Hyundai and Doosan Licence-Built
Two-Stroke Engine Parts
A MAN B&W or WinGD main engine built in Korea carries two identities: the designer's type, and the builder's name and works number. HD Hyundai Heavy Industries, HD Hyundai Marine Engine and Hanwha Engine, the former Doosan and HSD works, each keep their own engine numbers and part books, and an enquiry is read against both.
The Korean works behind licence-built main engines
These cards follow the builder rather than the design, because the builder is what the works number and the part book on board belong to. Two of the three works now trade under names that differ from plates already in service, and one name, HD Hyundai, now covers two separate works. For the design itself, the MAN parts route reads the type designation letter by letter.
ME-C · ME-GI · ME-GIE · ME-GA · ME-LGIM · ME-LGIP
Hyundai has built MAN B&W two-strokes under a licence signed in 1976, completing its first licensed engine in 1979, and its current list runs from the electronically controlled ME-C to the variants burning gas, ethane, methanol and LPG. The builder is Hyundai, the design MAN B&W, now branded Everllence B&W, and both belong in the enquiry.
X92 · X-DF · RT-flex82C · RT-flex DF
The same builder holds a WinGD licence covering sale, manufacturing and servicing, extended for ten years in 2017, and WinGD credits it with building the first RT-flex82C, RT-flex82T and X92 engines. A Hyundai builder name can therefore sit above a WinGD type as readily as above a MAN B&W one, and the two designs share no catalogue.
ME-C · ME-B · MC · ME-LGIP · ME-GA
The Changwon works that traded as STX Heavy Industries joined the HD Hyundai group in July 2024 as HD Hyundai Marine Engine. It builds MAN B&W low-speed engines through technical partnerships with Everllence and lists the world's first 6S40ME-B among its milestones. Engines from its STX years can carry that name in their documents, and its works numbers are its own, kept apart from the Ulsan works.
ME-GI · low-speed main engines
The works known as Doosan Engine traded as HSD Engine until Hanwha took control and renamed it Hanwha Engine in 2024. It builds MAN B&W low-speed engines, and Everllence named it in 2025 as the builder of ME-GI engines for LNG carriers; Hanwha also states that it was the first engine builder to commercialise a dual-fuel low-speed engine, in 2013. Plates in service can carry any of the three names, and a plate stamped under an older one keeps it.
NoNOx · DelNOx
Both builders also sell SCR systems of their own design for NOx reduction: HD Hyundai Heavy Industries under the NoNOx name, Hanwha Engine under DelNOx, which it brought to market in 2014. Neither is MAN B&W or WinGD equipment, so their parts are read against the builder's own documentation and kept off the engine lines.
HiMSEN
HiMSEN is Hyundai's own four-stroke design rather than a licence build, so its generating sets and propulsion engines have a page of their own. On a Hyundai-built ship the main engine and the gensets can follow two unrelated parts routes.
The wear is the design's; the part number is the builder's
A licence-built engine wears exactly as its design does. What changes is the book the replacement is ordered from. The cards below name the usual wear points and the identification step that matters on each when the builder is Korean.
Liner and ring-pack wear
Liner wear and broken rings are found at the scavenge-port inspection and confirmed by gauging the liner. Rings are quoted as a set per cylinder, and the set in the builder's book can carry a different number from the designer's drawing for the same groove profile.
Burnt seat and spindle face
A burnt seat or spindle face shows as one cylinder running a hotter exhaust than its neighbours. Say whether the line is the spindle, the bottom piece, the housing or the complete valve, and give the works number so the variant fitted at build is the one quoted.
Stuffing box and bearing shells
Worn scraper and sealing rings in the piston rod stuffing box let cylinder oil and residue into the crankcase, while bearing shells wear on a pattern of their own. Where the cylinder oil consumption is being followed, the cylinder oil feed rate calculator turns the oil used, the engine power and the running hours into a feed rate in g/kWh. Give the undersize already fitted and the cylinder number, counted from the end the builder's book counts from.
HCU and actuator leakage
On ME-C and ME-B engines the hydraulic cylinder units and their control valves typically show wear at their seals, as do the exhaust valve actuators on an ME-C. The label on the control valve itself identifies it more surely than the engine type, because two engines of one designation need not carry the same valve.
Gas and pilot fuel valves
GI, GA, LGIP and X-DF engines add gas or liquid-gas injection and admission valves, with pilot fuel valves, to the cylinder unit. These items follow the fuel: state the fuel suffix from the plate, and whether the engine was built dual-fuel or converted later.
Parts requested for Korean-built two-strokes
HD Hyundai Marine Engine groups its own two-stroke parts business under exhaust valve, fuel valve, fuel pump, piston, stuffing box, bearings, pipes and cylinder cover. That is a fair map of a typical enquiry; the list below follows the same engine from the cover down.
- Exhaust valve spindles, seats, bottom pieces and complete valves
- Cylinder covers, studs and nuts
- Cylinder liners, cooling jackets and liner O-rings
- Piston crowns, skirts, rods and ring sets
- Piston rod stuffing box rings and housings
- Fuel valves, nozzles and fuel pump parts
- Hydraulic cylinder unit and control valve items on ME-C and ME-B builds, exhaust valve actuators on ME-C
- Gas injection, gas admission and pilot fuel valve items on GI, GA, LGIP and X-DF builds
- Main, crankpin and crosshead bearing shells
- Starting air valves and cylinder relief valves
- High-pressure and hydraulic pipe assemblies with their seals
- Overhaul gasket, O-ring and seal kits
Reading a builder plate before the part book
A licence-built engine is identified twice: once by its design, once by the works that built it. The items below keep the two apart so that neither is lost on the way to a quotation.
- Builder name exactly as on the plate or the part-book cover (Hyundai, HD Hyundai, Doosan, HSD, Hanwha or STX), not today's company name
- The design brand beside it: MAN B&W, Everllence B&W, WinGD or Sulzer, which decides the design catalogue
- Full type designation with cylinder count, Mark number and any fuel suffix such as GI, GA, LGIM or LGIP, or the X-DF letters on a WinGD build
- The builder's engine or works number, which its part book is keyed to
- Year of build, and any later conversion, to dual fuel for example, recorded against the engine
- Which book is on board, the builder's or the designer's, with the relevant page photographed
- Part number as printed in that book, and any drawing number shown beside it
- Cylinder number and the end it was counted from, for any cylinder-unit or running-gear line
- Turbocharger make and type from the turbocharger's own plate
- Photographs of the engine plate, of any separate builder plate, 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. The marine fuel grade reader explains the ISO 8217 grade on the bunker delivery note, residual or distillate. For the main engine, the admiralty coefficient calculator works out the power for a new speed or displacement and the fuel per day and per mile. Where indicator cards are taken on the main engine, the indicated power calculator turns the pmi of each cylinder into power and shows how evenly the load is shared.
Supply route review for licence-built two-strokes
A licence-built engine gives an enquiry two registers to work from. The review settles which one a line belongs to before anything is priced, and keeps OEM-route and alternative options side by side.
Builder number or designer number
A part number copied from the builder's book and one taken from a designer's drawing can both be correct and still not match. Each line is read against the register it came from, and the source of the number is stated back in the reply.
A renamed works is still the same works
Doosan Engine, HSD Engine and Hanwha Engine are one works under three names; STX Heavy Industries and HD Hyundai Marine Engine are another under two. The plate name is matched to today's company before a route is chosen, so an older name is never a reason to start again.
Two works under one group name
HD Hyundai Heavy Industries and HD Hyundai Marine Engine both build MAN B&W designs and keep separate engine numbers. A works number only means something beside the right builder, so the two are never merged on one list.
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 equivalent-source route can be reviewed alongside it, with the difference in documentation stated rather than assumed.
Turbocharger and SCR on their own plates
The turbocharger and any SCR system of the builder's own design are separate equipment with their own plates and catalogues. They are identified from those plates, not from the engine type, and quoted as separate lines.
Hyundai and Doosan-built engines: questions buyers ask
My plate says Doosan, but the company is now Hanwha Engine. Which name goes in the enquiry?
The one on the plate. The works traded as Doosan Engine, then as HSD Engine, and since 2024 as Hanwha Engine; a plate stamped under the first name keeps it. Send the name as stamped with the works number, and the current company name is read alongside it rather than in place of it.
Is a Hyundai-built ME-C the same engine as one built by another licensee?
By design, yes: the type designation and Mark number describe the same MAN B&W engine. The part book is not necessarily the same, because each builder keeps its own engine numbers and can number an item differently. Send the designation, the builder and the works number together.
How do I tell whether a Hyundai-built engine is a MAN B&W or a WinGD design?
Read the type, not the builder. HD Hyundai Heavy Industries builds both, so an ME-C type, or one with a fuel suffix such as GI or LGIM, is a MAN B&W design, while X, X-DF, RT-flex or RT-flex DF is a WinGD one. The two designs share no catalogue.
Is HD Hyundai Marine Engine the same works as HD Hyundai Heavy Industries?
No. HD Hyundai Marine Engine is the former STX Heavy Industries in Changwon, part of the HD Hyundai group since July 2024; HD Hyundai Heavy Industries is headquartered in Ulsan. Both build MAN B&W designs, but each keeps its own works numbers.
Are HiMSEN gensets on a Hyundai-built ship covered here?
No. HiMSEN is Hyundai's own four-stroke design, not a licence build, and its parts follow a separate route; see HiMSEN engine parts. If an enquiry covers both the main engine and the gensets, send both plates.
Is Vessel Core connected to HD Hyundai / Doosan?
No, and there is no agreement of any kind. Vessel Core holds no distribution, representation or partnership agreement with HD Hyundai / Doosan, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability.
Send the plate, the works number and the page
An enquiry that carries the builder plate, the type as stamped and the part-book page can be read against the right register from the first reply. Partial evidence is still a starting point: send what you have.
