UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13D

Under the Securities Exchange Act of 1934

(Amendment No. 18)*

China Yuchai International Limited

(Name of Issuer)

Common Stock, Par Value $0.10 Per Share

(Title of Class of Securities)

G210821050

(CUSIP Number)

Ms. Leong Sook Han

Chief Financial Officer

Hong Leong Asia Ltd.

16 Raffles Quay

#26-00 Hong Leong Building

Singapore 048581

65-62208411

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 29, 2018

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box.  ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

This Amendment No. 18 amends the Schedule 13D previously filed with the Securities and Exchange Commission by Hong Leong Asia Ltd. on June 19, 1995, as amended by Amendment No. 1 to Schedule 13D filed on February 17, 1998, as subsequently amended and restated by Amendment No. 2 to Schedule 13D filed on July 19, 2002, as further amended by Amendment No. 3 to Schedule 13D filed on September 10, 2003, as further amended by Amendment No. 4 to Schedule 13D filed on October 7, 2003, as further amended by Amendment No. 5 to Schedule 13D filed on October 15, 2003, as further amended by Amendment No. 6 to Schedule 13D filed on November 28, 2003, as further amended by Amendment No. 7 to Schedule 13D filed on October 27, 2009, as further amended by Amendment No. 8 to Schedule 13D filed on October 28, 2009, as further amended by Amendment No. 9 to Schedule 13D filed on August 30, 2010, as further amended by Amendment No. 10 to Schedule 13D filed on May 25, 2011, as further amended by Amendment No. 11 to Schedule 13D filed on June 7, 2011, as further amended by Amendment No. 12 to Schedule 13D filed on August 12, 2011, as further amended by Amendment No. 13 to Schedule 13D filed on August 23, 2011, as further amended by Amendment No. 14 to Schedule 13D filed on November 22, 2011, as further amended by Amendment No. 15 to Schedule 13D filed on July 14, 2014, as further amended by Amendment No. 16 to Schedule 13D filed on July 16, 2015 and as further amended by Amendment No. 17 to Schedule 13D filed on July 5, 2016 (as so amended, the “Statement”) with respect to the common stock, par value US$0.10 per share (the “Common Stock”), of China Yuchai International Limited, a Bermuda corporation (“CYI”). Capitalized terms used but not defined herein have the meanings given to them in the Statement.

Schedule 1 referred to in Item 2 is hereby amended and restated in its entirety by Schedule 1 hereto.

The first and second sentences of Item 4 of the Statement are hereby amended and restated in their entirety as follows:

Of the 16,960,845 shares of Common Stock covered by this Statement, 9,520,251 are owned of record by HLT, and in addition HLT holds the Special Share described in Item 6 of Amendment No. 2 to Schedule 13D filed with the Securities and Exchange Commission on July 19, 2002. The remaining 7,440,594 shares of Common Stock covered by this Statement are owned of record by Well Summit.

Items 5(a) and (b) of the Schedule are hereby amended and restated in their entirety as follows:

(a) and (b) As of November 29, 2018, each of the Reporting Persons beneficially owns the number and percentage of shares of Common Stock of CYI issued and outstanding listed opposite its name:

Note:

HLT owns of record 9,520,251 shares of Common Stock, which represents 23.3% of the 40,858,290 shares of Common Stock of CYI issued and outstanding as of November 29, 2018, based on information provided by CYI. HLT also holds the Special Share described in Item 6 of Amendment No. 2 to Schedule 13D filed with the Securities and Exchange Commission on July 19, 2002.

Well Summit owns of record 7,440,594 shares of Common Stock, which represents 18.2% of the 40,858,290 shares of Common Stock of CYI issued and outstanding as of November 29, 2018, based on information provided by CYI.

HLC has an indirect interest in the 9,520,251 shares of Common Stock directly owned by HLT, which represents 23.3% of the 40,858,290 shares of Common Stock of CYI issued and outstanding as of November 29, 2018, based on information provided by CYI.

The 16,960,845 shares of Common Stock beneficially owned by HLA represents 41.5% of the 40,858,290 shares of Common Stock of CYI issued and outstanding as of November 29, 2018, based on information provided by CYI.

Shares held of record by HLT: HLT (together with HLC by virtue of its ownership of HLT and HLA by virtue of its ownership of HLC) has shared voting and dispositive power over the 9,520,251 shares of Common Stock owned by HLT and the Special Share described in Item 6 of Amendment No. 2 to Schedule 13D filed with the Securities and Exchange Commission on July 19, 2002.

Shares held of record by Well Summit: Well Summit (together with HLA by virtue of its ownership of Well Summit) has shared voting and dispositive power over the 7,440,594 shares of Common Stock owned by Well Summit.

Item 5(c) of the Schedule is hereby amended as follows:

Well Summit has effected the following purchase of shares of Common Stock during the 60 days prior to the date hereof:

Except as set forth above, none of the Reporting Persons have effected any transaction in shares of Common Stock during the past 60 days.

SIGNATURE

After reasonable inquiry and to the best of his or her knowledge and belief, each of the undersigned certifies that the information in this statement is true, complete and correct.

Exhibit Index

Page 10 of 12

SCHEDULE I

The following is a list of the directors and executive officers of the Reporting Persons:

DIRECTORS AND EXECUTIVE OFFICERS

OF WELL SUMMIT INVESTMENTS LIMITED

Executive Officers

Nil

DIRECTORS AND EXECUTIVE OFFICERS

OF HL TECHNOLOGY SYSTEMS PTE LTD

Executive Officers

Nil

Page 11 of 12

DIRECTORS AND EXECUTIVE OFFICERS

OF HONG LEONG (CHINA) LIMITED

Executive Officers

Nil

Page 12 of 12

DIRECTORS AND EXECUTIVE OFFICERS

OF HONG LEONG ASIA LTD.