Wärtsilä Marine
Spare Parts Supplier
Wärtsilä 20 · 32 · 34DF · 46 · 50DF · Sulzer
Wärtsilä engine models covered
Spare parts supply across the Wärtsilä medium-speed programme and legacy Sulzer two-stroke engines — serving main propulsion, generator drive, and dual-fuel applications.
Wärtsilä 20
Compact in-line auxiliary engine. Cylinder heads, piston rings, injection nozzles, camshaft bearings, turbocharger cartridges.
Wärtsilä 26
Auxiliary and propulsion diesel. Cylinder liners, exhaust valve assemblies, fuel pumps, crankshaft bearing shells, gasket sets.
Wärtsilä 32
Wartsila 32 RFQs can include piston crowns, cylinder heads, injection equipment, turbocharger nozzle rings and governor parts. Confirm exact engine and build evidence. Review the dedicated Wärtsilä W32 spare parts route.
Wärtsilä 34DF
Dual-fuel medium-speed engine. Standard mechanical parts — pistons, liners, cylinder heads, injection pumps — sourced on request.
Wärtsilä 46 · 46F
High-output main propulsion engine. Connecting rod assemblies, cylinder liners, exhaust valve cages, turbocharger stages and charge air components. Review the dedicated Wärtsilä 46 spare parts route.
Wärtsilä 50DF
Large-bore dual-fuel main engine. Cylinder kits, fuel injection components, exhaust system parts, cooling circuit spares.
Sulzer RTA Series
Legacy slow-speed main engines — RTA48T, RTA52U, RTA58T, RTA72U. Cylinder liners, piston rings, fuel pumps, exhaust valves, crosshead parts.
ZA40S
Medium-speed auxiliary and propulsion engine. Cylinder heads, fuel injection pumps, valve timing components, turbocharger parts, gasket sets.
What a Wärtsilä marine engine looks like in service
Reference photography of a Wärtsilä-built marine diesel and of a Sulzer RTA builder plate — the two things worth photographing before an RFQ is submitted.
Representative licensed photography, not a Vessel Core installed reference or completed job. Engine photo: S.J. de Waard, Wikimedia Commons, CC BY-SA 4.0. Builder plate photo: NAC, Wikimedia Commons, CC BY-SA 4.0. Vessel Core has no dealership, distribution or partnership agreement with Wärtsilä; it operates as an independent spare parts supplier.
Sulzer, Wärtsilä and WinGD: three names over one engine family
The medium-speed programme on this page — the 20, 26, 32, 34DF, 46 and 50DF — is Wärtsilä’s own, designed and supported by Wärtsilä. The two-stroke engines are a different story, and that story decides where a component is quoted from. Sulzer’s large-engine business in Winterthur became New Sulzer Diesel, which merged with Wärtsilä Diesel in 1997 to form Wärtsilä NSD and later Wärtsilä Corporation. For close to two decades the RTA and RT-flex engines were therefore sold, plated and catalogued as Wärtsilä Sulzer.
That changed on 19 January 2015, when the two-stroke business was transferred into a joint venture named Winterthur Gas & Diesel — WinGD — held seventy per cent by China State Shipbuilding Corporation and thirty per cent by Wärtsilä. Wärtsilä transferred its remaining shareholding to CSSC in 2016, and WinGD has been wholly CSSC-owned since. The engines themselves did not change. The company holding the design authority behind them did, and with it the catalogue an OEM-route line is confirmed against.
For a buyer this is not corporate trivia. A two-stroke plate in an engine room today can read Sulzer, Wärtsilä Sulzer or WinGD depending on when the engine was built, and the builder named on that same plate is usually none of the three: RTA and RT-flex engines have been built under licence in Japan, Korea and China — Diesel United, Hyundai Heavy Industries, Dalian Marine Diesel, Yichang and Hudong among them — as well as in Wärtsilä’s own works at Trieste. Three different names can appear on one engine without any of them being wrong. Send the plate as photographed rather than the brand as remembered.
Wärtsilä marine spare parts supply scope
Running spares, planned overhaul components and time-critical spare parts for common Wärtsilä and Sulzer engine requests, organised by system for clearer RFQ review.
- Cylinder heads & head gaskets
- Cylinder liners & O-ring sets
- Piston crowns, skirts & piston rings
- Exhaust valves, cages & seat rings
- Fuel injection pumps & plungers
- Fuel injector nozzle assemblies
- Turbocharger cartridges & nozzle rings
- Main bearings & crankpin shells
- Connecting rod bolts & big-end bearings
- Camshaft bearings & drive gear sets
- Charge air cooler elements
- Governors & speed control components
- Cooling water pump impellers & seals
- Overhaul gasket kits & seal sets
Reading a Wärtsilä plate down to a quotable line
A Wärtsilä type designation carries the cylinder count, the configuration and the bore, in that order: in 6L32 the 6 is the cylinder count, the L says the cylinders stand in line rather than in a V, and the 32 is the bore in centimetres. Suffixes do the rest of the work — DF for dual fuel, F for the uprated 46F. Two engines sharing a type designation can still take different components, because what separates them is the engine’s own build number rather than its type.
- Complete type designation as stamped, cylinder count and suffix included — 6L32, not 32
- Engine build or serial number from the Wärtsilä plate, photographed square-on
- Builder named on the plate, which on a two-stroke is usually a licensee rather than the design house
- Year of build, and the upgrade or retrofit level where the plate or the engine file carries one
- Duty: main propulsion, generating set or dual-fuel installation, and the fuel actually burned in service
- On a dual-fuel unit, whether the line sits on the gas train, on the pilot fuel side or on the common engine
- Cylinder number the component came off, for any running-gear line
- Part number and the part-book page it came from, treated as a starting point rather than a conclusion
- Bearing shells with the undersize stated, and ring sets quoted per cylinder rather than per ring
- Injector, injection pump and common-rail components separated by name, because the three are different orders
- Cylinder head written as a head, a complete cylinder unit or a valve set, since one word covers three scopes
- Turbocharger make and designation from its own plate, since it is a separate maker with a separate catalogue
- Governor or control-system make and software version where the line touches automation
- Running hours since the last overhaul, and any earlier reconditioning of the item itself
- Photographs of the engine plate and of the component in place
Multi-route review for Wärtsilä spare parts RFQs.
Vessel Core can review OEM-route and verified alternative supply options according to the exact part evidence, approval needs, available documentation and vessel timing. No availability or route is assumed before RFQ review.
Additional Routes for Non-Stock Items
For obsolete models, lower-volume variants or legacy Sulzer components, Vessel Core can review additional OEM-route and verified alternative options. Availability, documentation and lead time are confirmed only in the quotation.
OEM or Alternative — Your Choice
OEM-route review is available for class-critical work. Verified alternative components can be reviewed for running spares, with documentation requirements checked at RFQ stage.
Route and Budget Review
Verified alternative supply routes for Wärtsilä running spares can be reviewed when buyer approval allows it. Pricing, lead time, documentation and technical route notes are provided at RFQ stage.
Legacy Sulzer Support
Legacy Sulzer RTA and ZA40S requests often require a separate availability and documentation review. Vessel Core can assess OEM-route and verified alternative supplier options at RFQ stage, depending on part evidence, approval needs and vessel timing.
Port-Aware Delivery
Supply route, handover option and freight timing are reviewed against confirmed RFQ details, vessel ETA, port context, documentation needs and part availability before quotation. No fixed delivery commitment is made before availability and route are confirmed.
EU-Registered Entity
Vessel Core OÜ is registered in Estonia (Reg. 17028043, VAT EE102773714) with clear company details, RFQ contact and buyer verification routes.
Wärtsilä parts — common questions
Can you review verified alternative routes for Wärtsilä engines?
Yes. We review OEM-route and verified alternative routes for medium-speed Wärtsilä engine requests. Alternative routes are checked case by case for running spares and planned maintenance, while OEM-route review can be requested for class-surveyed or documentation-sensitive work.
What Wärtsilä engine models do you cover?
RFQs may reference Wärtsilä 20, 26, 32, 34, 34DF, 46, 50DF, legacy Sulzer RTA or ZA40S configurations. Provide the complete model, serial/build, installed duty and part evidence before a route is confirmed.
Can Vessel Core review additional routes for non-stocked Wärtsilä items?
For non-stocked, obsolete, or lower-volume parts, Vessel Core can review additional OEM-route and verified alternative options against the available evidence, approval needs and vessel timing. Lead time is confirmed only in the quotation.
Can you supply Wärtsilä DF engine parts — including gas system components?
Dual-fuel RFQs can include identified mechanical, fuel-system or turbocharger components. Gas-specific or control components require exact installed-system evidence, approval requirements and item-by-item route review at RFQ stage.
Submit your RFQ now.
Send your Wärtsilä spare parts request — vessel name, engine model (e.g. Wärtsilä 32), part numbers or descriptions, and port/ETA. Vessel Core reviews the supply route and prepares a structured supply quotation.
