John Deere 6125 Marine Engine Parts, Spares & Overhaul
John deere 6125
John Deere 6125 Marine Engine Parts & Spare Parts
Alfa Marine Spare Parts supplies John Deere 6125 marine engine parts and spare parts for commercial vessels, workboats, fishing vessels, passenger craft, auxiliary installations and marine generator applications.
We source genuine, OEM and replacement John Deere 6125 parts, subject to availability, for scheduled maintenance, corrective repairs and complete engine overhaul requirements.
Our sourcing capabilities cover fuel-system components, turbochargers, cylinder heads, pistons, cylinder liners, connecting rods, bearings, water pumps, seawater pumps, oil pumps, filters, cooling-system components, electrical parts, controllers, starters, alternators, gaskets, seals and other John Deere 6125 engine requirements.
The 6125 belongs to John Deere's older PowerTech 12.5-litre marine engine family.
Documented marine models include:
John Deere 6125AFM01
John Deere 6125AFM75
John Deere 6125SFM75
For the wider engine range, visit our John Deere Marine Engine Parts page.
For correct parts identification, provide the complete engine designation, engine serial number and existing part number whenever available.
Need a specific John Deere 6125 component? Request a Quote or email request@alfamarinespareparts.com.
John Deere 6125 Marine Engine Overview
The John Deere 6125 is a six-cylinder, four-stroke marine diesel engine from the PowerTech engine family.
The 6125AFM75 uses:
- 6-cylinder inline configuration
- 12.5-litre displacement
- 127 mm cylinder bore
- 165 mm piston stroke
- Turbocharging
- Aftercooling
- Replaceable wet-type cylinder liners
The 6125AFM75 was offered in multiple marine propulsion ratings, making it suitable for a range of vessel duties rather than one fixed horsepower application.
Depending on rating, documented propulsion outputs include approximately:
254 kW / 341 hp at 1,800 rpm
298 kW / 400 hp at 1,900 rpm
339 kW / 455 hp at 2,000 rpm
392 kW / 526 hp at 2,100 rpm
Exact specifications depend on the complete engine designation, rating and installation.
The 6125 family can be found in applications such as:
- Commercial workboats
- Fishing vessels
- Patrol craft
- Launches
- Trawler yachts
- Passenger vessels
- Auxiliary installations
- Marine generator sets
Because several 6125 configurations exist, parts should never be selected using only the number 6125.
John Deere 6125 Marine Engine Models
The John Deere 6125 marine engine family includes several configurations, so the complete engine designation should always be checked before ordering replacement parts.
Engine ModelEngine FamilyConfigurationTypical ApplicationJohn Deere 6125AFM01PowerTech 12.5 LInline 6Marine propulsionJohn Deere 6125AFM75PowerTech 12.5 LInline 6Marine propulsionJohn Deere 6125SFM75PowerTech 12.5 LInline 6Applicable marine configurations
Although these engines belong to the same 6125 family, parts should not automatically be considered interchangeable.
Fuel-system components, turbochargers, cooling-system parts, electrical equipment and other components can vary according to engine model, serial number, rating and production revision.
For accurate identification, provide:
Complete engine designation + engine serial number + existing part number
John Deere 6125 Technical SpecificationsSpecificationJohn Deere 6125AFM75Engine familyPowerTech 12.5 LEngine type4-stroke marine dieselCylinder configurationInline 6Displacement12.5 LBore127 mmStroke165 mmCompression ratio17.0:1AspirationTurbocharged and aftercooledCylinder linersReplaceable wet-typeRated speedApprox. 1,800–2,100 rpm depending on ratingRated outputApprox. 254–392 kWRated horsepowerApprox. 341–526 hpCoolingMarine heat-exchanger or applicable keel-cooled configurationsApplicationsMarine propulsion, auxiliary and generator applications
Exact specifications can vary according to the complete engine model, rating, production revision and application.
John Deere 6125AFM01
The John Deere 6125AFM01 is another documented marine configuration within the 12.5-litre family.
John Deere replacement-parts information for the 6125AFM01 covers components such as:
- Fuel filters
- Oil filters
- Alternators
- Starter motors
- Crankshaft pulleys
- Dampers
- Short-block assemblies
- Belts
- Cooling-system components
- Marine seawater-pump components
This makes the complete engine suffix important.
A part listed for:
6125AFM01
should not automatically be assumed to fit:
6125AFM75
or:
6125SFM75
without checking the engine serial number and applicable parts information.
John Deere 6125AFM75
The John Deere 6125AFM75 is one of the best-documented 6125 marine variants.
It is a 12.5-litre inline six-cylinder PowerTech engine used for marine propulsion and related marine power applications.
Replacement requirements for the 6125AFM75 can include major components such as:
- Connecting rods
- Turbochargers
- Alternators
- Engine controllers
- Injection components
- Starter motors
- Water pumps
- Oil pumps
- Engine-block components
- Crankshafts
This continued parts requirement is important because many 6125 engines remain in commercial service despite belonging to an older John Deere marine-engine generation.
John Deere 6125 Parts We Can Source
Alfa Marine Spare Parts can assist with a broad range of John Deere 6125 engine parts for routine maintenance, repairs and major overhaul requirements.
SystemTypical PartsFuel SystemInjectors, injection nozzles, fuel pumps, filters, fuel lines and sealsCooling SystemWater pumps, seawater pumps, impellers, thermostats, heat-exchanger components and sealsTurbochargingTurbochargers, cartridges, gaskets and associated componentsCylinder ComponentsCylinder heads, valves, liners, pistons and piston ringsCranktrainConnecting rods, crankshafts, main bearings, rod bearings and thrust bearingsLubricationOil pumps, oil filters, oil coolers, seals and gasketsElectricalStarters, alternators, controllers, sensors and wiring componentsOverhaulGasket sets, seals, bearings, liners, pistons and applicable overhaul components
Parts availability depends on the exact 6125 configuration and component required.
John Deere 6125 Fuel System Parts
Fuel-system condition has a major influence on engine performance, combustion quality and reliability.
Depending on the exact 6125 configuration, requirements can include:
- Injection nozzles
- Injectors
- Fuel lines
- Fuel filters
- Fuel pumps
- Fuel-system seals
- High-pressure components
- Fuel-system fittings
One documented service reference associated with applicable 6125 configurations is:
John Deere RE507284 Fuel Filter
Fuel-line components such as RE507533 are also associated with applicable 6125AFM01, 6125AFM75 and 6125SFM75 configurations.
Always verify the full engine designation and serial number before ordering fuel-system components.
John Deere 6125 Turbocharger Parts
The 6125AFM75 is turbocharged and aftercooled.
Turbocharger requirements can include:
- Complete turbocharger
- Remanufactured turbocharger
- Turbocharger cartridge
- Bearings
- Seals
- Oil-feed components
- Oil-return components
- Exhaust-side hardware
- Intake connections
- Gaskets
Different turbocharger references can apply according to the engine configuration.
This is another area where the engine model alone is not enough.
Whenever possible, provide the existing turbocharger identification number together with the engine serial number.
John Deere 6125 Cooling System Parts
The marine cooling system can include components such as:
- Jacket-water pump
- Sea water pump
- Raw water pump
- Seawater-pump impeller
- Heat exchanger
- Thermostats
- Cooling hoses
- Gaskets
- Seals
- Coolant pipes
- Aftercooler components
An important documented marine component is:
John Deere RE45458 Seawater Pump
The RE45458 seawater pump is associated with applicable 6125AFM01 applications.
Another documented marine component is:
John Deere RE49896 Water Pump Impeller Kit
The RE49896 impeller kit is associated with applicable 6125AFM01 marine applications.
These references should not automatically be applied to every 6125 marine engine.
Always check the complete engine designation and serial number first.
John Deere 6125 Water Pump Parts
The engine's closed-loop cooling system and seawater circuit perform different functions.
Depending on the exact configuration, John Deere 6125 water-pump requirements can include:
- Complete water pump
- Seawater pump
- Pump impeller
- Mechanical seal
- Bearings
- Shaft
- Gaskets
- O-rings
- Pump housing components
Different replacement water-pump assemblies can apply to different 6125 configurations.
If an existing pump is available, send photographs showing:
The complete pump
Pump mounting
Inlet and outlet arrangement
Drive arrangement
Any visible part number
This helps prevent confusion between different cooling-system pumps.
John Deere 6125 Cylinder Head & Internal Engine Parts
For top-end repairs and major overhaul work, Alfa Marine Spare Parts can assist with requirements including:
- Cylinder heads
- Cylinder-head gaskets
- Valves
- Valve guides
- Valve seats
- Rocker components
- Pistons
- Piston rings
- Cylinder liners
- Connecting rods
- Connecting-rod bearings
- Main bearings
- Crankshafts
- Camshaft components
- Complete gasket sets
- Short blocks
One of the important characteristics of the 6125 design is its replaceable wet-type cylinder liners, which supports major engine rebuilding when the condition of the engine and availability of components make overhaul practical.
John Deere 6125 Overhaul Parts
A John Deere 6125 overhaul requirement can range from a top-end repair to a complete engine rebuild.
Depending on inspection results, required components can include:
Cylinder liners
Pistons
Piston rings
Connecting-rod bearings
Main bearings
Thrust bearings
Cylinder-head components
Valve components
Gaskets
O-rings
Crankshaft seals
Oil-pump components
Water-pump components
Fuel-system parts
A documented marine overhaul reference associated with applicable 6125AFM01 applications is:
John Deere RE49897 Engine Overhaul Kit
However, this does not mean one universal overhaul kit covers all 6125 versions.
Confirm the complete engine designation and serial number before selecting overhaul components.
John Deere 6125 Oil & Lubrication Parts
Lubrication-system components can include:
- Oil pump
- Oil filter
- Oil cooler
- Oil pressure sensors
- Oil lines
- Oil seals
- Gaskets
- Pressure-regulating components
A commonly documented service reference for applicable 6125 engines is:
John Deere RE58935 Oil Filter
The RE58935 is associated with applicable 6125AFM01 and 6125AFM75 configurations.
Service components should always be verified against the individual engine.
John Deere 6125 Electrical & Electronic Parts
Depending on the engine configuration, electrical and electronic requirements can include:
- Engine controller
- ECU
- Sensors
- Wiring harness
- Starter motor
- Alternator
- Relays
- Switches
- Throttle controls
- Instrument-panel components
A documented engine-controller reference associated with multiple 6125 configurations is:
John Deere RE507980 Engine Controller
Applicable engine configurations include the:
6125AFM01
6125AFM75
6125SFM75
Starter and alternator references can vary according to the engine and electrical-system specification.
Always identify the system voltage and existing part number before ordering.
John Deere 6125 Starter Motors
Different starter configurations can be found across the 6125 family.
Documented references can include:
RE515843 — 12 V starter
RE515895 — 24 V starter
RE539584 — 12 V starter
RE540886 — applicable starter configuration
The exact starter depends on the engine build and electrical specification.
Do not order a starter using only the 6125 engine-family designation.
Verify the existing starter number, system voltage and engine serial number.
John Deere 6125 Alternators
The 6125 family can also use different alternator configurations.
Documented examples include:
RE500226 — 12 V, 140 A
RE65414 — 24 V, 60 A
RE500227 — 12 V, 90 A
RE501112 — 12 V, 105 A
Additional alternator arrangements may exist depending on the engine version.
Before ordering, verify:
Engine serial number
System voltage
Alternator output
Existing alternator part number
John Deere 6125 Short Block & Major Components
Major 6125 engine repairs can require components such as:
- Short block
- Engine block
- Crankshaft
- Connecting rods
- Pistons
- Cylinder liners
- Cylinder head
- Oil pump
- Gasket sets
- Bearings
- Seals
Short-block and major-engine-component requirements should always be identified against the complete engine serial number.
Availability can vary because the 6125 belongs to an older engine generation.
For major overhaul requirements, send the complete engine identification before planning the rebuild around a particular assembly.
John Deere 6125AFM01 vs 6125AFM75
The 6125AFM01 and 6125AFM75 belong to the same 12.5-litre marine engine family, but they should not be treated as identical engines for parts selection.
They can differ in areas such as:
- Fuel-system configuration
- Engine controls
- Cooling-system components
- Turbocharger configuration
- Electrical components
- Production revision
- Engine rating
- Marine installation
Some parts can appear across both versions, while others can be specific to one configuration.
Always check the serial number.
John Deere 6125 vs 6135
The John Deere 6125 and 6135 are different engine families.
The 6125 uses approximately 12.5 litres of displacement, while the later 6135 family uses approximately 13.5 litres.
Although both are large six-cylinder John Deere engine families, components should not automatically be considered interchangeable.
For additional John Deere engine models, visit our John Deere Marine Engine Parts page.
Typical John Deere 6125 Marine Applications
The 6125 marine engine family has been used across demanding vessel applications.
Fishing Vessels
Commercial fishing vessels can require reliable propulsion and auxiliary power during extended operating periods.
Workboats
The 6125's displacement and power characteristics make applicable configurations suitable for commercial workboat applications.
Patrol & Government Craft
Marine engines in these applications can operate across changing loads and vessel speeds.
Passenger Craft
Applicable 6125 configurations can be found in commercial passenger and transport applications.
Trawler Yachts
Some propulsion ratings can be suitable for trawler-yacht and longer-range recreational marine applications.
Marine Generator Applications
6125-family engines have also been used in applicable marine auxiliary and generator applications.
Common John Deere 6125 Parts Requests
Common enquiries for older 6125 marine engines can include:
- John Deere 6125 fuel injector
- John Deere 6125 injection nozzle
- John Deere 6125 turbocharger
- John Deere 6125 seawater pump
- John Deere 6125 raw water pump
- John Deere 6125 water pump
- John Deere 6125 oil pump
- John Deere 6125 cylinder head
- John Deere 6125 cylinder liner
- John Deere 6125 piston
- John Deere 6125 piston rings
- John Deere 6125 connecting rod
- John Deere 6125 crankshaft
- John Deere 6125 overhaul kit
- John Deere 6125 gasket kit
- John Deere 6125 starter motor
- John Deere 6125 alternator
- John Deere 6125 engine controller
- John Deere 6125 filters
Because the engine belongs to an older generation, availability can vary by component and engine configuration.
Searching for a Specific John Deere 6125 Part?
If you already have a part number, include it with your enquiry.
Useful identification information includes:
John Deere part number
Engine model — for example 6125AFM01 or 6125AFM75
Engine serial number
Part description
Quantity
Photographs of the existing component
This is particularly important for older 6125 engines because components may differ according to production revision, engine rating and installed marine configuration.
Do not order a component solely because an online listing says:
“Fits John Deere 6125”
The complete engine identification should be checked first.
Why the John Deere 6125 Engine Serial Number Matters
An enquiry saying:
“I need a water pump for John Deere 6125.”
may not provide enough information.
Is the engine a:
6125AFM01?
6125AFM75?
6125SFM75?
Is the requirement for the engine coolant pump or the marine seawater pump?
Has the original component previously been replaced or superseded?
For accurate identification, provide:
Complete engine model
Engine serial number
Existing part number
Part description
Quantity
Photographs can also be particularly useful for older engines.
Why Source John Deere 6125 Parts Through Alfa Marine Spare Parts?
Older marine engines can remain in commercial service long after their original production period, while individual components can become increasingly difficult to identify or source.
Alfa Marine Spare Parts assists vessel operators, shipyards, marine engineers and repair companies with sourcing John Deere 6125 marine engine parts for maintenance, repair and overhaul requirements.
We can assist with:
- Individual replacement components
- Routine maintenance parts
- Cooling-system components
- Fuel-system parts
- Turbocharger components
- Electrical components
- Major engine components
- Overhaul requirements
- Genuine, OEM and replacement options where available
For older or difficult-to-identify components, send the engine serial number, existing part number and clear photographs.
Frequently Asked Questions About John Deere 6125 Marine EnginesIs the John Deere 6125 a Marine Engine?
Yes.
John Deere produced marine versions of the PowerTech 12.5-litre engine family, including the 6125AFM01 and 6125AFM75.
How Many Cylinders Does the John Deere 6125AFM75 Have?
The 6125AFM75 is an inline six-cylinder engine.
What Is the Displacement of the John Deere 6125 Marine Engine?
The 6125AFM75 has approximately 12.5 litres of displacement.
What Is the John Deere 6125 Bore and Stroke?
The documented 6125AFM75 bore and stroke are approximately:
127 mm bore
165 mm stroke
How Much Horsepower Does the John Deere 6125AFM75 Produce?
Depending on the applicable propulsion rating, documented versions range from approximately 341 hp to 526 hp.
Always identify the complete engine rating when comparing performance specifications.
Is the John Deere 6125 Turbocharged?
Applicable 6125 marine configurations such as the 6125AFM75 are turbocharged and aftercooled.
Does the John Deere 6125 Use Wet Cylinder Liners?
The 6125AFM75 uses replaceable wet-type cylinder liners.
Can You Supply John Deere 6125 Seawater Pumps?
Alfa Marine Spare Parts can assist with applicable John Deere 6125 marine cooling-system requirements, subject to exact engine identification and current parts availability.
Send the complete engine model, serial number and existing pump number whenever available.
Is RE45458 a John Deere 6125 Seawater Pump?
The RE45458 seawater pump is associated with applicable 6125AFM01 marine applications.
Do not assume it fits every 6125 variant without checking the complete engine identification.
Is RE49896 Used on the John Deere 6125?
The RE49896 water-pump impeller kit is associated with applicable 6125AFM01 marine applications.
Always verify compatibility before ordering.
What Oil Filter Does a John Deere 6125 Use?
The RE58935 oil filter is associated with applicable 6125AFM01 and 6125AFM75 configurations.
Always verify the service component against the individual engine.
Can You Supply Overhaul Parts for Older John Deere 6125 Engines?
Yes.
Alfa Marine Spare Parts can assist with 6125 overhaul requirements subject to the exact engine configuration and current parts availability.
Requirements can include liners, pistons, rings, bearings, gaskets, seals, cylinder components, pumps and other overhaul components.
Are 6125AFM01 and 6125AFM75 Parts Interchangeable?
Not automatically.
Although both belong to the PowerTech 12.5-litre family, individual components can differ according to engine configuration, production revision, rating and serial number.
Always check the individual part requirement before ordering.
Request John Deere 6125 Marine Engine Parts
Looking for John Deere 6125 marine engine parts, overhaul components or replacement spares?
Alfa Marine Spare Parts can assist with requirements for:
John Deere 6125AFM01
John Deere 6125AFM75
John Deere 6125SFM75
and other applicable 6125 marine configurations.
Send us your:
Engine model:
Engine serial number:
Existing part number:
Part description:
Quantity:
Required condition: Genuine / OEM / Replacement, subject to availability
Vessel name:
Current vessel location:
Delivery destination:
Required date:
For older 6125 engines, photographs of the engine identification plate and existing component can help with correct parts identification.
Email: request@alfamarinespareparts.com
You can also browse our John Deere Marine Engine Parts page for additional John Deere marine engine families and spare-parts information.
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