Wärtsilä Marine
Spare Parts Supplier
Wärtsilä 20 · 32 · 34DF · 46 · 50DF · Sulzer
Wärtsilä engine models covered
Vessel Core OÜ, an independent marine spare parts supplier in Tallinn, Estonia, quotes spare parts across the Wärtsilä medium-speed programme and legacy Sulzer two-stroke engines — main propulsion, generator drive and dual-fuel applications — and holds no agreement with Wärtsilä or WinGD.
Wärtsilä 20
Compact in-line engine for generating sets and for main propulsion, built in diesel and dual-fuel (20DF) versions. 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
Wärtsilä 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 based on the Wärtsilä 32 diesel, built from 6L to 16V as a generating set, a main engine or a mechanical drive. Pistons, liners and cylinder heads are quoted against the build; on the fuel side, say whether a line sits on the gas, the pilot fuel or the liquid fuel system.
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.
Sulzer RT-flex
The common-rail branch of the same two-stroke line. RT-flex replaced the RTA's camshaft-driven running gear with a common-rail supply unit, rail unit and separate injection and exhaust valve control units — four assemblies with no RTA equivalent, so an RTA part number does not cross over on any of them. See Sulzer RT-flex 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 in early 2015, when Wärtsilä Switzerland, the company responsible for the two-stroke engines, was merged with China State Shipbuilding Corporation (CSSC) and renamed Winterthur Gas & Diesel — WinGD. Wärtsilä transferred its remaining shares 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. Wärtsilä did not disappear from the picture, though: WinGD names Wärtsilä Services Switzerland as its global service partner for spare parts, field service and reconditioning, under an agreement renewed in January 2018, and WinGD also supplies original parts for its engines itself — so a buyer on a WinGD design can meet either name on the service and parts side.
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.
Crosshead and trunk-piston part books differ
This page carries both kinds of engine, and their part books are not built the same way. Where a trunk-piston engine lists a single piston, a crosshead engine lists crown, skirt, piston rod and crosshead parts separately, so one word on a requisition can be one line or several.
The medium-speed part book
Complete pistons, crowns and skirts, liners, and ring sets that include oil scraper rings as well as compression rings. The piston rod and crosshead parts that a slow-speed part book carries are not listed separately here.
The two-stroke part book
The piston is written as crown, skirt and piston rod, each on its own line, with crosshead shoes and guides, the crosshead bearing and the stuffing box beside them. A request that says only "piston" has not yet said whether it means the crown, the skirt, the rod or all three.
Say which book each line came from
When one list mixes trunk-piston and crosshead items, send the part-book page each line was read from and the engine it belongs to. Both engine types are accepted, and the build is confirmed before matching.
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 & small-end bushes
- 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 46F series (whose dual-fuel member is the 46DF), TS for the two-stage turbocharged 46TS. 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 make 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
Three groups the engine plate does not settle
The engine plate identifies the engine. The turbocharger, the governor or control system and the injection equipment each need identifying in their own right before a line on them can be quoted.
A separate maker, a separate catalogue
The turbocharger has its own plate, its own manufacturer and a catalogue separate from the engine. Read its make and designation off that plate, not off the engine plate. On a Wärtsilä 46, say as well whether the turbocharging is single-stage or the two-stage arrangement carried by the TS platform, because the charge air side is laid out around it.
Its own make, type and software
Where a line touches speed control or automation, the governor or control system is identified by its own make, type and software version, not by the engine plate alone. The engine plate still goes with it: a governor is quoted against the engine it controls, and the same governor family is fitted to machines of very different size and duty.
Three orders under one word
Injector, injection pump and common-rail components are three different orders, so each is written out by name. Two-stroke injection hardware can carry a second reference as well: L'Orange supplies injection valves, pumps and nozzles as original equipment into WinGD/Sulzer two-strokes, so the same part may be listed under the drawing number of the engine builder and again under the type and version marking on its body.
When the Wärtsilä plate is not on an engine
This page is about engines. The Wärtsilä name also appears in the engine room on equipment the company owned for a period and in several cases has since sold, because the branding on a unit tracks the ownership of the day it was built. Wärtsilä took control of Hamworthy plc on 31 January 2012, so pumps, inert gas systems, wastewater plants and freshwater generators delivered after that date can carry a Wärtsilä plate for a product line that has since passed to another company. Those plates are routed on the Hamworthy page, which sets out who supports each equipment class today.
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 Rare 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. We review verified alternative components for running spares, with documentation requirements checked at RFQ stage.
Route and Budget Review
We review verified alternative supply routes for Wärtsilä running spares 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, 25, 26, 31, 32, 34, 34DF, 46, 46F, 46DF, 46TS-DF, 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 rare Wärtsilä items?
For rare, 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.
Our Sulzer RTA plate reads Wärtsilä Sulzer or WinGD. Is it the same engine?
Yes. Three names can sit on one two-stroke without any of them being wrong. New Sulzer Diesel merged with Wärtsilä Diesel in 1997, so RTA and RT-flex engines were sold and plated as Wärtsilä Sulzer for close to two decades; in 2015 the two-stroke business passed to Winterthur Gas & Diesel, WinGD, wholly owned by CSSC since 2016. The engines did not change, but the holder of the design authority did, and with it the catalogue an OEM-route line is confirmed against. The builder on the same plate is often a licensee, so send the plate as photographed.
A pump or freshwater generator on board carries a Wärtsilä plate. Is it covered here?
Not on this page, which covers Wärtsilä engines. Wärtsilä took control of Hamworthy plc on 31 January 2012, and pumps, inert gas systems, wastewater plants and freshwater generators delivered after that date can carry a Wärtsilä plate even where the product line has since passed to another company. Plates of that kind are read on the Hamworthy page, which shows who supports each equipment class today.
Is Vessel Core connected to Wärtsilä?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with Wärtsilä, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
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.
