Mitsui-MAN B&W Engine
Spare Parts Supplier
Mitsui E&S has built B&W two-stroke main engines at Tamano under a licence signed in 1926, and since 2023 its group has also built WinGD engines as Mitsui E&S DU. The plate names a design and a builder; each enquiry is checked against the two of them, beginning with the engine number.
Engines and equipment from the Mitsui E&S works
Mitsui E&S builds the main engine and a good deal of what is mounted on it. For that main engine, the admiralty coefficient calculator relates the power to the speed and displacement of the ship, and gives the fuel per day and per mile. The cards below follow the prefix on the plate rather than the design alone, because the prefix names the builder as well as the design. How a B&W type reads letter by letter is set out on the MAN parts page.
S90ME-C · G95ME-C
Electronically controlled ME-C engines are what Mitsui's own milestone releases name: an 11S90ME-C10.5 in 2018 and a 7G95ME-C10.6-EGRTC in 2024. The Mark number after the designation and a suffix such as EGRTC are part of the type, and they decide which variant of an item fits.
ME-GI · ME-GIE · ME-LGIM · ME-LGIP
Mitsui lists dual-fuel B&W engines for methane, ethane, methanol and LPG, and records the first methanol dual-fuel engine anywhere in 2015 and the first ethane dual-fuel engine anywhere in 2016. GI and LGI valve items follow the fuel suffix, which is why it belongs in the enquiry.
MC
Mechanically controlled MC engines are the generation before ME, and Mitsui's main engine remote control series was supplied for both. On an MC engine the fuel pump, its roller guide and the camshaft drive do the work of the hydraulic items on an ME-C, so the generation changes the parts list as well as the type.
X · X-DF · X-DF-M · X-DF-A
Since April 2023 the former Diesel United works at Aioi has belonged to the group as Mitsui E&S DU, building WinGD designs. In 2026 the first WinGD engine was also completed at Tamano, a DU-WinGD 6X82DF-M-1.0 LP-SCR. A DU-WinGD plate is a WinGD design, so the X or X-DF type decides the catalogue, not the B&W one.
Pielstick four-strokes
Mitsui E&S DU also carries the S.E.M.T. Pielstick four-stroke line its predecessors built from 1965. These engines remain Pielstick designs: their parts are read on the SEMT Pielstick page, with DU named as the works.
TCT · MET-MB · MET-MBII · remote control
Mitsui builds TCT turbochargers, developed from the TCA, under an Everllence licence, and MET-MB and MET-MBII units under a Mitsubishi licence. Its group has delivered more than 4,500 main engine remote control systems of its own. Each of these carries its own plate and is quoted from it, never from the engine type.
Where a Mitsui-built two-stroke asks for parts
Built under licence, the engine wears the way any engine of its B&W or WinGD design wears. The after-sales page of the Mitsui E&S group, which runs from fuel valves, fuel pumps and roller guides to high-pressure pipes, fuel boosters and exhaust actuators, with welding repair of exhaust valve stems and seats, is a fair map of where enquiries start.
Burnt seat and spindle face
One cylinder running a hotter exhaust than the rest usually points to the seat or the spindle face. Because reconditioning by welding is on the group's own after-sales list, say whether a new spindle, a new seat or reconditioning of the fitted one is wanted, and whether the bottom piece is affected.
Atomiser and plunger wear
Worn atomisers, sticking valve spindles and plunger wear are behind most fuel-side lines. On an MC engine the fuel pump and its roller guide go together; on an ME engine the fuel booster takes their place. The generation therefore belongs in the request beside the cylinder number.
Broken rings and a worn liner
Scavenge-port inspection shows broken or sticking rings, and gauging confirms how far the liner has gone. Worn stuffing box rings let scavenge-space residue past the piston rod into the system oil. Ring sets are priced per cylinder, so give the count and the cylinders concerned.
Actuator and HCU seal leakage
On ME engines the exhaust valve actuator and the hydraulic cylinder unit wear at their seals, which shows as oil leakage or a slow valve. Photograph the label on the unit itself; two engines with one type designation need not carry the same build of it.
FBIV, PIV and FGV items
The Mitsui E&S after-sales page names dual-fuel valve items by the abbreviations FBIV, PIV and FGV. They follow the fuel the engine burns, so write the abbreviation as the part book prints it and add the fuel suffix from the plate.
Parts requested for Mitsui-built main engines
Mitsui groups its own parts supply into main engine parts, turbocharger parts, remote control and governor parts, and machinery around the main engine. The list below follows the same order, from the cylinder cover down to the equipment beside the engine.
- Exhaust valve spindles, seats, bottom pieces and complete valves
- Fuel valves, atomisers and fuel pumps
- Roller guides on camshaft engines
- Fuel boosters, exhaust valve actuators and hydraulic cylinder unit items on ME engines
- Dual-fuel valve items (FBIV, PIV, FGV) on GI, GIE, LGIM and LGIP engines
- High-pressure pipes with their seals
- Cylinder liners, piston crowns and ring sets
- Piston rod stuffing box rings
- Main, crankpin and crosshead bearing shells
- Turbocharger parts for TCT and MET-MB units
- Remote control and governor parts
- High-pressure LNG pump (MHP) items on ME-GI installations
Reading a Mitsui plate before the part book
A Mitsui-built engine is identified twice: by the design it was built to and by its own engine number. The items below keep both in view, together with the equipment that carries a plate of its own.
- The prefix exactly as stamped: MITSUI-MAN B&W, MITSUI-Everllence B&W, DU-WinGD or an older form
- The full type with cylinder count, Mark number and any suffix, such as 7G95ME-C10.6-EGRTC
- The engine number from the plate, which identifies the individual build
- Year of build, and the company name printed on the part book, which may be Mitsui Engineering & Shipbuilding, Mitsui E&S Machinery or MITSUI E&S
- Whether the engine is a camshaft MC or an electronic ME, where the type does not already show it
- The fuel suffix, and any later conversion recorded against the engine
- Part number and drawing number exactly as the part book prints them, with the page photographed
- Cylinder number for every cylinder-unit and running-gear line
- Turbocharger type from the turbocharger's own plate: TCT, MET-MB, MET-MBII or another make
- Photographs of the engine plate, of the remote control cabinet label where relevant, and of the part in place
Tools for this equipment: the Pt100 and thermocouple reader for the temperature sensors, the pressure gauge selector for the engine gauges and the O-ring size finder for loose O-rings. For the fuel the engine burns, the marine fuel grade reader decodes the ISO 8217 grade on the bunker delivery note. Where the main engine is a two-stroke, the cylinder oil feed rate calculator turns the cylinder oil used, the power and the hours into g/kWh. From the pmi on the indicator diagrams, the indicated power calculator gives the indicated power per cylinder and for the engine, with the bore and the stroke taken from the engine documents.
Supply route review for Mitsui-built engines
A Mitsui-built engine carries two sets of records, the designer's and the builder's, and often separate plates for the turbocharger and the control system. The review settles which records each line belongs to before anything is priced.
B&W or WinGD before anything else
The Mitsui group builds both designs, and they share no catalogue. The prefix and the type decide which one a line belongs to, so a DU-WinGD item is never read against a B&W book.
The engine number beside the type
The type narrows a line to a design family; the engine number narrows it to one build. Both are carried through the review and repeated in the reply, so the basis of each line is visible.
Older names on older documents
Documents from the Mitsui Engineering & Shipbuilding and Mitsui E&S Machinery years belong to the same engine business, and DU-Wärtsilä on an Aioi-built engine is the name DU gave its two-strokes before DU-WinGD. An older name is matched, not treated as a different maker.
OEM route and alternatives side by side
Where class, a warranty or the owner's approval list calls for the builder's or the designer's own part, that is the route quoted. For overhaul consumables an alternative route can be reviewed beside it, with the difference in documentation stated.
Turbocharger and remote control as separate lines
TCT and MET turbochargers and the remote control system are separate equipment with their own plates. They are identified from those plates and quoted as their own lines, even when the same group built them.
Mitsui-built engines — questions buyers ask
My plate says MITSUI-MAN B&W. Is it a MAN engine or a Mitsui engine?
Both, in different senses. The type is a B&W design, held today by Everllence, formerly MAN Energy Solutions, and Mitsui E&S built the engine under licence. Send the type with the engine number so the part is read against the design and the build together.
Newer documents say MITSUI-Everllence B&W. Is that a different engine?
No. MAN Energy Solutions now trades as Everllence, and Mitsui uses MITSUI-Everllence B&W as the brand for the same licence line. Mitsui's own releases still wrote MITSUI-MAN B&W in 2024, so either form can appear on an engine in service; send the one that is stamped.
The plate says DU-WinGD. Is that a Mitsui engine?
Since April 2023, yes: DU-WinGD is the prefix of Mitsui E&S DU, the former Diesel United at Aioi, which joined the Mitsui E&S group then. An older DU-WinGD engine was built by the same works while it belonged to IHI, and since 2026 WinGD engines are also built at Tamano. The design is WinGD either way, so the X or X-DF type decides the catalogue. For the WinGD generation before X, see Sulzer RT-flex parts.
Can turbocharger parts go on the same enquiry as the engine?
Yes, as separate lines. Mitsui builds TCT turbochargers under an Everllence licence and MET-MB units under a Mitsubishi licence, so a Mitsui-built engine can carry either, or another make. Send the turbocharger's own plate, because the engine type does not identify it.
The part book carries an older company name. Does that matter?
No. Mitsui Engineering & Shipbuilding, Mitsui E&S Machinery and MITSUI E&S are names of the same engine business at different dates. Send the book page as it is, with the engine plate, and the name is matched to the engine rather than treated as a separate maker.
Is Vessel Core connected to Mitsui E&S?
No, and there is no agreement of any kind. Vessel Core holds no distribution, representation or partnership agreement with Mitsui E&S, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Start from the Mitsui plate: the prefix, the type and the engine number
An enquiry that carries the prefix, the full type and the engine number can be read against the right design from the outset. If only part of that is to hand, send what you have.
