Different Types of Caterpillar 3412 Engines: 3412, 3412B, 3412C, 3412D & 3412E
The Caterpillar 3412 is one of the best-known V12 diesel engine platforms within Caterpillar's 3400 Series.
But there is an important point for vessel owners, engineers and parts buyers:
Not every CAT 3412 is the same engine.
Over the life of the Caterpillar 3412 family, different generations and configurations have appeared under designations including:
- Caterpillar 3412
- Caterpillar 3412B
- Caterpillar 3412C
- Caterpillar 3412D
- Caterpillar 3412E
They belong to the same wider engine lineage, but differences between generations can affect fuel systems, engine controls, governors, turbochargers, cooling arrangements, seawater pumps, sensors and other components.
This makes accurate engine identification particularly important when sourcing spare parts.
A request that only says:
“I need parts for a CAT 3412.”
may not contain enough information to determine the correct component.
For the original engine family, visit our Caterpillar 3412 Marine Engine Parts page.
You can also browse our dedicated Caterpillar 3412C Marine Engine Parts and Caterpillar 3412E Marine Engine Parts pages.
For the wider Caterpillar range, visit CAT Marine Engine Parts & Rebuild Kits.
Need a specific component? Request a Quote or email request@alfamarinespareparts.com.
What Is the Caterpillar 3412 Engine Family?
The Caterpillar 3412 belongs to Caterpillar's well-known 3400 Series of heavy-duty diesel engines.
The basic 3412 architecture is a large-displacement V12 four-stroke diesel engine.
Important dimensions associated with traditional 3412-family configurations include approximately:
| SpecificationCaterpillar 3412 Family | |
| Engine type | Four-stroke diesel |
| Cylinder configuration | V12 |
| V-angle | 65 degrees |
| Cylinder bore | Approx. 137.2 mm |
| Piston stroke | Approx. 152.4 mm |
| Displacement | Approx. 27 L |
| Combustion | Direct injection |
| Engine family | Caterpillar 3400 Series |
The 3412 platform has been used across marine propulsion, marine auxiliary, generator and industrial applications.
Its long production and application history is one reason so many different 3412 arrangements are still encountered today.
What Are the Different Types of Caterpillar 3412?
The important Caterpillar 3412 designations include:
| EngineConfigurationDisplacement ClassMain Identification Point | |||
| Caterpillar 3412 | V12 | Approx. 27 L | Original 3412 generation |
| Caterpillar 3412B | V12 | Approx. 27 L class | Intermediate 3412 generation |
| Caterpillar 3412C | V12 | Approx. 27 L | Widely used later generation |
| Caterpillar 3412D | V12 | Approx. 27 L class | Later documented 3412 variant |
| Caterpillar 3412E | V12 | Approx. 27 L | Electronic-control generation |
The suffix is important, but it should not be used alone for parts selection.
For replacement components, identify:
Complete engine model + engine serial number + serial-number prefix + arrangement number + existing part number
Caterpillar 3412
The original Caterpillar 3412 established the V12 architecture associated with the wider engine family.
Marine versions have been used for demanding propulsion and auxiliary duties across different types of vessels.
Applications can include:
- Commercial vessels
- Fishing vessels
- Workboats
- Tugboats
- Passenger vessels
- Offshore-support vessels
- Motor yachts
- Marine auxiliary systems
- Marine generator installations
Many Caterpillar 3412 engines have accumulated considerable operating hours, meaning maintenance and overhaul requirements are now common.
Typical replacement requirements can include:
- Pistons
- Piston rings
- Cylinder liners
- Cylinder heads
- Fuel-system components
- Fuel injectors
- Turbochargers
- Main bearings
- Connecting rod bearings
- Seawater pumps
- Jacket-water pumps
- Oil pumps
- Gaskets
- Seals
- Overhaul components
For specifications, maintenance information and available component categories, visit our dedicated Caterpillar 3412 Marine Engine Parts page.
Caterpillar 3412B
The Caterpillar 3412B is an important but less commonly discussed designation within the wider 3412 lineage.
Historical Caterpillar technical documentation identifies 3412B engine configurations, including marine applications.
This matters because some simplified lists of the Caterpillar 3400 Series move directly from the original 3412 to the 3412C.
The 3412B should not automatically be treated as another name for either engine.
Although it belongs to the same V12 family, parts identification should still be based on the actual engine serial number and arrangement.
Common requirements for older 3412B engines can include:
- Cylinder liners
- Pistons
- Piston rings
- Cylinder heads
- Valves
- Connecting rods
- Main bearings
- Connecting rod bearings
- Fuel-system components
- Fuel pumps
- Turbocharger components
- Cooling-system parts
- Water pumps
- Oil pumps
- Gaskets
- Seals
- Overhaul components
If the engine identification plate specifically states 3412B, include the B designation when requesting components.
Do not shorten the enquiry to simply:
CAT 3412
because doing so removes useful identification information.
Caterpillar 3412C
The Caterpillar 3412C became one of the best-known later generations of the 3412 family.
The engine retains the basic approximately 27-litre V12 architecture of the platform.
Important characteristics encountered on documented 3412C configurations include:
Engine type: Four-stroke diesel
Cylinder configuration: V12
Displacement: Approx. 27 L
Bore: Approx. 137.2 mm
Stroke: Approx. 152.4 mm
Aspiration: Turbocharged and aftercooled on applicable configurations
The 3412C was produced for more than one application.
Depending on configuration, it can be encountered in:
- Marine propulsion
- Marine auxiliary service
- Generator installations
- Industrial applications
This means that identifying an engine as simply a 3412C still does not necessarily provide enough information for every replacement component.
For complete engine information and component categories, visit our Caterpillar 3412C Marine Engine Parts page.
Caterpillar 3412C Marine Propulsion Engine
The Caterpillar 3412C has been widely encountered in marine propulsion applications.
Depending on the particular arrangement, systems can include:
- Turbocharging
- Aftercooling
- Mechanical fuel-control equipment
- Jacket-water cooling
- Seawater cooling
- Fuel injection equipment
- Lubrication-system components
- Water-cooled exhaust components
- Transmission cooling equipment
However, equipment can vary between different ratings and serial-number ranges.
This is why a turbocharger, seawater pump or fuel-system component should not be ordered from the 3412C name alone.
For dedicated parts information, use our Caterpillar 3412C Marine Engine Parts page.
Caterpillar 3412C Auxiliary & Generator Engines
The 3412C was not limited to main propulsion.
Applicable configurations have also been used for auxiliary and generator applications.
This introduces another identification factor.
When requesting components, specify whether the engine is used for:
Marine propulsion
Marine auxiliary service
Generator operation
or:
Industrial service
A 3412C propulsion engine and a 3412C generator engine can belong to the same basic engine family while having differences in rating, governing, cooling arrangements and accessory equipment.
Caterpillar 3412D
The Caterpillar 3412D is another documented member of the wider 3412 engine family.
It is encountered less frequently in general online engine catalogues than the 3412C or 3412E, but Caterpillar application information identifies 3412D configurations.
This model is especially relevant when identifying cooling-system components because certain Caterpillar seawater-pump references are documented for applicable 3412D Marine engines.
Do not automatically use a 3412C component simply because the two engines belong to the same V12 family.
Potential differences can affect:
- Fuel-system components
- Turbochargers
- Seawater pumps
- Jacket-water pumps
- Oil pumps
- Cooling-system equipment
- Exhaust components
- Engine accessories
- Gaskets
- Seals
For example, your exact engine arrangement matters when identifying a seawater pump.
Read our Caterpillar 3412 Seawater Pump Guide for applicable 3412D pump references.
Caterpillar 3412E
The Caterpillar 3412E represents an important later development of the Caterpillar 3412 platform.
One of the major distinctions compared with earlier 3412 generations is its electronic engine-control architecture.
That difference is particularly important when sourcing replacement components.
Depending on the engine arrangement, 3412E requirements can involve:
- Electronic engine-control components
- Engine sensors
- Wiring harnesses
- Fuel-system components
- Electronic actuators
- Engine monitoring components
- Turbochargers
- Cooling-system components
- Starting-system equipment
The 3412E therefore should not be described simply as a standard 3412 when requesting electronic, fuel or control-system components.
Always state:
Caterpillar 3412E
For specifications and parts categories, visit our dedicated Caterpillar 3412E Marine Engine Parts page.
Caterpillar 3412 vs 3412C vs 3412E
The original 3412, 3412C and 3412E belong to the same general V12 engine lineage, but there are important generation differences.
| Feature34123412C3412E | |||
| Configuration | V12 | V12 | V12 |
| Displacement class | Approx. 27 L | Approx. 27 L | Approx. 27 L |
| Engine generation | Earlier | Later | Later electronic |
| Turbocharged versions | Yes | Yes | Yes |
| Aftercooled versions | Application dependent | Yes on applicable versions | Yes on applicable versions |
| Control architecture | Earlier mechanical arrangements | Mechanical on applicable configurations | Electronic |
| Marine applications | Yes | Yes | Yes |
| Serial-number verification | Required | Required | Required |
The overall architecture may be related, but parts compatibility should never be assumed from this table.
The exact engine serial number and arrangement remain the controlling identification information.
Caterpillar 3412C vs 3412E
One of the most useful comparisons for marine operators is 3412C vs 3412E.
Both are V12 engines from the 3412 lineage and retain a similar displacement class.
The major practical difference is the development of the engine-control system.
Applicable 3412C marine propulsion configurations use mechanical control arrangements.
The 3412E belongs to the later electronically controlled generation.
That distinction can affect:
- Fuel-system components
- Engine controls
- Governors
- Sensors
- Wiring
- Electronic modules
- Actuators
- Diagnostic components
It can also affect the way technicians troubleshoot an engine.
For this reason, a request for:
“3412 fuel parts”
should always be clarified to determine whether the engine is a 3412, 3412C, 3412D or 3412E.
Visit our Caterpillar 3412C Marine Engine Parts and Caterpillar 3412E Marine Engine Parts pages for the individual engine generations.
Mechanical vs Electronic Caterpillar 3412 Engines
Another useful way to understand the 3412 family is by comparing mechanically controlled and electronically controlled generations.
Earlier configurations can use mechanical systems such as:
- Mechanical fuel-control equipment
- Fuel injection pumps
- Mechanical governors
- Control linkages
- Mechanical actuating components
Later electronic engines can add components such as:
- Electronic control modules
- Engine sensors
- Wiring harnesses
- Electronic actuators
- Electronic governing
- Electrical connectors
- Diagnostic components
The move toward electronic control is one of the reasons the 3412E requires more specific parts identification.
Do All Caterpillar 3412 Engines Use the Same Parts?
No.
This is one of the most important points when sourcing Caterpillar 3412 spare parts.
The 3412, 3412B, 3412C, 3412D and 3412E belong to the same broader family, but they should not automatically be treated as interchangeable.
Differences can exist in:
- Fuel injectors
- Fuel injection systems
- Fuel pumps
- Governors
- Turbochargers
- Aftercoolers
- Seawater pumps
- Jacket-water pumps
- Oil pumps
- Cylinder heads
- Pistons
- Cylinder liners
- Main bearings
- Connecting rod bearings
- Cooling-system components
- Exhaust components
- Sensors
- Wiring
- Electronic controls
- Gaskets
- Seals
Even two engines carrying the exact same 3412C or 3412E designation can have different components because of serial-number range, arrangement, rating or application.
Caterpillar 3412 Sea Water Pump Differences
The seawater-pump system provides a good real-world example of why 3412 generation and arrangement matter.
There is not one universal CAT 3412 seawater pump.
Important documented references for applicable 3412-family marine engines include:
| Part NumberSearch FormatApplicable Reference | ||
| 6I-1898 | 6I1898 | Selected 3412 / 3412D Marine |
| 197-4855 | 1974855 | Selected 3412 Marine |
| 7C-3613 | 7C3613 | Selected 3412 / 3412C / 3412D Marine |
| 0R-7722 | 0R7722 | Reman reference associated with applicable 6I-1898 applications |
| 0R-7731 | 0R7731 | Reman reference associated with applicable 197-4855 applications |
| 0R-7732 | 0R7732 | Reman seawater-pump reference for applicable 3412E Marine |
This is not an interchangeability table.
It is a reference showing why the exact engine arrangement must be checked.
A pump used on one 3412-family engine should not automatically be installed on another simply because the engines share the 3412 designation.
For a detailed technical explanation, read our Caterpillar 3412 Seawater Pumps – 6I-1898, 197-4855 & Reman Parts guide.
Caterpillar 3412 6I-1898 / 6I1898 Sea Water Pump
6I-1898 / 6I1898 is an auxiliary/seawater-pump group documented for applicable Caterpillar marine configurations including selected:
3412 Marine
and:
3412D Marine
An applicable Caterpillar Reman reference associated with this pump family is:
0R-7722 / 0R7722
The exact relationship should still be verified against the engine serial number and arrangement before ordering.
A strong enquiry would include:
Engine: Caterpillar 3412D
Existing pump: 6I-1898
Engine serial number: provided
Arrangement number: provided
That is much more useful than simply requesting:
“CAT 3412 seawater pump.”
Caterpillar 3412 197-4855 / 1974855 Sea Water Pump
Another important Caterpillar 3412 pump reference is:
197-4855 / 1974855
This auxiliary pump is documented for applicable Caterpillar 3412 Marine configurations.
An associated Caterpillar Reman reference is:
0R-7731 / 0R7731
If either part number appears on the existing pump or in the vessel's service records, include it when requesting a replacement.
Caterpillar 3412C & 3412D 7C-3613 / 7C3613
Another important auxiliary seawater-pump reference is:
7C-3613 / 7C3613
This reference appears across selected marine configurations including:
- Caterpillar 3412
- Caterpillar 3412C
- Caterpillar 3412D
That does not mean it fits every engine carrying those model names.
Always verify the engine serial number and arrangement.
For 3412C engine components beyond the cooling system, visit our Caterpillar 3412C Marine Engine Parts page.
Caterpillar 3412E Sea Water Pump
The Caterpillar 3412E should be treated separately when identifying seawater-pump requirements.
One Caterpillar Reman seawater-pump reference documented for applicable 3412E Marine applications is:
0R-7732 / 0R7732
Again, this should be treated as an application-specific reference rather than a universal pump for every 3412E.
If you have a 3412E, tell the parts supplier specifically:
Caterpillar 3412E Marine
and provide the complete engine identification.
For engine components, visit our Caterpillar 3412E Marine Engine Parts.
For pump information, read our Caterpillar 3412 Seawater Pump Guide.
What Happens When Caterpillar 3412 Seawater Flow Drops?
Cooling problems are common reasons operators start searching for a Caterpillar 3412 raw-water or seawater pump.
Possible symptoms can include:
- Higher coolant temperature under load
- Engine temperature increasing as RPM rises
- Temperature returning toward normal when load is reduced
- Reduced seawater discharge
- Increased exhaust-related temperatures
- Higher engine-room temperatures
However, these symptoms do not automatically prove that the pump itself has failed.
The complete seawater circuit should be investigated.
Possible causes can include:
- Restricted seawater inlet
- Blocked sea strainer
- Damaged pump components
- Worn pump housing
- Corrosion
- Cavitation
- Restricted heat exchanger
- Thermostat problems
- Cooling-system contamination
- Downstream restrictions
For a detailed explanation, read our Caterpillar 3412 Raw Water Pump: When Seawater Flow Drops guide.
Caterpillar 3412 Losing Power Under Load
Generation and component identification can also matter when diagnosing a Caterpillar 3412 that loses power under load.
Possible areas requiring investigation can include:
- Fuel filters
- Fuel supply
- Fuel injectors
- Turbocharger condition
- Air intake restriction
- Exhaust restriction
- Aftercooler condition
- Seawater flow
- Jacket-water temperature
- Engine load
- Propeller load
A problem that appears to be fuel related can sometimes originate elsewhere in the engine or vessel installation.
For more information, read our Caterpillar 3412 Marine Engine Losing Power Under Load guide.
Caterpillar 3412 Turbocharger Differences
Turbocharger requirements can also differ between 3412 generations and ratings.
A turbocharger fitted to an original 3412 should not automatically be assumed to fit a 3412C or 3412E.
Even within the same generation, turbocharger references can change according to:
- Power rating
- Rated RPM
- Engine arrangement
- Application
- Production revision
- Exhaust configuration
For example, specific turbocharger references are documented for applicable 3412E applications.
This reinforces the same identification rule:
Exact engine model + serial number + arrangement number + existing turbocharger number
should be provided whenever possible.
Caterpillar 3412 Marine Engine Parts
Alfa Marine Spare Parts can assist with replacement-component requirements for applicable Caterpillar 3412-family engines.
Depending on model, arrangement and availability, requirements can include the following categories.
Cylinder & Internal Engine Parts
- Pistons
- Piston rings
- Piston pins
- Cylinder liners
- Liner seals
- Connecting rods
- Main bearings
- Connecting rod bearings
- Thrust bearings
- Crankshaft components
- Camshaft components
- Bushings
- Timing components
Cylinder Head & Valve Parts
Requirements can include:
- Complete cylinder heads
- Inlet valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Rocker components
- Valve-train components
- Cylinder head gaskets
- Seals
Cylinder-head assemblies and individual components should always be identified against the exact engine generation.
Caterpillar 3412 Fuel System Parts
Fuel-system requirements can include:
- Fuel injectors
- Fuel injection components
- Fuel pumps
- Fuel transfer pumps
- Fuel filters
- Fuel filter housings
- Fuel lines
- Fuel-system seals
- Governor components
- Electronic fuel-control components on applicable engines
The difference between mechanical and electronic generations makes accurate model identification particularly important here.
Caterpillar 3412 Turbocharger Parts
Requirements can include:
- Complete turbochargers
- Caterpillar Reman turbochargers
- Turbocharger cartridges
- Turbine components
- Compressor components
- Bearings
- Seals
- Oil supply components
- Oil drain components
- Turbocharger gaskets
- Mounting hardware
Always provide the existing turbocharger part number whenever available.
Caterpillar 3412 Cooling System Parts
Cooling-system requirements can include:
- Sea water pumps
- Raw-water pumps
- Auxiliary water pumps
- Jacket-water pumps
- Heat exchangers
- Aftercooler components
- Oil coolers
- Thermostats
- Cooling pipes
- Hoses
- Gaskets
- Seals
- O-rings
For more detailed pump information, read our Caterpillar 3412 Seawater Pump Guide.
Caterpillar 3412 Lubrication Parts
Lubrication-system requirements can include:
- Engine oil pumps
- Oil filters
- Oil filter housings
- Oil coolers
- Oil pressure components
- Oil pipes
- Oil lines
- Crankshaft seals
- Gaskets
- O-rings
The correct oil-pump and cooler components should be checked against the exact engine arrangement.
Caterpillar 3412 Electrical & Control Parts
Electrical requirements become particularly important on later engine generations.
Depending on configuration, components can include:
- Sensors
- Switches
- Wiring
- Wiring harnesses
- Control modules
- Electronic actuators
- Solenoids
- Starting-system components
- Charging-system components
- Engine monitoring equipment
These components are particularly sensitive to engine-generation differences.
A 3412E electronic component should not be selected from a generic 3412 description.
For the electronic-generation engine page, visit Caterpillar 3412E Marine Engine Parts.
Caterpillar 3412 Overhaul Parts
Many Caterpillar 3412-family engines remain in commercial service after substantial operating hours.
Major overhaul requirements can include:
- 12 pistons
- Piston ring sets
- Cylinder liners
- Liner seal kits
- Piston pins
- Connecting rod bearings
- Main bearings
- Thrust bearings
- Cylinder heads
- Inlet valves
- Exhaust valves
- Fuel injectors
- Complete gasket sets
- Crankshaft seals
- Water pump components
- Oil pump components
- Turbochargers
- Aftercooler components
Because the 3412 is a V12, a complete overhaul represents a substantial parts requirement.
A complete overhaul list should not be prepared from the description:
“CAT 3412 V12”
alone.
Instead provide:
Exact model + complete engine serial number + serial-number prefix + arrangement number + required parts list
How Do I Know Which Caterpillar 3412 I Have?
Start with the engine identification plate.
Determine whether the engine is identified as:
Caterpillar 3412
Caterpillar 3412B
Caterpillar 3412C
Caterpillar 3412D
or:
Caterpillar 3412E
Then record:
Complete engine serial number
Serial-number prefix
Arrangement number
Rated power
Rated engine speed
Application
For a replacement component, also record the existing part number whenever possible.
If the part number cannot be read, clear photographs of the engine identification plate and existing component can help with identification.
Why the Caterpillar 3412 Serial Number Matters
Two Caterpillar 3412-family engines can look nearly identical and still use different components.
Likewise, two pumps, injectors or turbochargers may look similar externally while having different internal specifications.
Compare these two enquiries:
“Need water pump for CAT 3412.”
and:
Engine: Caterpillar 3412C
Complete serial number: provided
Serial-number prefix: provided
Arrangement number: provided
Existing pump number: 7C-3613
Application: Marine propulsion
Quantity: 1
The second enquiry gives much more useful identification information.
This can reduce the risk of supplying a component that looks correct but does not match the engine arrangement.
Caterpillar 3412 and the 3400 Series
The Caterpillar 3412 belongs to the wider Caterpillar 3400 Series.
Other important engine families include:
Caterpillar 3406 — inline 6
Caterpillar 3408 — V8
Caterpillar 3412 — V12
Different generations were produced within these families, and suffix naming was not necessarily identical across every model.
This is why the 3400 Series should be viewed as a wider engine platform rather than one common parts catalogue.
For other Caterpillar engines, browse our CAT Marine Engine Parts & Rebuild Kits.
You can also browse the complete Caterpillar Engine Catalogue.
Caterpillar 3408 vs 3412
The Caterpillar 3408 and Caterpillar 3412 both belong to the 3400 Series, but their cylinder configurations are different.
Caterpillar 3408 — V8
Caterpillar 3412 — V12
The 3412 therefore has four additional cylinders and greater total displacement.
Even though the engines share the wider 3400 Series heritage, their major structural components should not automatically be treated as interchangeable.
Which Caterpillar 3412 Is Best?
There is no single 3412 generation that is automatically best for every vessel or application.
Earlier mechanically controlled engines can appeal to operators familiar with traditional mechanical fuel and governor systems.
Later generations such as the 3412E introduced electronic engine control and associated monitoring components.
For an existing vessel, however, the more useful question is usually not:
“Which Caterpillar 3412 is best?”
It is:
“Which exact Caterpillar 3412 is installed?”
Once the exact engine generation, serial number and arrangement are known, maintenance planning and parts selection become much more reliable.
Caterpillar 3412, 3412C & 3412E Engine Pages
For more detailed information about individual Caterpillar 3412 generations, browse our dedicated engine pages:
Caterpillar 3412 Marine Engine Parts
Caterpillar 3412C Marine Engine Parts
Caterpillar 3412E Marine Engine Parts
The 3412B and 3412D are also covered in this article because they appear within the wider Caterpillar 3412 history and technical documentation.
Regardless of generation, always verify the individual engine before ordering parts.
Frequently Asked Questions About Caterpillar 3412 Engines
What are the different types of Caterpillar 3412 engines?
Important Caterpillar 3412-family designations include:
- Caterpillar 3412
- Caterpillar 3412B
- Caterpillar 3412C
- Caterpillar 3412D
- Caterpillar 3412E
They belong to the same wider engine lineage but should not automatically be treated as identical for parts selection.
Does a Caterpillar 3412B exist?
Yes.
Historical Caterpillar technical information documents the 3412B designation, including marine-engine applications.
If your data plate identifies the engine as a 3412B, provide the complete model designation and serial number when requesting parts.
Is the Caterpillar 3412 a V12?
Yes.
The Caterpillar 3412 family uses a V12 four-stroke diesel-engine architecture.
What is the displacement of the Caterpillar 3412?
Traditional Caterpillar 3412-family configurations have approximately 27 litres of displacement.
What is the bore and stroke of the Caterpillar 3412?
Common documented dimensions for the traditional 3412 platform are approximately:
Bore: 137.2 mm
Stroke: 152.4 mm
Exact specifications should still be checked against the particular engine.
What is the difference between Caterpillar 3412 and 3412C?
The 3412C is a later generation within the wider 3412 family.
Both retain the V12 approximately 27-litre architecture, but engine arrangements, fuel-system equipment, turbochargers, cooling components and other parts can differ.
Visit our Caterpillar 3412C Marine Engine Parts page for dedicated information.
What is the difference between Caterpillar 3412C and 3412E?
One of the most significant differences is engine-control technology.
Applicable 3412C marine configurations use mechanical control arrangements, while the 3412E belongs to the later electronic-control generation.
This can create significant differences in fuel-system, electrical and control components.
Visit our Caterpillar 3412E Marine Engine Parts page for more information.
Is the Caterpillar 3412C used in marine applications?
Yes.
The Caterpillar 3412C has been used for marine propulsion and other applicable marine duties.
Is the Caterpillar 3412E electronic?
Yes.
Electronic engine control is one of the important distinguishing characteristics of the 3412E generation.
Are Caterpillar 3412C and 3412E parts interchangeable?
Do not assume so.
Fuel-system components, electronic controls, sensors, turbochargers, cooling-system parts and other components can differ.
Always verify the complete engine information.
Does every Caterpillar 3412 use the same seawater pump?
No.
Different 3412, 3412C, 3412D and 3412E marine arrangements can use different pump references.
Read our Caterpillar 3412 Seawater Pump Guide for examples.
What Caterpillar 3412 seawater-pump part numbers are commonly encountered?
Important application-specific references include:
6I-1898 / 6I1898
197-4855 / 1974855
7C-3613 / 7C3613
Applicable Caterpillar Reman references can include:
0R-7722 / 0R7722
0R-7731 / 0R7731
0R-7732 / 0R7732
These references should not be treated as universally interchangeable.
Why does my Caterpillar 3412 overheat under load?
Possible causes can include inadequate seawater flow, seawater-pump wear, blocked strainers, restricted heat exchangers, cooling-system contamination, thermostat problems and other cooling-system faults.
Read our Caterpillar 3412 Raw Water Pump: When Seawater Flow Drops article for more information.
Why does my Caterpillar 3412 lose power under load?
Potential causes can involve the fuel system, injectors, turbocharger, aftercooler, air intake, exhaust system, cooling system or vessel load.
Read our Caterpillar 3412 Marine Engine Losing Power Under Load guide.
Can you supply Caterpillar 3412 engine parts?
Alfa Marine Spare Parts can assist with applicable components for Caterpillar 3412-family engines, subject to correct engine identification and availability.
Visit our Caterpillar 3412 Marine Engine Parts page.
Can you supply Caterpillar 3412C engine parts?
Yes. For dedicated information about the 3412C and available component categories, visit Caterpillar 3412C Marine Engine Parts.
Can you supply Caterpillar 3412E engine parts?
Yes. For the later electronic 3412 generation, visit Caterpillar 3412E Marine Engine Parts.
Related Caterpillar 3412 Pages & Technical Guides
Continue with our Caterpillar 3412 engine pages and technical articles:
Caterpillar 3412 Marine Engine Parts
Caterpillar 3412C Marine Engine Parts
Caterpillar 3412E Marine Engine Parts
Caterpillar 3412 Seawater Pumps – 6I-1898, 197-4855 & Reman Parts
Caterpillar 3412 Raw Water Pump: When Seawater Flow Drops
Caterpillar 3412 Marine Engine Losing Power Under Load
CAT Marine Engine Parts & Rebuild Kits
Caterpillar Engine Catalogue
Request Caterpillar 3412, 3412B, 3412C, 3412D & 3412E Parts
Looking for Caterpillar 3412, 3412B, 3412C, 3412D or 3412E engine parts?
Alfa Marine Spare Parts can assist with components for routine maintenance, corrective repairs, top-end overhaul and major engine rebuild requirements.
Send us:
Engine model: Caterpillar 3412 / 3412B / 3412C / 3412D / 3412E
Complete engine serial number:
Serial-number prefix:
Arrangement number:
Existing part number:
Part description:
Quantity:
Application: Marine propulsion / Auxiliary / Generator / Industrial
Power rating:
Rated RPM:
Required condition: Genuine / Caterpillar Reman / OEM / Replacement
Delivery destination:
For unidentified components, include clear photographs of the engine identification plate and existing component whenever available.
Requirements can include:
- Fuel injectors
- Fuel injection components
- Fuel pumps
- Turbochargers
- Turbocharger components
- Cylinder heads
- Pistons
- Piston rings
- Cylinder liners
- Connecting rods
- Main bearings
- Connecting rod bearings
- Seawater pumps
- Jacket-water pumps
- Oil pumps
- Oil coolers
- Aftercooler components
- Sensors
- Electrical components
- Gaskets
- Seals
- Overhaul components
Email: request@alfamarinespareparts.com
Request a Quote
For the individual engines, visit:
Caterpillar 3412 Marine Engine Parts
Caterpillar 3412C Marine Engine Parts
Caterpillar 3412E Marine Engine Parts
For cooling-system information, read our Caterpillar 3412 Seawater Pump Guide.