Wärtsilä 25 Marine Engine Parts & Spare Parts
Alfa Marine Spare Parts supplies Wärtsilä 25 marine engine parts and spare parts for commercial vessels, propulsion systems, auxiliary engines and power-generation applications.
We source genuine, OEM and replacement parts for Wärtsilä 25 engine configurations, including Wärtsilä 6L25, 7L25, 8L25 and 9L25, as well as applicable 25DF dual-fuel configurations.
Our supply capabilities cover routine maintenance parts, fuel-system components, cooling and lubrication parts, internal engine components and complete overhaul requirements.
For accurate parts identification, provide the complete engine model, engine serial number and existing part number whenever available.
Wärtsilä 25 Engine Overview
The Wärtsilä 25 is a medium-speed, four-stroke engine platform developed for marine propulsion, diesel-electric installations, hybrid systems and power-generation applications.
The platform uses a 250 mm cylinder bore and 340 mm piston stroke and is available in several inline cylinder configurations.
The Wärtsilä 25 engine family is designed around flexible marine power generation and has also been developed for newer fuel technologies. The platform includes diesel and dual-fuel applications as well as developments associated with NextDF and ammonia-capable operation.
Because specifications, fuel systems and individual components can differ between engine versions, the exact engine designation should always be confirmed before ordering Wärtsilä 25 spare parts.
Wärtsilä 25 Technical SpecificationsSpecificationWärtsilä 25Engine type4-stroke medium-speedCylinder configurationInline 6–9 cylindersCylinder bore250 mmPiston stroke340 mmEngine speed900 / 1000 rpmOutput per cylinder345 / 375 kWPiston speed10.2 / 11.3 m/sApplicationsMarine propulsion, diesel-electric and power generation
Technical specifications and output ratings can vary according to the individual engine configuration, fuel version and application.
Wärtsilä 25 Engine Models
The Wärtsilä 25 platform is available in several inline cylinder configurations. Alfa Marine Spare Parts can source maintenance, repair and overhaul components for applicable engines within the family.
Engine ModelConfigurationParts SupportWärtsilä 6L256-cylinder inlineMaintenance, repair and overhaul partsWärtsilä 7L257-cylinder inlineMaintenance, repair and overhaul partsWärtsilä 8L258-cylinder inlineMaintenance, repair and overhaul partsWärtsilä 9L259-cylinder inlineMaintenance, repair and overhaul partsWärtsilä 6L25 Parts
We source Wärtsilä 6L25 parts for scheduled maintenance, engine repair and overhaul requirements, including internal engine, fuel, cooling, lubrication and sealing components.
Wärtsilä 7L25 Parts
Our sourcing capabilities include Wärtsilä 7L25 spare parts for marine and power-generation installations. Engine serial number and existing part number should be supplied to confirm the correct component.
Wärtsilä 8L25 Parts
We supply and source Wärtsilä 8L25 engine parts, including cylinder components, bearings, valves, fuel-system parts, pumps, gaskets, seals and overhaul components.
Wärtsilä 9L25 Parts
Alfa Marine Spare Parts can source Wärtsilä 9L25 marine engine parts for maintenance, repair and major overhaul requirements, subject to component availability.
Wärtsilä 25DF Dual-Fuel Engine Parts
We can also source replacement parts for applicable Wärtsilä 25DF dual-fuel engines.
Configurations can include:
- Wärtsilä 6L25DF
- Wärtsilä 7L25DF
- Wärtsilä 8L25DF
- Wärtsilä 9L25DF
Dual-fuel engines can use different fuel-system, control and engine components compared with conventional diesel configurations.
When requesting Wärtsilä 25DF spare parts, always provide the complete engine designation, serial number and existing component part number whenever possible.
Wärtsilä 25 Ammonia & NextDF Technology
The Wärtsilä 25 platform has also been developed for the changing fuel requirements of the marine industry.
The engine family includes Wärtsilä 25 Ammonia technology for applicable alternative-fuel installations and NextDF technology for dual-fuel operation with reduced methane slip.
These newer configurations can incorporate specialized fuel-supply, injection, control and safety systems. Components should therefore be identified according to the specific engine and installation rather than assumed to be interchangeable with conventional Wärtsilä 25 diesel or earlier 25DF versions.
Wärtsilä 25 Spare Parts & Components
Alfa Marine Spare Parts sources a broad range of Wärtsilä 25 engine parts, maintenance spares and overhaul components.
Cylinder & Internal Engine Parts
- Cylinder liners
- Pistons
- Piston rings
- Cylinder heads
- Connecting rods
- Main bearings
- Connecting rod bearings
- Bushings and related internal components
Fuel & Injection System Parts
- Fuel injectors
- Fuel injection components
- Fuel pumps
- Fuel-system valves
- Fuel pipes and connections
- Applicable dual-fuel components
Valves & Cylinder Head Components
- Inlet valves
- Exhaust valves
- Valve guides
- Valve seats
- Valve springs
- Cylinder head sealing components
Cooling & Lubrication Parts
- Water pumps
- Cooling-system components
- Oil pumps
- Lubrication-system components
- Thermostatic components
- Gaskets and seals
Air, Exhaust & Turbocharger Components
- Turbocharger components
- Air-system components
- Exhaust-system components
- Manifold components
- Associated gaskets and seals
Maintenance & Overhaul Parts
- Overhaul gasket sets
- Gasket kits
- O-rings
- Sealing rings
- Filters
- Bearings
- Wear components
- Maintenance kits
Parts availability can include genuine Wärtsilä, OEM and replacement alternatives, depending on the engine configuration, individual component and customer requirement.
Wärtsilä 25 Overhaul Parts
For planned maintenance and major engine work, we can assist with sourcing Wärtsilä 25 overhaul parts for individual cylinders or larger engine overhaul requirements.
Typical requirements can include cylinder liners, pistons, piston rings, bearings, cylinder-head components, valves, seals, gaskets and related wear parts.
When preparing an overhaul parts request, supplying the engine serial number together with the required parts list helps reduce the risk of incorrect component selection.
Identifying the Correct Wärtsilä 25 Parts
Wärtsilä 25 engines can differ according to cylinder configuration, fuel version, production revision and vessel installation.
A description such as “Wärtsilä 8L25 water pump” or “Wärtsilä 6L25 injector” may therefore not provide enough information to identify the correct component.
For reliable parts identification, provide:
Engine model + engine serial number + existing part number
Photos of the existing component or identification plate can also be useful when a part number is unavailable or difficult to read.
Genuine, OEM & Replacement Wärtsilä 25 Parts
Depending on availability and customer requirements, Alfa Marine Spare Parts can source different supply options for Wärtsilä 25 engine spares.
These can include:
Genuine parts – supplied according to the applicable manufacturer reference.
OEM parts – components sourced from applicable original equipment manufacturing channels where available.
Replacement parts – alternative components for selected maintenance and repair requirements.
If a specific supply type is mandatory for your vessel or project, state this clearly when requesting your quotation.
Wärtsilä 25 Parts for Marine Applications
Wärtsilä 25 engines can be found in marine installations requiring propulsion or onboard electrical power.
We support parts enquiries for applications including commercial vessels, workboats, offshore vessels and other marine power-generation installations using applicable Wärtsilä 25 engine configurations.
For vessels operating internationally, we can assist with sourcing parts for planned maintenance, emergency repair and scheduled overhaul requirements.
Worldwide Supply of Wärtsilä 25 Spare Parts
Alfa Marine Spare Parts supports international customers requiring Wärtsilä marine engine parts and spare parts.
Whether the requirement is a single replacement component or a larger overhaul package, provide the vessel destination together with your enquiry so that suitable supply and delivery options can be evaluated.
Request Wärtsilä 25 Engine Parts
Need Wärtsilä 25 spare parts for maintenance, repair or overhaul?
For accurate identification and a faster quotation, send:
Engine model: Wärtsilä 6L25 / 7L25 / 8L25 / 9L25 / 25DF
Engine serial number:
Part number:
Part description:
Quantity:
Required condition: Genuine / OEM / Replacement
Delivery Destination:
Alfa Marine Spare Parts can assist with sourcing Wärtsilä 25 marine engine parts, replacement spares and overhaul components for worldwide supply.
Request Sulzer Wärtsilä Marine Engine Parts
Looking for Sulzer Wärtsilä marine engine parts, overhaul components or replacement spares?
Send us your complete engine type, engine serial number, existing part number, part description, quantity and delivery destination. For older Sulzer engines, include photographs, drawing numbers or spare-parts catalogue references whenever available.
Our team can assist with sourcing parts for routine maintenance, urgent repairs and complete engine overhaul requirements.