China Yuchai debuts pure ammonia truck engine

China Yuchai International, through its main subsidiary Guangxi Yuchai, has introduced its first high-pressure, direct-injection internal combustion engine that runs entirely on ammonia for heavy-duty commercial vehicles.

Rhea-AI Filing Summary

China Yuchai International, through its main subsidiary Guangxi Yuchai, has introduced its first high-pressure, direct-injection internal combustion engine that runs entirely on ammonia for heavy-duty commercial vehicles. The design integrates a high-pressure ammonia-to-hydrogen generation system with liquid ammonia direct injection and pre-chamber ignition.

The company states that this pure ammonia engine achieves thermal efficiency on par with top heavy-duty diesel engines while offering a zero-carbon power option for long-haul trucks. It is positioned alongside Yuchai’s broader low- and zero-carbon research in hydrogen, methanol and new energy powertrains.

Management highlights this technology as expanding Yuchai’s next-generation power solutions and supporting China’s “Dual Carbon” strategic goals. As context, in 2025 Yuchai sold 461,309 engines and generated revenue of RMB 24.6 billion.

Insights

Heavy-duty powertrain & ESG analyst

China Yuchai adds a zero-carbon ammonia engine to its portfolio, reinforcing long-haul decarbonization credentials.

China Yuchai International is highlighting a new high-pressure, direct-injection engine that operates entirely on ammonia for heavy-duty commercial vehicles. The company links this to low- and zero-carbon R&D across hydrogen, methanol and other new energy systems.

Ammonia propulsion could matter for long-haul fleets where batteries face range and weight limits. The engine is described as matching heavy-duty diesel thermal efficiency, which, if realized at scale, helps maintain operating economics while cutting carbon emissions.

The filing does not quantify commercialization timelines or volumes, so this is primarily a strategic technology signal rather than a near-term financial driver. Future disclosures on pilot deployments, customer adoption or regulatory incentives in China will help clarify the revenue impact relative to the 2025 base of RMB 24.6 billion.

Key Figures

Engines sold: 461,309 engines Annual revenue: RMB 24.6 billion Founding year: 1951

3 metrics

Engines sold 461,309 engines Yuchai engine sales in 2025

Annual revenue RMB 24.6 billion Yuchai total revenue in 2025

Founding year 1951 Year Guangxi Yuchai was founded

Key Terms

high-pressure, direct-injection internal combustion engine, pure ammonia internal combustion engine, thermal efficiency, Dual Carbon strategic goals, +1 more

5 terms

high-pressure, direct-injection internal combustion engine technical

"introduced its first high‑pressure, direct‑injection internal combustion engine"

pure ammonia internal combustion engine technical

"pure Ammonia Internal Combustion Engine For Heavy-Duty Commercial Vehicles"

thermal efficiency technical

"With a thermal efficiency on par with the highest levels of heavy-duty diesel engines"

Thermal efficiency measures how well a device or system converts heat energy into useful work or output, expressed as a percentage of the input heat that becomes productive output rather than wasted as excess heat. Think of it like a car’s fuel mileage: higher thermal efficiency means you get more useful work from the same fuel. Investors care because higher thermal efficiency lowers operating costs, improves profit margins, reduces fuel or energy needs, and can signal competitive advantage or lower regulatory and capital risks.

Dual Carbon strategic goals regulatory

"helping China achieve its ‘Dual Carbon’ strategic goals"

forward-looking statements regulatory

"This news release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995"

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did China Yuchai (CYD) announce in this Form 6-K?

China Yuchai announced a new high-pressure, direct-injection internal combustion engine that runs entirely on ammonia for heavy-duty commercial vehicles. The company positions it as a zero-carbon solution with thermal efficiency comparable to leading heavy-duty diesel engines and part of its broader low-carbon technology roadmap.

How does China Yuchai’s new pure ammonia engine work for heavy-duty vehicles?

The new engine integrates a high-pressure ammonia-to-hydrogen generation system with high-pressure liquid ammonia direct injection ignited through a pre-chamber jet. This configuration is designed to deliver thermal efficiency at levels similar to heavy-duty diesel engines while using ammonia as a zero-carbon fuel for long-haul trucks.

Why is the ammonia engine important for China Yuchai (CYD) and decarbonization?

China Yuchai describes the ammonia engine as a historic breakthrough in its low- and zero-carbon research. It broadens the company’s next-generation power solutions, supports China’s "Dual Carbon" strategic goals and provides an alternative to traditional diesel engines for heavy-duty, long-haul commercial vehicle applications.

What other powertrain technologies does China Yuchai (CYD) develop besides ammonia engines?

China Yuchai, through Guangxi Yuchai, offers diesel and natural gas engines plus alternative and new energy products. These include hydrogen- and methanol-based systems, pure electric powertrains, range extenders, hybrid solutions and fuel cell systems, all serving trucks, buses, construction, agriculture, marine and power generation markets.

How large is China Yuchai’s core engine business based on recent figures?

In 2025, Guangxi Yuchai sold 461,309 engines and recorded revenue of RMB 24.6 billion. These figures show a sizable existing engine business, providing context for how future low- and zero-carbon technologies, such as the pure ammonia engine, may fit into the company’s broader powertrain portfolio.

What forward-looking risks does China Yuchai (CYD) highlight in this release?

China Yuchai includes a standard forward-looking statement warning that expectations about operations and financial performance may differ due to factors like regulation, competition, and political or economic conditions. It refers readers to risk discussions in its Form 20-F and other SEC reports for more detail.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 06:06 AM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

May 14, 2026

(Commission File No. 1 - 13522)

CHINA YUCHAI INTERNATIONAL LIMITED

(Translation of registrant’s name into English)

16 Raffles Quay #26-00

Hong Leong Building

Singapore 048581

(Address of registrant’s principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  Form 40-F 

EXHIBIT INDEX

Exhibit	Description
99.1	Press release dated May 14, 2026 – Yuchai Introduces Its First High-Pressure, Direct-Injection Pure Ammonia Internal Combustion Engine For Heavy-Duty Commercial Vehicles

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

China Yuchai International Limited
(Registrant)
By:	/s/ Weng Ming Hoh
Name:	Weng Ming Hoh
Title:	President and Director

Date: May 14, 2026

Exhibit 99.1

Yuchai Introduces Its First High-Pressure, Direct-Injection Pure Ammonia Internal Combustion Engine For Heavy-Duty Commercial Vehicles

Singapore, May 14, 2026 – China Yuchai International Limited (NYSE: CYD)(“China Yuchai International” or the “Company”), one of the largest powertrain solution manufacturers through its main operating subsidiary in China, Guangxi Yuchai Machinery Company Limited (“Yuchai”), today introduced its first high‑pressure, direct‑injection internal combustion engine capable of operating entirely on ammonia and designedfor heavy‑duty commercial vehicles.

This is a historic breakthrough for Yuchai in its low- and zero-carbon power research initiatives in hydrogen-, methanol-, and now, ammonia-based propulsion. This milestone validates and operationalizes key technologies; specifically the integration of a high-pressure ammonia-to-hydrogen generation system with the high-pressure direct injection of liquid ammonia ignited via a pre-chamber jet.

With a thermal efficiency on par with the highest levels of heavy-duty diesel engines, this technology delivers a new zero-carbon power solution for heavy-duty, long-haul commercial vehicles. This innovation effectively balances the advantages of low total lifecycle costs with the need to reduce carbon emissions, facilitating the transition from traditional internal combustion engines toward a sustainable, zero-carbon future.

Weng Ming Hoh, President of China Yuchai International, commented, “This breakthrough meaningfully broadens our technology foundation and the next‑generation power solutions we provide, unlocking significant potential for carbon reductions. Building on this momentum, Yuchai will further strengthen its innovative R&D capabilities in ammonia‑energy applications, reinforcing our commitment to helping China achieve its ‘Dual Carbon’ strategic goals.”

About China Yuchai International

China Yuchai International, through its principal operating subsidiary, Guangxi Yuchai Machinery Company Limited (“Yuchai”), is one of the leading powertrain solutions manufacturers in China. Founded in 1951, Yuchai maintains a reputable brand name, a strong research and development team, and a significant market share in China. Yuchai specializes in the design, manufacture, and sale of light-, medium- and heavy-duty engines for trucks, buses, pickups, construction and agricultural equipment, and marine and power generation applications. It delivers a comprehensive portfolio of powertrain solutions, spanning traditional diesel and natural gas engines to alternate fuels and new energy products, including pure electric, range extenders, hybrid, and fuel cell systems. Through an extensive network of regional sales offices and authorized customer service centers, Yuchai distributes engines directly to auto OEMs and distributors while providing after-sales services across China and globally. In 2025, Yuchai sold 461,309 engines and reported total revenue of RMB 24.6 billion. For more information, please visit http://www.cyilimited.com.

Safe Harbor Statement:

This news release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The words "believe", "expect", "anticipate", "project", "targets", "optimistic", "confident that", "continue to", "predict", "intend", "aim", "will" or similar expressions are intended to identify forward-looking statements. All statements other than statements of historical fact are statements that may be deemed forward-looking statements. These forward-looking statements, including, but not limited to, statements concerning China Yuchai's and the joint venture's operations, financial performance and condition, are based on current expectations, beliefs and assumptions which are subject to change at any time. China Yuchai cautions that these statements by their nature involve risks and uncertainties, and actual results may differ materially depending on a variety of important factors such as government and stock exchange regulations, competition, political, economic and social conditions around the world and in China, including those discussed in China Yuchai's Form 20-Fs under the headings "Risk Factors", "Results of Operations" and "Business Overview" and other reports filed with the Securities and Exchange Commission from time to time. All forward-looking statements are applicable only as of the date they are made and China Yuchai specifically disclaims any obligation to maintain or update the forward-looking information, whether of the nature contained in this release or otherwise, in the future.

For more information:

Investor Relations

Kevin Theiss

Tel: +1-212-510-8922

Email: cyd@bluefocus.com

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 13.8 KB