Caterpillar C12 ACERT Marine Engine Parts, Spares & Overhaul

Caterpillar C12 ACERT Marine Engine Parts & Spares

Alfa Marine Spare Parts supplies Caterpillar C12 ACERT marine engine parts and spares for yachts, recreational vessels, high-performance craft and marine propulsion applications.

We source genuine, OEM, replacement and applicable Reman Caterpillar C12 ACERT parts, subject to availability, for scheduled maintenance, engine repairs, top-end overhaul and complete engine rebuild requirements.

Our sourcing capabilities cover fuel injectors, fuel-system components, cylinder heads, pistons, piston rings, connecting rods, bearings, turbochargers, aftercooler components, 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 C12 ACERT is a 12-litre inline six-cylinder four-stroke diesel engine developed for high-performance marine propulsion.

Caterpillar rates applicable C12 ACERT marine configurations at 660–705 bhp (492–526 bkW) at 2,300 rpm.

For the related engine platform, visit our Caterpillar C12 Marine Engine Parts page.

You can also browse our Caterpillar Marine Engine Parts & Rebuild Kits.

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 C12 ACERT component? Request a Quote or email request@alfamarinespareparts.com.

Caterpillar C12 ACERT Engine Overview

The Caterpillar C12 ACERT is a high-performance marine diesel engine designed primarily for pleasure-craft and recreational marine propulsion applications.

The engine uses an inline six-cylinder configuration with a 130 mm cylinder bore and 150 mm piston stroke, producing a displacement of approximately 12 litres.

Applicable Caterpillar C12 ACERT marine ratings produce:

660–705 bhp (492–526 bkW)

at:

2,300 rpm

The engine uses turbocharging and aftercooling together with an electronically controlled unit-injection fuel system.

Applicable C12 ACERT marine configurations meet IMO II emissions requirements.

Although the C12 ACERT belongs to the wider C12 platform, parts should always be identified against the individual engine serial number and arrangement.

Caterpillar C12 ACERT Technical SpecificationsSpecificationCaterpillar C12 ACERTManufacturerCaterpillarEngine modelC12 ACERTEngine type4-stroke dieselCylinder configurationInline 6Number of cylinders6Cylinder bore130 mmPiston stroke150 mmDisplacement12.0 LPower range660–705 bhpPower range492–526 bkWRated speed2,300 rpmAspirationTurbocharged and aftercooledFuel systemElectronically controlled unit injectionEmissionsIMO IIRotation from flywheel endCounterclockwiseDry weightApprox. 1,174 kgLengthApprox. 1,574 mmWidthApprox. 969 mmHeightApprox. 1,005 mmPrimary applicationHigh-performance marine propulsion / pleasure craftParts identificationSerial number and arrangement dependent

Exact installed equipment and component specifications can vary according to the individual engine arrangement and vessel installation.

Caterpillar C12 ACERT Marine Engine Parts

Alfa Marine Spare Parts can assist with a broad selection of Caterpillar C12 ACERT engine parts for routine maintenance, corrective repairs and planned overhaul work.

Parts categories include:

Fuel-system components
Fuel injectors
Cylinder-head components
Pistons and piston rings
Connecting rods
Crankshaft components
Main and connecting-rod bearings
Turbocharger components
Aftercooler parts
Cooling-system components
Lubrication-system components
Electronic controls
Sensors
Electrical components
Gaskets and seals
Maintenance parts
Overhaul components

You can also browse our Marine Spare Parts Catalogue.

Caterpillar C12 ACERT 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

Cylinder-head components should be verified against the complete engine serial number and arrangement before ordering.

Caterpillar C12 ACERT 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

Because C12 engines exist in different ratings and applications, internal components should not be selected from displacement or model name alone.

Caterpillar C12 ACERT Fuel System Parts

The Caterpillar C12 ACERT marine engine uses an electronically controlled unit-injection fuel system.

Fuel-system requirements can include:

Fuel injectors
Injector components
Injector seals
Fuel transfer pumps
Fuel priming components
Primary fuel filters
Secondary fuel filters
Fuel-water separator components
Fuel pressure components
Fuel lines
Fuel fittings
Sensors
Electronic-control components
Wiring harnesses
Connectors
Fuel-system gaskets

Correct injector and fuel-system identification is particularly important because component specifications can vary between C12 applications.

Caterpillar C12 ACERT Fuel Injectors

For C12 ACERT injector requirements, provide:

Engine model: Caterpillar C12 ACERT

Application: Marine

Engine serial number:

Serial-number prefix:

Arrangement number:

Existing injector part number:

Quantity:

This information helps determine the correct injector and any applicable superseded or Reman reference.

Do not assume that every injector listed for a Caterpillar C12 is automatically correct for a C12 ACERT marine engine.

Caterpillar C12 ACERT Turbocharger Parts

Turbocharging is an important part of the C12 ACERT high-performance marine configuration.

Turbocharger requirements can include:

Complete turbochargers
Applicable Reman turbochargers
Turbocharger cartridges
Compressor components
Turbine components
Bearings
Seals
Oil-feed components
Oil-return components
Cooling connections
Intake connections
Exhaust connections
Mounting gaskets

Correct turbocharger selection depends on the engine arrangement and rating.

For identification, provide:

C12 ACERT + Engine Serial Number + Existing Turbocharger NumberCaterpillar C12 ACERT Aftercooler Parts

Caterpillar specifies the C12 ACERT marine engine as turbocharged and aftercooled.

The standard marine arrangement includes a sea-water aftercooler.

Aftercooler requirements can include:

Aftercooler assemblies
Aftercooler cores
Housings
End covers
Gaskets
O-rings
Seals
Air connections
Cooling connections
Mounting components

Aftercooler components should always be identified according to the individual engine arrangement.

Caterpillar C12 ACERT Cooling System Parts

The cooling system is particularly important on a high-output marine engine such as the C12 ACERT.

Cooling-system requirements can include:

Sea water pumps
Raw-water pumps
Jacket-water pumps
Heat exchangers
Aftercooler components
Oil coolers
Thermostats
Expansion-tank components
Cooling pipes
Hoses
Pump shafts
Mechanical seals
Bearings
Gaskets
O-rings

Correct cooling-system components should be selected using the complete engine identification.

Caterpillar C12 ACERT Sea Water Pump Parts

Applicable sea-water pump requirements can include:

Complete sea water pumps
Raw-water pumps
Pump housings
Pump shafts
Mechanical seals
Bearings
Pump covers
Gaskets
O-rings
Repair components

Correct pump identification can depend on:

Engine serial number
Arrangement number
Existing pump number
Engine rating
Cooling-system configuration
Vessel installation

Always provide the existing pump number whenever available.

Caterpillar C12 ACERT Heat Exchanger Parts

Heat-exchanger requirements can include:

Complete heat exchangers
Heat exchanger cores
End covers
Expansion-tank components
Gaskets
O-rings
Seals
Cooling connections
Mounting components

Heat exchanger and aftercooler components should be inspected carefully in seawater-operated systems because corrosion, deposits and sealing deterioration can affect cooling performance.

Caterpillar C12 ACERT 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 operation is essential for protecting bearings, pistons, crankshaft components, camshaft components and the turbocharger.

Caterpillar C12 ACERT 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 C12 ACERT 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 verified against the individual engine arrangement.

Caterpillar C12 ACERT Electronic Control Parts

The C12 ACERT uses electronic engine management together with its electronically controlled fuel-injection system.

Electronic requirements can include:

Electronic control modules
Engine sensors
Pressure sensors
Temperature sensors
Speed sensors
Wiring harnesses
Connectors
Engine monitoring components
Diagnostic components
Switches
Senders

The control system supports functions including electronic governing, engine monitoring, diagnostics and fault logging.

Electronic components should always be identified using the engine serial number and existing component number.

Caterpillar C12 ACERT 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 C12 ACERT Intake & Exhaust Parts

Intake and exhaust requirements can include:

Intake manifolds
Exhaust manifolds
Turbocharger connections
Aftercooler components
Air-intake pipes
Exhaust connections
Exhaust elbows
Gaskets
Seals
Clamps
Mounting hardware

Correct configuration is particularly important when sourcing components around the turbocharger and aftercooling system.

Caterpillar C12 ACERT Gaskets & Seals

Gasket and sealing requirements can include:

Cylinder-head sealing components
Rocker-cover gaskets
Intake-manifold gaskets
Exhaust-manifold gaskets
Turbocharger gaskets
Aftercooler seals
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 C12 ACERT Overhaul Parts

For a Caterpillar C12 ACERT marine engine overhaul, Alfa Marine Spare Parts can assist with applicable:

Pistons
Piston rings
Piston pins
Cylinder components
Cylinder-head components
Intake valves
Exhaust valves
Connecting rods
Main bearings
Connecting-rod bearings
Thrust components
Crankshaft components
Camshaft components
Fuel injectors
Turbocharger components
Aftercooler components
Cooling-system parts
Oil pumps
Oil cooler components
Electronic components
Gaskets
O-rings
Seals

For complete overhaul requirements, send the engine identification together with the required parts list.

Caterpillar C12 ACERT 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
Cylinder-head sealing components
O-rings
Seals

The final overhaul scope should be determined according to engine condition, operating hours, service history and inspection results.

Caterpillar C12 ACERT Reman Parts

Applicable Caterpillar Reman components may be available for selected C12 ACERT requirements.

Depending on the individual engine and component, these can include:

Fuel injectors
Fuel-system components
Turbochargers
Cylinder-head components
Starters
Alternators
Electronic components
Other major engine components

Reman compatibility should always be checked against:

C12 ACERT + Engine Serial Number + Existing Part NumberCaterpillar C12 ACERT Marine Applications

Caterpillar positions the C12 ACERT as a high-performance marine propulsion engine.

Typical applications can include:

Yachts
Motor yachts
Pleasure craft
Recreational vessels
High-performance boats
Other applicable marine propulsion installations

Caterpillar provides a range of optional equipment to adapt the engine to individual pleasure-craft installations.

Caterpillar C12 ACERT Power Ratings

Caterpillar specifies the C12 ACERT marine engine at:

660–705 bhp

or:

492–526 bkW

at:

2,300 rpm

These high-performance ratings distinguish the C12 ACERT configuration from lower-output commercial C12 ratings.

Caterpillar specifies IMO II emissions compliance for the C12 ACERT marine configuration.

Caterpillar C12 vs C12 ACERT

The Caterpillar C12 and C12 ACERT are closely related but should not be treated as identical configurations for parts selection.

Both use:

Inline six-cylinder architecture
12-litre displacement
130 mm bore
150 mm stroke
Turbocharging and aftercooling
Electronic engine control

However, their marine ratings and intended applications differ.

The commercial C12 range includes lower-output ratings, while the C12 ACERT high-performance marine configuration produces 660–705 bhp at 2,300 rpm.

Differences can affect:

Fuel-system components
Fuel injectors
Turbocharger components
Aftercooler components
Cooling-system parts
Electronic controls
Engine calibration
Exhaust components
Supporting hardware

For the broader engine platform, visit our Caterpillar C12 Marine Engine Parts page.

Caterpillar C12 ACERT vs C18 ACERT

Caterpillar also offers the larger C18 ACERT for high-performance recreational marine propulsion.

The engines should be treated as completely separate platforms for parts identification.

Differences include:

Engine displacement
Internal engine components
Power output
Fuel-system components
Turbocharging arrangements
Cooling-system components
Electronic controls
Overhaul components

For related Caterpillar engine requirements, visit our Caterpillar C18 Marine Engine Parts page.

Caterpillar C12 ACERT Parts Identification

Correct parts identification is essential because the wider C12 platform exists in different marine ratings and configurations.

When requesting parts, provide:

Engine model: Caterpillar C12 ACERT

Application: Marine

Engine serial number:

Serial-number prefix:

Arrangement number:

Existing part number:

Part description:

Quantity:

For fuel injectors, turbochargers, pumps, ECMs, starters and alternators, photographs of the existing component can also assist with identification.

The preferred identification sequence is:

Caterpillar C12 ACERT + Engine Serial Number + Arrangement Number + Existing Part NumberWhy Source Caterpillar C12 ACERT Parts From Alfa Marine Spare Parts?

Alfa Marine Spare Parts supports yacht operators, vessel owners, ship managers, shipyards, marine engineers, purchasing departments, repair companies and engine rebuilders with Caterpillar C12 ACERT marine engine parts and spares.

Depending on availability, we can assist with:

Maintenance parts
Fuel injectors
Fuel-system components
Electronic-control components
Cylinder components
Internal engine parts
Turbochargers
Aftercooler components
Cooling-system parts
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

For the wider engine platform, visit our Caterpillar C12 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 C12 ACERT a Marine Engine?

Yes. Caterpillar identifies the C12 ACERT as a high-performance marine propulsion engine for pleasure-craft applications.

How Many Cylinders Does the C12 ACERT Have?

The C12 ACERT is an inline six-cylinder four-stroke diesel engine.

What Is the Caterpillar C12 ACERT Displacement?

The C12 ACERT has a displacement of approximately 12 litres.

What Are the C12 ACERT Bore and Stroke?

The engine uses a 130 mm bore and 150 mm stroke.

How Much Power Does the Caterpillar C12 ACERT Produce?

Caterpillar specifies 660–705 bhp (492–526 bkW) for the high-performance marine configuration.

What Is the Caterpillar C12 ACERT Rated Speed?

The high-performance marine engine is rated at 2,300 rpm.

Is the C12 ACERT Turbocharged?

Yes. Caterpillar specifies the engine as turbocharged and aftercooled.

Does the C12 ACERT Use Electronic Fuel Injection?

Yes. The engine uses an electronically controlled unit-injection fuel system.

What Emissions Standard Does the C12 ACERT Meet?

Caterpillar specifies IMO II for the current high-performance C12 ACERT marine configuration.

Is the C12 ACERT the Same as the C12?

They belong to the same wider C12 platform, but the C12 ACERT high-performance configuration should be treated separately for parts identification.

Can You Supply Caterpillar C12 ACERT Fuel Injectors?

Yes. We can assist with applicable C12 ACERT fuel injectors and related fuel-system components, subject to identification and availability.

Can You Supply Caterpillar C12 ACERT Turbochargers?

Yes. We can assist with applicable turbocharger requirements.

Provide the engine serial number and existing turbocharger number whenever available.

Can You Supply Caterpillar C12 ACERT 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 for accurate identification.

Can You Supply Caterpillar C12 ACERT Overhaul Parts?

Yes. Depending on availability, we can assist with pistons, rings, bearings, cylinder-head components, fuel injectors, turbocharger components, cooling parts, gaskets, seals and other overhaul requirements.

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Caterpillar Marine Engine Parts & Rebuild Kits

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