Main Engine 4-Stroke · Main Engines (4-Stroke)
Crew members, engineers, and operators on board ships depend heavily on reliable maritime equipment to ensure safe and efficient operations. Among them is Wärtsilä's 5LW25 engine, a part of their W25 family designed for modern marine applications. This 5-cylinder, 4-stroke diesel engine operates at 1000 revolutions per minute, delivering 875 kilowatts of power with heavy fuel oil or marine diesel oil (HFO/MDO). The engine is engineered to support both traditional and future fuels like ammonia (NH3) and liquefied natural gas (LNG), making it a versatile choice for vessels navigating the evolving maritime landscape. Regular maintenance, particularly focusing on high-pressure Common-Rail pump wear due to fuel contamination and piston ring wear during low-load operation, ensures optimal performance and reliability of this powerful propulsion solution.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
Free of charge — send us your request for Wärtsilä equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, Wärtsilä first.
Tell us what you need for this Wärtsilä 5LW25 — a part, a service call, a second opinion. Are you Wärtsilä? Claim this brand page.
Service engineer? Write the day report for this 5LW25 in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.