ENVALITH
株式会社ジャパンエンジンコーポレーション logo

Japan Engine Corporation

6016・Standard Market・Transportation Equipment

Official website
株式会社ジャパンエンジンコーポレーション logo
Japan Engine Corporation6016

Business

Japan Engine Corporation is a specialized manufacturer of marine internal combustion engines (main engines) with a history dating back to its founding in 1910. Building on Mitsubishi UE diesel engine technology, the company has established an integrated system spanning development, design, manufacturing, sales, and after-sales service, with domestic and overseas shipyards and shipowners as its primary customers. The business consists of two segments: manufacturing and sales of marine internal combustion engines, and repairs and parts, etc. (After-Sales Service, License Business, and parts supply), and the company promotes the global spread of UE engines through technology licensing to overseas licensees. For FY2026 (ending March 2026), net sales are expected to reach ¥29,707 million, with an order backlog of ¥34,454 million.

Business Model

The company secures initial revenue from the manufacture and sale of main engines (Marine Main Engines (LSH Series), etc.) while building up stock-type revenue by continuously capturing maintenance parts and repair demand as the number of operating vessels increases. In addition, royalty income from technology licensing to overseas licensees and the parts supply business are expanding globally. In FY2026 (ending March 2026), sales of repairs and parts, etc. reached ¥15,536 million, accounting for 52.3% of the total, surpassing main engine sales.

Company Strengths

As a global licensor maintaining an integrated in-house system covering development, design, manufacturing, sales, and after-sales service, the company has built an ecosystem for the UE Engine that includes overseas licensees. In December 2022, the company achieved cumulative UE diesel engine production of 40 million horsepower, and its long-accumulated technology and track record make short-term imitation by competitors difficult.

With support from the NEDO Green Innovation Fund project, the company completed the world's first unit of the 50LSJA engine (ammonia) ahead of competitors and completed delivery in October 2025. Verification operation of the hydrogen fuel engine (35LSGH) also began in March 2026, establishing the company's first-mover position in the next-generation decarbonized engine field.

The order backlog at the end of FY2026 (ending March 2026) reached ¥34,454 million (+25.9% year on year), with marine internal combustion engines alone securing ¥26,659 million. The company has already obtained informal notifications from shipyards regarding production allocation for approximately the next three years, and the accumulation of orders based on its own sales and production management capabilities secures visibility into medium-term revenue.

ENVALITH's Perspective

In FY2026 (ending March 2026), net sales reached ¥29,707 million and net income attributable to owners of parent reached ¥4,758 million, marking a record high for the third consecutive period. However, sales of Marine Internal Combustion Engines fell sharply to ¥14,170 million (down 15.6% year on year). The main cause was operational load adjustment due to production of the first unit of the ammonia/hydrogen fuel engine, which is considered a temporary factor, but the sharp decline in cash flows from operating activities from ¥6,750 million to ¥2,551 million warrants close attention. Confirmation is also needed regarding the continuity and scale of NEDO subsidies (totaling approximately ¥1,700 million), which are a factor boosting ordinary income.

In FY2026 (ending March 2026), the two major customers were Guangzhou Diesel Engine Factory Co., Ltd. (¥4,294 million) and Oshima Shipbuilding Co., Ltd. (¥4,146 million), together accounting for approximately 28% of total net sales. In the previous period, Namura Shipbuilding Co., Ltd. ranked first (¥8,321 million), but it is no longer subject to disclosure in the current period, indicating a shift in the customer composition. While the expansion of sales to overseas licensees is promoting geographic diversification, the rising proportion of sales to China (Asia sales of ¥5,922 million, of which ¥5,324 million was to China) is increasing sensitivity to geopolitical risk.

The earnings forecast for FY2027 (ending March 2027) calls for net sales of ¥32,700 million (up 10.1%), operating income of ¥5,880 million (up 7.7%), and net income attributable to owners of parent of ¥5,010 million (up 5.3%), planning for a record high for the fourth consecutive period. The operational load adjustment is expected to be resolved as verification operation of the first unit of the hydrogen fuel engine is completed and delivered, leading to a recovery in main engine sales. On the other hand, due to the continued high level of R&D investment for the simultaneous parallel development of decarbonized, low-carbon, and heavy fuel oil engines, and ongoing capital expenditures associated with the construction of a new plant scheduled to begin operation in FY2028 (construction in progress of ¥909 million), the net sales operating margin is expected to decline slightly from 18.4% to around 18.0%.

Growth Strategy

Achieving mid-to-long-term production capacity expansion through advanced development of decarbonized engines, expansion of UE Engine global market share, and construction of a new plant

The first unit of the 50LSJA engine (ammonia) was completed and delivered in October 2025, a world first. Following construction and sea trials at shipyards, the vessel equipped with this engine is scheduled to enter service during FY2027 (ending March 2027). With support from the NEDO Green Innovation Fund, development of the 60LSJA engine (ammonia) is also proceeding in parallel.

In-house verification test operation of the first unit of the 35LSGH engine (hydrogen) commenced in March 2026. Verification operation is scheduled to be completed and the unit delivered to a shipyard during FY2027 (ending March 2027). Upon completion, the operational load adjustment associated with manufacturing of Next-Generation Decarbonized Fuel Engines (Ammonia/Hydrogen) is expected to be progressively resolved, leading to a recovery in the number of Marine Main Engines (LSH Series) produced.

The 50LSJM engine is under development as a low-carbon fuel engine that contributes to GHG reduction and reduction of SOx/NOx emissions. The company plans to bring it to market in a short period by leveraging know-how accumulated through development of decarbonized and heavy fuel oil engines, thereby establishing a full lineup covering decarbonized, low-carbon, and heavy fuel oil options.

The new plant of the leading Chinese licensee, completed in the previous fiscal year, is gradually increasing its production volume. The company is strengthening after-sales service support for main engines manufactured by overseas licensees in collaboration with J-ENG Shanghai (its local subsidiary in China). Sales to Guangzhou Diesel Engine Factory Co., Ltd. rose 48% year on year to ¥4,294 million, making it the top customer.

A new plant is under construction to efficiently produce engines for the volume zone of vessels, including the 60LSH engine (heavy fuel oil) and 60LSJA engine (ammonia). The plant is scheduled to commence operation in FY2028, after which further increases in orders are planned. Construction in progress stood at ¥909 million as of the end of FY2026 (ending March 2026).

Last updated: July 19, 2026