China State Shipbuilding Corporation (CSSC) operates the largest marine engine production network in the world. Its subsidiaries collectively build approximately 30% of global slow-speed two-stroke marine engine output by kilowatt, supply the majority of China’s own shipyards, and hold the unique distinction of owning WinGD, the Swiss design house that develops the WinGD engine family alongside MAN Energy Solutions as one of the two dominant global two-stroke design licensors. This article covers the corporate history of CSSC’s marine engine enterprises, from the original 1978 licensing agreements through the 1999 split into CSSC and CSIC, the formation of joint-venture builders in the 2000s, the 2015-2016 WinGD acquisition, the 2019-2020 merger of the two groups, and the current structure in which six principal builders operate under one state-owned umbrella.
The engine-building enterprises examined here are part of a broader industry covered on this site’s marine engine makers hub. The two-stroke technology each builder licenses is covered in two-stroke marine diesel engine fundamentals. For the thermal-efficiency calculations that define how these engines perform, the engine brake thermal efficiency calculator and the SFOC sensitivity to air temperature calculator are directly applicable.
Origins: the 1978-1980 license agreements
China’s entry into licensed two-stroke marine engine production dates to the late 1970s, when Deng Xiaoping’s reform program opened industrial sectors to Western technology transfer. Two agreements established the foundation for everything that followed.
In 1978, Hudong Heavy Machinery (then operating as part of the Hudong Shipyard complex in Shanghai) signed a license agreement with Sulzer Brothers of Switzerland for the right to manufacture Sulzer RTA-series slow-speed two-stroke engines. This was China’s first major marine propulsion technology-transfer agreement with a European OEM. Two years later, in 1980, Hudong signed a separate agreement to manufacture B&W (later MAN B&W) licensed engines, making it the first Chinese builder to hold the B&W patent for slow-speed engines.
Dalian Marine Diesel Works (DMD) in northeast China followed a similar path, commencing licensed production in 1981. Between 1981 and mid-2002, DMD built 198 licensed engines under MAN B&W and Sulzer/Wartsila agreements, delivering a cumulative output of more than 2 million kW to Chinese yards.
These early agreements were straightforward technology-for-market deals. The Chinese builders received engineering drawings, specifications, and manufacturing support from the European design houses. In return, the design houses gained access to the rapidly growing Chinese shipbuilding order book without having to establish their own production facilities in China. The model was identical in structure to the licensee arrangements that the same OEMs had established in Japan (Mitsui, Kawasaki, Mitsubishi) and Korea (Hyundai, Hanjin/HHI) in the preceding decades, as documented in the marine engine makers hub.
The 1982-1999 unified corporation era
The original “China State Shipbuilding Corporation” was established in 1982 as a single unified state enterprise controlling all of China’s shipbuilding and marine engineering assets, including the engine factories at Hudong (Shanghai), Dalian, Yichang, and Zhenjiang. This corporation signed the 1978-1980 license agreements in the years immediately before its formal establishment and managed them through the 1980s and 1990s.
The unified corporation’s engine production grew steadily through this period, but remained secondary in scale to the Korean builders (Hyundai, Hanjin, Doosan) who were expanding aggressively through the 1980s boom. Chinese yards faced quality-control challenges and had not yet achieved the throughput times that Korean yards had established.
The 1999 split: CSSC and CSIC formed
On July 1, 1999, as part of the Chinese government’s broader reform of state-owned enterprises, the original unified corporation was divided into two competing entities.
CSSC (China State Shipbuilding Corporation, retaining the original abbreviation) kept the southern and eastern shipbuilding assets, principally along the Yangtze River delta: Hudong-Zhonghua Shipbuilding in Shanghai, Jiangnan Shipyard in Shanghai, and the engine factories at Hudong and Zhenjiang.
CSIC (China Shipbuilding Industry Corporation, the new entity) received the northern and inland assets: Dalian Shipbuilding Industry Co. (DSIC), the engine factories at Dalian and Yichang, and a collection of research institutes concentrated in Beijing and Wuhan. CSIC was established formally in Beijing on July 1, 1999, the same date as the split.
The policy rationale was competition. Two separate state-owned groups bidding against each other for international orders, and separately managing their own engine supply chains, was expected to drive efficiency gains. For two decades the approach worked in the sense that both groups expanded. CSSC became the anchor for the Shanghai and Yangtze-delta yards. CSIC dominated the northeast, with Dalian as its principal shipbuilding base.
The 1999 split also divided the engine licensee relationships. HHM and the Zhenjiang builders remained in the CSSC group. DMD, YMD, and the subsequently established Qingdao facility fell under CSIC. This division persisted until the 2019-2020 merger, which is why the Everllence (MAN B&W) licensee list from 2015 listed “CSSC affiliates” and “CSIC affiliates” as distinct categories.
Building out capacity: the 2000s joint-venture era
The 2000s saw both groups establish new capacity through joint-venture structures, bringing Japanese partner capital and engineering expertise into the Chinese production base.
CMD formation (2006)
CSSC established CSSC-MES Diesel Co., Ltd. (CMD) in 2006 as a joint venture among China State Shipbuilding Corporation, the listed China CSSC Holdings Ltd, and Mitsui Engineering & Shipbuilding Co., Ltd. of Japan. The “MES” in the name refers to Mitsui Engineering & Shipbuilding. CMD built its factory in the Lingang heavy-equipment production area south of central Shanghai, close to the Hudong-Zhonghua shipyard complex.
CMD was conceived specifically to add capacity to the Shanghai engine production base. The facility was designed from the start for large-bore two-stroke production. By 2008, CMD already had an order book aggregate above 960 MW and was projecting annual output above 2,200 MW by 2011. The MAN B&W license was its primary product line. The Wartsila/Sulzer license (covering RTA and RT-flex engines, the precursors to the WinGD X-series) was added the same year: in December 2008, Wartsila and CMD signed a separate license agreement for low-speed engine manufacture at the Lingang facility.
QMD formation (2006/2009)
CSIC took a different structural approach for its third production base. In September 2006, CSIC, Wartsila Corporation, and Mitsubishi Heavy Industries established a three-way joint venture in Qingdao: Qingdao Qiyao Wartsila MHI Linshan Marine Diesel Co., Ltd. (subsequently simplified to Qingdao Haixi Marine Diesel Co., Ltd., or QMD). The plant reached operational capability around 2009, with an initial annual production capacity of approximately 1.2 million brake horsepower, expandable to about 3.5 million bhp.
QMD was unusual in holding three design-house licenses simultaneously: Wartsila/Sulzer, MAN B&W, and J-ENG (the Mitsubishi UE two-stroke design, the same engine covered in Mitsubishi UEC two-stroke engines). MAN Diesel & Turbo added QMD as a licensee in a February 2015 agreement, rounding out QMD’s license portfolio.
WinGD: from Wartsila spinout to CSSC subsidiary
The WinGD story runs through these same years and is inseparable from the CSSC engine-group narrative.
The design heritage now branded as WinGD traces to Sulzer Brothers in Winterthur, Switzerland, whose first marine two-stroke engine entered service in 1910. Sulzer’s diesel operation became New Sulzer Diesel Ltd. in November 1990, then merged with Wartsila Diesel Oy in April 1997 to form Wartsila NSD Corporation, which was subsequently absorbed into Wartsila Corporation. Wartsila Switzerland Ltd. became the operating entity for low-speed two-stroke design within the Wartsila group.
In early 2015, Wartsila Switzerland Ltd. merged with CSSC to form a joint venture renamed Winterthur Gas & Diesel Ltd., branded WinGD. CSSC held 70% from the outset; Wartsila retained 30%. The WinGD brand superseded the Wartsila two-stroke identity, and the engine family was rebranded from the RT-flex and Generation X lines to the WinGD X-series. The full technical history of that transition is covered in WinGD corporate history.
In June 2016, Wartsila transferred its remaining 30% shareholding to CSSC, making WinGD 100% CSSC-owned. The transfer was announced publicly and confirmed by both Wartsila and CSSC. A Wartsila-WinGD service agreement covered continuity of after-sales support; Wartsila extended that agreement in January 2018 for a further 10 years, separating the design and production ownership question from the service-network question.
The acquisition gave CSSC something no other shipbuilding group had in the marine engine industry: a wholly-owned design house with an active global license model. MAN Energy Solutions (Everllence), the competing two-stroke design house, is not owned by any shipbuilder; it is a subsidiary of Volkswagen Group. CSSC’s position means it simultaneously collects license royalties from non-Chinese builders (Korean and Japanese licensees of WinGD) and builds WinGD engines itself in its own Chinese factories.
The 2012-2022 license renewals
In December 2012, seven Chinese companies signed simultaneous 10-year license renewal agreements with Wartsila (covering RTA, RT-flex, and Generation X engines) running from 2013 to 2022.
Four were CSSC group companies: HHM, CMD, Zhenjiang CME (the predecessor name of CSSC Marine Power), and CSSC Guangzhou Marine Diesel Co., Ltd. (GMD, a smaller facility not separately profiled here).
Three were CSIC group companies: DMD, QMD, and YMD.
The simultaneous renewal reflected the maturity of the Chinese licensee system and the scale of the Chinese order book by the early 2010s. Chinese yards at that point accounted for roughly 40% of global new-building completions by tonnage, and a substantial fraction of those ships needed two-stroke main engines. The seven Chinese licensees were no longer minor production satellites of the European design houses; they were the largest collective block of licensed production in the world.
At the same time, February 2015 saw MAN Diesel & Turbo sign a separate 10-year agreement with CSSC affiliates (CMD, HHM, and CMP) and CSIC affiliates (DMD, YMD, and QMD) for continued MAN B&W low-speed engine production.
The 2019 re-merger: CSSC absorbs CSIC
SASAC, China’s state asset supervisor, approved the re-merger of CSSC and CSIC in October 2019. The formal structural merger was announced in November 2019 and the reorganization completed in September 2020, with the combined entity retaining the CSSC name and abbreviation.
The combined group became the world’s largest shipbuilding enterprise by assets (approximately US$110 billion) and by annualized tonnage output. Its shipyard roster includes Hudong-Zhonghua, Jiangnan, Shanghai Waigaoqiao (SWS), Dalian Shipbuilding Industry (DSIC), Guangzhou Wenchong, Guangzhou Huangpu, and more than a dozen secondary yards. Its engine roster brought together all the builders that had been split in 1999.
For the engine subsidiaries, the re-merger meant that HHM, CMD, CMP (CSSC origin) and DMD, YMD, QMD (CSIC origin) now operated within one corporate structure. The internal-competition rationale for the 1999 split was abandoned in favor of coordination. Internal negotiating positions between engine builders and internal yards, and between the design house (WinGD) and its Chinese licensees, were now internal to a single corporation.
In August 2022, CSSC announced a further consolidation of the diesel engine segment: China Shipbuilding Industry Group Power Co., Ltd. (the listed entity for power equipment within the group) would acquire diesel engine assets from other CSSC units in a deal valued at 22.63 billion yuan (approximately US$3.3 billion). The stated objectives were to eliminate internal competition and strengthen the group’s negotiating position on propulsion supply.
CSSC Engine Co., Ltd. (CSE): the CSIC heritage grouping
The former CSIC three-factory complex (DMD, YMD, QMD) was reorganized into a dedicated holding company before the broader group merger was fully settled.
In 2017, CSIC integrated DMD, YMD, and QMD into a single entity called China Marine Diesel Engine (holding the English abbreviation CMDE). Headquarters was placed at Qingdao, reflecting QMD’s geographic position. The structure was described as “one headquarters plus three bases.”
On March 15, 2023, the holding company was renamed China State Shipbuilding Engine Co., Ltd. (abbreviated CSE, also rendered CSSC Engine). The renaming aligned the entity’s branding with the post-merger CSSC parent. CSE holds production licenses for MAN B&W (Everllence), WinGD, and J-ENG (formerly Mitsubishi UE), giving it the broadest license portfolio of any CSSC engine sub-group: the three competing two-stroke design lineages under one holding structure.
By December 2023, CSE’s combined annual output broke 4 million horsepower (approximately 2,983,000 kW) for the first time, announced at the delivery of a CSB742/6S60ME-C10.5+HPSCR engine. The achievement covered dual-fuel variants: in 2023 alone, CSE delivered more than 200 sets of SCR high-pressure dual-fuel main engines and delivered the world’s first 7S35ME-C9.7-GI+EcoEGR LNG dual-fuel engine, filling what the group described as a gap in the small-bore LNG dual-fuel engine lineup.
The six principal builders
The current CSSC engine production network consists of six principal two-stroke builders and one medium-speed builder.
Hudong Heavy Machinery Co., Ltd. (HHM)
HHM is China’s oldest and largest low-speed marine engine manufacturer. It operates from the Hudong-Zhonghua complex in Pudong, Shanghai, covering more than 400,000 square metres of manufacturing floor with dedicated heavy-machining, assembly, and test facilities.
HHM is the earliest Chinese enterprise to hold the MAN B&W patent license (from 1980) and the Sulzer/WinGD license (from 1978 under the original Sulzer agreement). Since the Sulzer license era, HHM has built more than 2,000 MAN B&W two-stroke engines across its production history. Annual production capacity exceeds 4 million horsepower (roughly 2,983,000 kW). HHM is the only builder in China that holds both the MAN B&W (Everllence) and the WinGD license simultaneously at a single facility, and it builds the full bore range from 35 cm to 98 cm for MAN B&W types and 48 cm to 96 cm for WinGD types.
HHM was the first Chinese licensee to book orders for the MAN B&W ME electronically controlled engine in August 2003. By mid-2004 it had completed more than 460 MAN B&W engines aggregating 4.4 million kW of cumulative licensed output.
Given CSSC’s ownership of WinGD, HHM’s WinGD production relationship involves a closer coordination than a conventional licensee arrangement. WinGD engineers work with HHM on production ramp-up for new engine variants. HHM was part of the production team that brought X-DF (dual-fuel LNG) engines into volume production in China, supplying LNG carriers built at Hudong-Zhonghua for Chinese and international owners including orders for COSCO, MOL, and Maran Gas.
HHM supplies primarily the shipyards of the CSSC group: Hudong-Zhonghua (co-located on the same complex), Jiangnan Shipyard, and Shanghai Waigaoqiao. Some output goes to non-CSSC Chinese yards, and a small export flow has historically gone to non-Chinese yards in special-project circumstances.
CSSC-MES Diesel Co., Ltd. (CMD)
CMD operates from the Lingang heavy-equipment production zone in Shanghai’s Pudong district, approximately 40 kilometres south of the Hudong-Zhonghua complex. It was established in 2006 and holds MAN B&W and WinGD licenses for the same two-stroke product range as HHM.
CMD’s position within the CSSC engine system is as the second major Shanghai production center, adding capacity to HHM without geographically duplicating it. Its Lingang location puts it adjacent to Shanghai Waigaoqiao Shipbuilding (SWS) and the Lingang new-building areas, giving logistical advantages for those yards.
CMD’s most visible milestone to date was the world-first delivery of the 9X92DF-2.0 iCER dual-fuel main engine on March 13, 2023. The engine, a 9-cylinder 92-cm bore WinGD X-DF2.0 with iCER (Intelligent Control by Exhaust Recirculation) technology, was built for a 13,000 TEU container ship constructed by Hudong-Zhonghua for CMA CGM. The iCER system reduces methane slip during LNG-mode operation by approximately 50% compared to the first-generation X-DF, making it a key technology for methanol and LNG as marine fuels and IMO emissions compliance. At the time of delivery, 26 sets of 9X92DF-2.0 engines were on order globally, and all were contracted to CSSC Power Group for production: CMD held the full production mandate for the world’s largest WinGD dual-fuel variant at that point.
CMD followed this with the world’s first delivery of the 10X92DF-M-1.0-LPSCR methanol dual-fuel engine on February 26, 2025. The 10-cylinder, 92-cm bore X-DF-M engine, with a maximum design power of 64,500 kW, passed both factory and type approval tests at the Lingang facility with eight classification societies present for certification. The engine was installed on the fourth vessel in a series of 16,000 TEU container ships being built for COSCO Shipping Lines. With 56 X-DF-M engines on order across bore sizes from 52 to 92 cm, CMD’s role as the launch production site for the platform gave it a first-mover position in methanol dual-fuel main engine manufacturing. The methanol marine engines overview covers the thermodynamic context for this engine family.
Dalian Marine Diesel Co., Ltd. (DMD)
DMD was established on July 1, 1977, making it the oldest purpose-built marine diesel engine factory among the CSIC-heritage builders. Located in Dalian in Liaoning province, northeast China, it was originally part of CSIC and is now within CSSC via both the 2020 merger and the CSE holding-company structure.
DMD’s initial licensed production from 1981 covered MAN B&W and Sulzer designs. The factory built 198 licensed engines aggregating more than 2 million kW between 1981 and mid-2002, with Sulzer RTA-series camshaft engines as a particular specialization. Annual capacity in the early 2000s was approximately 600,000 kW, subsequently expanded.
DMD currently produces the full range of MAN B&W and WinGD two-stroke types. Its Dalian location serves two strategic purposes: supply of the Dalian Shipbuilding Industry Co. (DSIC) complex on the same waterfront, and coverage of the broader northern-China shipbuilding cluster (including yards in Tianjin and Bohai Bay).
DMD’s most documented recent milestone was the delivery of the world’s first WinGD 6X62-S2.0 HPSCR main engine in March 2024, installed on a pulp carrier built at COSCO Dalian for a Chinese owner. The 6X62-S2.0 is the inaugural model of WinGD’s short-stroke X-S series, which delivers approximately 10 g/kWh lower specific fuel oil consumption (SFOC) than comparable RT-flex engines at equivalent operating profiles, a roughly 4% efficiency gain. The WiCE (WinGD Intelligent Control by Engine) main engine control system was fitted for the first time on this delivery. The SFOC sensitivity calculator and engine brake thermal efficiency tool are applicable to evaluating this class of efficiency improvement.
DMD also delivered China’s first methanol dual-fuel low-speed main engine on July 4, 2025: the 7G80ME-C-LGIM-EGRTC for a 306,000 DWT VLCC being constructed at DSIC for China Merchants Energy Shipping. In methanol mode, the engine achieves 50% lower nitrogen oxide emissions, 97% lower sulfur oxide emissions, 90% lower particulate matter, and approximately 5% lower greenhouse gas output compared to conventional fuel operation. Since 2024, DMD has delivered 14 methanol dual-fuel engines across multiple types to yards including Guangzhou Shipyard International and China Merchants Energy Shipping. The broader context for this engine’s emissions profile is in ammonia as marine fuel and methanol as marine fuel.
Yichang Marine Diesel Engine Co., Ltd. (YMD)
YMD is located in Yichang, Hubei province, in central China, approximately 1,000 kilometres inland from Shanghai and 1,500 kilometres southwest of Dalian. Its geographic position makes it unusual among marine engine factories, which are almost universally coastal or at major river-port locations.
YMD holds MAN B&W, WinGD, and J-ENG licenses, covering two-stroke engines from 7,275 kW to 21.24 MW. Annual production capacity in the early 2010s was approximately 370,000 kW; the facility has been expanded since. YMD is now one of the three production bases under the CSE holding structure.
YMD’s inland location was strategically rational for the CSIC period because it served the Wuhan and Yangtze-corridor shipbuilding cluster, notably Wuchang Shipbuilding Industry Group and other Hubei-based yards. Engine deliveries travel by river barge from Yichang to downstream yards, making the Yangtze navigation corridor the logistical link. After the 2019-2020 merger, YMD’s supply relationships extend to CSSC-group yards reachable by river.
YMD was part of the initial engine-production group that in 2014 collectively had capacity of approximately 8.5 million horsepower (roughly 6.3 million kW) across five Chinese companies, as reported in industry trade assessments of that period.
Qingdao Haixi Marine Diesel Co., Ltd. (QMD)
QMD, the newest of the three CSE-held production bases, was established in September 2006 as a three-way joint venture among CSIC, Wartsila Corporation, and Mitsubishi Heavy Industries. Construction of the Qingdao facility was completed in 2009, when MHI, Wartsila, and CSIC held a formal inauguration.
The plant was designed specifically for large-bore two-stroke production at modern cycle times, with an initial rated capacity of approximately 1.2 million brake horsepower and a design expansion capacity of 3.5 million bhp. Its license portfolio from inception covered Wartsila (Sulzer RT-flex and Generation X) and Mitsubishi UE (now J-ENG) designs. MAN Diesel & Turbo added QMD as a licensee in February 2015, completing a three-brand license position.
QMD’s Qingdao location (Haixiwan shipbuilding and repair industrial base, Qingdao West Coast New Area) serves the northern China shipbuilding cluster and provides production redundancy to DMD in Dalian. After the CSE consolidation, QMD functions as the Qingdao base of the “one headquarters plus three bases” structure, with CSE’s headquarters co-located at Qingdao.
CSSC Marine Power Co., Ltd. (CMP)
CMP in Zhenjiang, Jiangsu, is the oldest entity in the current engine-builder roster by corporate lineage, though its product focus differs from the five two-stroke builders above: CMP specializes in medium-speed four-stroke engines while also holding a WinGD two-stroke license.
CMP’s predecessor was Zhenjiang Marine Diesel Works (ZJMD), founded in 1976. ZJMD signed a 15-year medium-speed engine licensing agreement with MAN (then MAN B&W Diesel) in May 1980, which was extended in 1995 and again in 2005. In September 2013, the company was renamed from Zhenjiang CME Co., Ltd. to CSSC Marine Power Co., Ltd., adopting the CSSC group branding.
CMP has delivered more than 5,000 units of MAN four-stroke diesel engines, totaling approximately 4,700,000 kW of cumulative output. Its licensed product range covers MAN medium-speed types (L16/24, L21/31, L27/38, L23/30H, L28/32H, V28/32H), Daihatsu DK, DC, and DE series, and MAK series engines, spanning a power range from 400 kW to 19,020 kW. This range positions CMP as the primary CSSC supplier for auxiliary and generator-set applications in addition to some propulsion roles. CMP holds a WinGD two-stroke production license as well as the MAN four-stroke licenses, making it technically capable across both the main-engine and generator-set markets.
The Everllence licensee list identifies CMP as the holder of the MAN four-stroke (F) license at Zhenjiang.
The two-brand license model
Every CSSC group engine builder operates under the same fundamental commercial structure: a design-house license, royalty payments per engine unit, and compliance with the OEM’s quality-assurance and type-approval regime. The builder receives design drawings, specifications, and manufacturing standards from the licensor. Each engine delivered carries the designation of both the builder (e.g., HHM, CMD, DMD) and the design house (MAN B&W or WinGD), separated by a hyphen or slash in the commercial and type-designation strings.
The economics of CSSC’s WinGD ownership create an unusual triangularity. For WinGD-licensed engines built at CSSC factories, the royalty that would otherwise flow to an independent design house circulates within the same corporate group. The commercial terms are still documented in inter-company agreements and are not publicly disclosed, but the intragroup nature of the relationship gives CSSC flexibility in pricing and production-allocation decisions that no purely independent licensee could match.
For MAN B&W (Everllence) engines, the royalty flows externally from CSSC to MAN Energy Solutions in Germany, a subsidiary of Volkswagen Group. The Everllence licensee list confirms HHM as a two-stroke licensee (both T and F types, meaning two-stroke and four-stroke), CMD as a two-stroke licensee, DMD as a two-stroke licensee, YMD as a two-stroke licensee, QMD as a two-stroke licensee, and CMP as a four-stroke licensee.
The two-brand structure also gives the CSSC group flexibility in responding to yard preferences. Certain yards or owners specify MAN B&W engines; others specify WinGD. A yard contracting with an CSSC-group engine builder can be supplied from either license stream depending on order specifics, yard equipment preferences, or delivery-slot availability. This cross-license versatility is shared with Korean builders like HHI-EMD and Hanwha Engine, which also hold both MAN B&W and WinGD licenses, but no other engine builder holds WinGD licenses from within the same corporate ownership chain as WinGD itself.
Subsidiary comparison table
| Builder | Location | Established | License brands | Primary bore range | Key product lines |
|---|---|---|---|---|---|
| HHM (Hudong Heavy Machinery) | Shanghai, Pudong | 1978/1980 (license start) | MAN B&W, WinGD | 35-98 cm (MAN B&W), 48-96 cm (WinGD) | ME-C, ME-GI, ME-LGIM; X-series, X-DF, X-DF2.0 iCER |
| CMD (CSSC-MES Diesel) | Shanghai, Lingang | 2006 | MAN B&W, WinGD | Large bore (full range) | ME-C, ME-GI; X-DF2.0 iCER, X-DF-M |
| DMD (Dalian Marine Diesel) | Dalian, Liaoning | 1977 | MAN B&W, WinGD | Full two-stroke range | ME-C, ME-LGIM; X-series, X-S, X-DF, X-DF-M |
| YMD (Yichang Marine Diesel) | Yichang, Hubei | n/a (CSIC era) | MAN B&W, WinGD, J-ENG | 7,275 kW - 21.24 MW | Small-to-mid bore two-stroke |
| QMD (Qingdao Haixi Marine Diesel) | Qingdao, Shandong | 2006 | MAN B&W, WinGD, J-ENG | Up to 96 cm bore | Full two-stroke range |
| CMP (CSSC Marine Power) | Zhenjiang, Jiangsu | 1976 (as ZJMD) | MAN B&W (4-stroke), WinGD (2-stroke) | 400 kW - 19,020 kW | Medium-speed 4-stroke; auxiliary and genset |
DMD, YMD, and QMD now operate under the CSE (CSSC Engine) holding structure. HHM and CMD remain as stand-alone CSSC subsidiaries. CMP is a direct CSSC subsidiary focused on the four-stroke and medium-speed segment.
Alternative-fuel engine development
The most commercially visible dimension of CSSC’s engine-building activity since 2020 has been alternative-fuel variants, driven by IMO decarbonization targets and charterer pressure from major liner operators.
LNG dual-fuel (X-DF and ME-GI)
The WinGD X-DF platform, launched commercially in 2013, became the world’s best-selling low-pressure two-stroke dual-fuel engine by running-hours by 2023. The low-pressure fuel supply distinguishes it from the MAN B&W ME-GI, which operates at high-pressure gas injection. Both platforms are now in volume production at CSSC group facilities.
The X-DF2.0 with iCER technology reduces methane slip by approximately 50% compared to the first X-DF generation by using exhaust-gas recirculation to lower combustion-chamber oxygen concentration during gas-mode operation. CMD’s March 2023 delivery of the 9X92DF-2.0 iCER for CMA CGM was the first production unit of this variant. The WinGD X-DF dual-fuel architecture article covers the combustion-system design in detail.
For MAN B&W types, the ME-GI uses direct high-pressure gas injection. CSSC Engine delivered the world’s first 7S35ME-C9.7-GI+EcoEGR in 2023, filling a gap in the small-bore LNG dual-fuel spectrum. EcoEGR combines external gas recirculation with the GI platform to reduce NOx emissions below IMO Tier III limits without a separate SCR system.
Methanol dual-fuel (X-DF-M and ME-LGIM)
The MAN B&W ME-LGIM (Low pressure Gas Injection Methanol) platform was the first methanol-fuelled two-stroke series to enter commercial production. CSSC Engine’s DMD delivered China’s first methanol dual-fuel low-speed engine, the 6G50ME-C9.6-LGIM+EGRBP, on May 18, 2024. This was followed by the DMD delivery of the 7G80ME-C-LGIM-EGRTC for the world’s first methanol-powered VLCC (306,000 DWT, built at DSIC for China Merchants Energy Shipping) on July 4, 2025.
The WinGD X-DF-M platform, debuted by CMD’s February 2025 delivery of the 10X92DF-M-1.0-LPSCR (64,500 kW maximum, 10 cylinders, 92 cm bore), became the largest methanol dual-fuel engine built to date. The X-DF-M achieves a methanol replacement rate above 95% in methanol mode. With 56 X-DF-M engines on order across bore sizes from 52 to 92 cm, Chinese builders hold the dominant share of global methanol-engine production capacity.
Both the methanol and ammonia contexts are covered in the ammonia marine engines overview and methanol marine engines overview.
Ammonia (X-DF-A and ME-LGIA)
Ammonia dual-fuel two-stroke engines remain in the development and pilot-approval phase as of mid-2026. WinGD received an Approval in Principle (AIP) from China Classification Society (CCS) for the X-DF-A ammonia dual-fuel engine at Marintec China in December 2023. The AIP certificate was presented to “CSSC WinGD,” reflecting the ownership identity.
MAN Energy Solutions has been developing the ME-LGIA (Low pressure Gas Injection Ammonia) variant. CSSC group builders including HHM and CMD are participating in the manufacturing-readiness preparation for ammonia engines. Production deliveries of ammonia dual-fuel two-strokes are not yet reported from Chinese builders as of the publication date of this article, reflecting the slower commercialization pace of ammonia compared to methanol. The ammonia as marine fuel article documents the regulatory and safety framework that governs this timeline.
For the combustion-efficiency metrics applicable across all these fuel variants, the system main engine slow-speed two-stroke calculator and engine mean piston speed calculator give engineering context to the design differences between bore sizes and stroke ratios in the CSSC builder lineup.
Geographic and supply-chain structure
The six CSSC engine builders sit at the center of a supply chain that feeds the world’s largest shipbuilding group.
The Shanghai cluster (HHM and CMD) supplies the Yangtze-delta yards: Hudong-Zhonghua, Jiangnan, SWS, and smaller yards. The two facilities together account for the majority of CSSC’s large-bore two-stroke output and the entirety of the first-delivery milestones for the WinGD X-DF2.0 iCER and X-DF-M platforms.
DMD in Dalian supplies DSIC and the northern-China yards. Its co-location with DSIC mirrors the HHM/Hudong-Zhonghua pairing in Shanghai: the engine factory and the assembly yard share the same industrial waterfront, minimizing engine transport logistics.
YMD in Yichang serves Wuhan-area and Yangtze-corridor yards by river barge. QMD in Qingdao adds a second northern-China production base, covering the Shandong and Bohai Bay clusters.
CMP in Zhenjiang serves a different market: the medium-speed generator sets and auxiliary engines that every large ship requires in addition to its two-stroke main engine. Its 5,000-unit cumulative delivery history reflects decades of sustained four-stroke production volume.
The specific fuel oil consumption performance of engines built by these facilities is governed by the design-house specifications and type-approval test data filed with WinGD or MAN Energy Solutions. Individual builders can influence SFOC through manufacturing quality and shop-test calibration, but the design-point SFOC is set by the licensor.
Vertical integration within the CSSC group
No other shipbuilding group replicates CSSC’s vertical integration across design, production, and assembly for marine propulsion.
MAN Energy Solutions is not owned by any shipbuilder; its licensees in Korea (HHI-EMD, Hanwha Engine), Japan (Mitsui E&S DU, J-ENG), and elsewhere are all independent companies with arm’s-length license agreements. Wartsila, which designs and builds medium-speed engines in-house rather than licensing them to builders, is not affiliated with any shipbuilder.
Within CSSC, WinGD (design house, Switzerland) feeds engine designs to HHM, CMD, DMD, YMD, and QMD (production, China), whose output in turn equips the CSSC shipyards (Hudong-Zhonghua, Jiangnan, SWS, DSIC, and others). Royalties, technology-transfer agreements, and R&D investment all cycle within the same corporate group. When a new WinGD engine variant (such as the X-DF-A ammonia engine) reaches production readiness, CSSC can direct which of its factories produces the first units and can sequence the manufacturing ramp in alignment with its own shipyard order books.
This integration is structurally similar to the keiretsu models that historically linked Japanese engine builders (Mitsubishi, Kawasaki) to Japanese shipyards, but CSSC’s scale and the fact that it owns the design house outright rather than merely holding a license distinguish it from the Japanese model. The Mitsui E&S DU marine engines and HHI-EMD articles provide comparison cases.
China’s self-sufficiency drive and industrial policy
CSSC’s engine-building capacity grew in the context of explicit Chinese industrial policy aimed at reducing dependence on foreign propulsion technology.
In the late 1990s and early 2000s, Chinese yards building large vessels frequently sourced engines from Korean builders (HHI-EMD, Doosan) or from Japanese licensees (Mitsubishi, Mitsui) when domestic builders could not deliver to required specifications or timescales. The establishment of CMD (2006) and QMD (2006-2009) were partly responses to yard complaints about domestic engine lead times and quality consistency.
The 2008 Wartsila-CMD license agreement was negotiated at a time when CMD was still ramping up and needed the Wartsila technical support structure. By 2012, when the seven Chinese licensees renewed simultaneously, the Chinese builders were confident enough to negotiate as a collective block rather than individually.
WinGD’s acquisition in 2015-2016 moved the self-sufficiency strategy from production to design. China now sets the development roadmap for one of the two major slow-speed two-stroke engine families, alongside MAN Energy Solutions. The research and test facilities remain in Winterthur, and the engineering team is predominantly Swiss and European, but strategic decisions on which new engine variants to develop and when to commercialize them are made within a CSSC-owned corporate governance structure.
Market position and production volumes
China’s collective slow-speed two-stroke output (across all Chinese builders, not only CSSC group) reached approximately 30% of global production by kilowatt by the mid-2020s. CSSC group builders account for the dominant share of that Chinese output.
For comparison, Korean production (HHI-EMD and Hanwha Engine combined) accounts for roughly 35% of global output. Japanese production (Mitsui E&S DU, J-ENG/Kawasaki) accounts for approximately 10-15%. The remaining share is split among European builders and smaller Asian licensees.
The trajectory of Chinese share has been consistently upward: approximately 5% in 2000, 15% by 2010, 25% by 2020, and approximately 30% by 2024. This growth reflects Chinese yards capturing an increasing share of new-building orders and the domestic engine industry developing capacity to supply those yards rather than importing.
The CSE entity alone (DMD, YMD, QMD combined) crossed 4 million horsepower (approximately 2,983,000 kW) in annual output in 2023. HHM’s capacity exceeds a further 4 million horsepower. CMD’s capacity, while not officially published as a standalone figure, was projected above 2,200 MW (2.2 million kW) in its 2008 design specifications and has been expanded since.
Service and after-sales support
CSSC Marine Service Co., Ltd. (CMS) is the group’s after-sales service arm for two-stroke engines, supporting engines built across all CSSC group builders. CMS provides spare parts, technical service, and warranty support for CSSC-built MAN B&W and WinGD engines globally. It operates as a distinct legal entity within the CSSC group.
The service requirement for Chinese-built engines has grown as the fleet of CSSC-built ships ages. Ships delivered in 2010-2015 with CSSC-built main engines entered their first major overhaul cycles in the early 2020s. This created a demand for intermediate overhaul services, piston reconditioning, fuel-injection equipment refurbishment, and turbocharger work that CMS must cover.
WinGD, as the design house, maintains its own warranty and technical-support structure that applies to all WinGD-licensed engines globally, including those built at CSSC factories. The Wartsila service agreement (extended in January 2018 for 10 years) covers some legacy RT-flex and older Sulzer-branded engine types. This layered support structure means a Chinese-built WinGD engine can receive service from CMS (as the builder-affiliate service arm), from WinGD directly (for warranty and technical issues), or from Wartsila (for legacy pre-WinGD types under the extended agreement).
Limitations
Production-capacity figures for individual CSSC group engine builders change with order volume and facility investment; published figures for HHM, CMD, and CMP in particular are dated or incomplete in English-language sources, and official CSSC capacity disclosures are not consistently available in English. The figures cited in this article reflect the best available published data from trade publications and company announcements, not current engineering surveys.
Corporate structure within the CSSC group is subject to the ongoing post-merger integration that began in 2020 and is still active as of mid-2026. The 22.63 billion yuan diesel-engine consolidation announced in August 2022 had not been fully described in publicly available sources at the time of publication, and the precise scope of which assets transferred to which holding entity may differ from what is presented here.
Alternative-fuel engine production (methanol and ammonia in particular) is developing faster than any single published source can track. Delivery milestones for both the ME-LGIM and X-DF-M families advanced substantially between 2024 and mid-2025, and further deliveries occurred after the last sources consulted for this article.
The WinGD license model for non-Chinese builders (Korean, Japanese) involves commercial terms that are not disclosed. The assertion that CSSC benefits from intragroup WinGD royalties on its own Chinese production is an inference from the ownership structure; actual intercompany arrangements are confidential.
See also
- WinGD Corporate History
- MAN Energy Solutions Corporate History
- Marine Engine Makers: Global Hub
- HHI-EMD (Hyundai Heavy Industries Engine and Machinery Division)
- Hanwha Engine Corporate History
- Mitsui E&S DU Marine Engines
- Two-Stroke Marine Diesel Engine Fundamentals
- WinGD X-DF Dual-Fuel Architecture
- Methanol Marine Engines Overview
- Ammonia Marine Engines Overview
- Methanol as Marine Fuel
- Ammonia as Marine Fuel
- Specific Fuel Oil Consumption
- System: Main Engine (Slow-Speed Two-Stroke)
- Engine Brake Thermal Efficiency from SFOC
- Engine SFOC Sensitivity to Air Temperature
- Engine Mean Piston Speed