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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Cover [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol CYD
Entity Registrant Name CHINA YUCHAI INTERNATIONAL LTD
Entity Central Index Key 0000932695
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Current Reporting Status Yes
Entity Address, Country SG
Entity Filer Category Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Title of 12(b) Security Common Stock
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 40,858,290
Entity File Number 1-13522
ICFR Auditor Attestation Flag false