, cooling parts, gaskets, seals and other overhaul requirements.
Are 3116 and 3126 Parts Interchangeable?
Not automatically.
Always verify components using the complete engine model, serial number and existing part number.
Related Caterpillar Engine Pages
Caterpillar 3116 Marine Engine Parts
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Caterpillar 3400 Series Marine Engine Parts
Caterpillar 3406 Marine Engine Parts
Caterpillar 3412 Marine Engine Parts
Caterpillar C18 Marine Engine Parts
Caterpillar C32 Marine Engine Parts
Caterpillar Marine Engine Parts & Rebuild Kits
Caterpillar Engine Parts Catalogue
Request Caterpillar 3126 Marine Engine Parts
Looking for Caterpillar 3126 marine engine parts, maintenance spares or overhaul components?
Send us:
Engine model: Caterpillar 3126
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 3126 parts for commercial vessels, workboats, fishing vessels, yachts, shipyards, marine repair companies and engine rebuilders.