Wärtsilä · marine engine

Wärtsilä W31 Spare Parts

Genuine and Alang-reconditioned spare parts for the Wärtsilä W31 — main propulsion on ferries, osvs, tankers, lng-fuelled bulkers; aux genset on large cruise ships, lng carriers. Shipped from Bhavnagar, India to any port worldwide.

Parameter	W31
Bore	310 mm
Stroke	430 mm
Configuration	In-line 8L, 10L (and V configurations 12V, 14V, 16V on SG/DF)
Power	4.6–10.4 MW (650 kW/cyl diesel; 590/610 kW/cyl DF; 530–600 kW/cyl SG)
Speed	720 / 750 rpm
MEP	~30+ bar (highest in class)
SFOC	165–170 g/kWh diesel @ ISO (best in class at introduction)
Fuel	Diesel (LFO / HFO / biofuel); DF (LNG + pilot); SG (pure gas, lean burn)
Status	🟢 Current (introduced 2015 — Guinness "World's most efficient 4-stroke")
Production years	2015–present
Application	Main propulsion on ferries, OSVs, tankers, LNG-fuelled bulkers; aux genset on large cruise ships, LNG carriers

Figures as published for this engine. Where a value is not published by the maker, this page says so rather than estimating it.

W31 Spare Parts We Supply

Cylinder heads (4-valve)
piston crowns (cooled)
liners
exhaust valves
fuel injectors (common rail)
2-stage turbochargers (ABB TPL-C / Napier next-gen)
aftercoolers
governors / WECS
bearings
camshaft segments

Genuine, OEM-equivalent and Alang-reconditioned. Every reconditioned part is measured against the maker’s limits before it leaves us. If a part is not listed, send the engine and part number — most Wärtsilä items are sourceable.

About the Wärtsilä W31

The W31 runs a 310 mm bore and 430 mm stroke. Status: 🟢 Current (introduced 2015 — Guinness "World's most efficient 4-stroke"). Built 2015–present. Application: Main propulsion on ferries, OSVs, tankers, LNG-fuelled bulkers; aux genset on large cruise ships, LNG carriers

Source: wartsila.com W31 page / W31 brochure PDF / manualslib W31 product manual

Why Source W31 Parts from Wattmare?

We are in Bhavnagar, next to Alang — the world’s largest ship-recycling yard. That is where reconditioned main-engine parts actually come from. We hold fast-moving items, source the rest through the yard and our trader network, and dispatch worldwide in 24–48 hours on emergency orders.

Salim Dholia
Wattmare · Bhavnagar / Alang, India

View All Wärtsilä Models

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Frequently Asked Questions

What Wärtsilä W31 spare parts do you supply?

Genuine, OEM-equivalent and Alang-reconditioned parts for the W31, including Cylinder heads (4-valve), piston crowns (cooled), liners, exhaust valves, fuel injectors (common rail). Send the engine and part number for anything not listed.

What is the delivery time for W31 parts?

Stock items dispatch the same or next working day from Bhavnagar. Emergency orders ship in 24–48 hours to any major port. Sourced items depend on the yard — we confirm a real date before you commit.

Are your W31 parts genuine or reconditioned?

Both. We supply genuine and OEM-equivalent new parts, and Alang-reconditioned parts measured against the maker's limits before dispatch. We tell you which you are buying — we do not sell reconditioned as new.

Need W31 parts?

Send the engine number and part number. We quote with a real availability date, not a maybe.

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